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310-813 - Sun Certified MySQL 5.0 Developer Part(R) II - BrainDump Information

Vendor Name : SUN
Exam Code : 310-813
Exam Name : Sun Certified MySQL 5.0 Developer Part(R) II
Questions and Answers : 70 Q & A
Updated On : November 16, 2018
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310-813 exam Dumps Source : Sun Certified MySQL 5.0 Developer Part(R) II

Test Code : 310-813
Test Name : Sun Certified MySQL 5.0 Developer Part(R) II
Vendor Name : SUN
Q&A : 70 Real Questions

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SUN SUN Sun Certified MySQL

solar Plans Open source buying Spree, Completes MySQL Deal | killexams.com Real Questions and Pass4sure dumps

news

sun Plans Open supply buying Spree, Completes MySQL Deal solar Microsystems nowadays talked about it has completed its $1 billion acquisition of open supply database supplier MySQL and may circulate aggressively to purchase other open supply carriers.

whereas no selected aims were stated, sun President and CEO Jonathan Schwartz stated the MySQL acquisition may be a key part in solar's effort to transform itself into a key provider of open source utility.

"Open source is definitely within the DNA of sun," Schwartz said. "As such, once we seem to be across the market, these corporations that have constructed good, high-integrity communities and have large distribution and a few measure of commercial success are the ones we're going to be most attracted to."

just ultimate week, sun introduced the completion of an extra open supply vendor, Innotek, whose VirtualBox desktop virtualization platform works cross-customer operating techniques.

"there may be a transforming into number of totally interesting and totally resourceful open supply organizations available and we trust we are a herbal domestic for lots of them and we're actually going to be placing our stability sheet to work to head make that the case," Schwartz referred to.

regardless of sun's moves to place itself as a key open source issuer by way of OpenSolaris, Java, NetBeans and its GlassFish software server residences, business officials stated gaining MySQL will let solar tap into MySQL's stated 11 million subscribers whereas giving credence to MySQL as an option database platform to business shoppers.

"MySQL is among the most beneficial manufacturers in the free and open source delicate world," mentioned wealthy green, government vp of solar's application company. "This combination strengthens solar's position because the greatest contributor to the open supply neighborhood and offers solar a dramatically more desirable attain."

sun first introduced its intent to acquire MySQL in mid-January and spoke of both organizations moved directly to close the deal. MySQL CEO Marten Mickos will reside on with solar as senior vice chairman of the enterprise's new database neighborhood.

solar also moved without delay to transition the MySQL product line. The business talked about clients can download the database freed from charge right here. commercial enterprise consumers can now subscribe to MySQL's complete product line. sun referred to it's offering trial subscriptions freed from can charge.

The company additionally launched MySQL enterprise unlimited , a subscription-based provider for the deployment and management of any variety of MySQL business Servers.

concerning the writer

Jeffrey Schwartz is editor of Redmond journal and also covers cloud computing for Virtualization overview's Cloud report. moreover, he writes the Channeling the Cloud column for Redmond Channel partner. follow him on Twitter @JeffreySchwartz.


sun Basket offers Meal Kits in keeping with American melanoma Society instructions | killexams.com Real Questions and Pass4sure dumps

published: Mon, November 5, 2018 1:27 PM

solar Basket has launched meal kits that meet the American cancer Society's dietary guidelines. The company says the ACS recommends a eating regimen high in greens, fruits, entire grains, and lean proteins however low in purple and processed meat. sun Basket is offering plant-forward vegan, vegetarian, and pescatarian plans for those seeking to consume by way of these requisites.

govt Chef Justine Kelly, the former head chef on the Slanted Door, a James Beard Award-winning restaurant, created the plans, which offer nutritionally balanced nutrition with globally impressed flavors. And the products are made with organic produce and clean materials.

The enterprise notes that here's one of a couple of health-oriented improvements. different initiatives consist of partnering with the American Diabetes affiliation on a diabetes-pleasant meal plan and offering coronary heart-determine licensed recipes that meet American coronary heart association requisites. 

linked: sun Basket Opens Distribution center in a Missouri Cave; sun Basket Opens New Distribution center.

NewsOK has disabled the comments for this article.


Renesas Electronics Sub-Gigahertz instant solution selected as standard look at various bed Unit for Wi-solar FAN | killexams.com Real Questions and Pass4sure dumps

with the aid of Ken Briodagh November 07, 2018

based on a contemporary announcement, Wi-sun Alliance has adopted the Renesas Electronics supplier, a employer of superior semiconductor options, sub-gigahertz (Sub-G) instant answer as a candidate of the interoperability verify mattress units (TBUs) for the Wi-sun FAN (container area network) Certification program.

Renesas is a component of the primary wave of groups taking part in the Wi-solar FAN 1.0 certification method with its RAA604S00/RX651 instant solution. Certifications are deliberate by means of the end of 2018.

The Sub-G instant solution points Tessera technology’s contrast platform, which contains an assessment board3 hooked up with Renesas’ RAA604S00 instant communications device-on-chip (SoC) and RX651 microcontroller (MCU), in addition to communication control software offered through Renesas. Renesas will show the new Sub-G instant answer at its booth (stand B.c44) at European Utility Week 2018, November 6 to November eight, in Vienna, Austria.

“The Wi-sun neighborhood has been making large strides within the building and deployment of instant communications in the energy administration programs trade, and we are pleased to expand our commitment to the wise energy markets and boost the newest Wi-solar requirements with our Wi-sun FAN-licensed answer and test mattress units,” mentioned Akihiro Kuroda, VP, power Infrastructure enterprise Division, Renesas Electronics company.

The Sub-G band offers elements which are resilient to physical limitations and might transmit facts even further than supported by using past specifications, even in city environments. considering broad areas may also be covered with respectable steadiness via mesh networks, it is acceptable for applications such sensible meter conversation, energy utilization visualization, monitoring device utilization, and managing quite a lot of sensors inside a utility, factories and structures.

The IoT Evolution Expo, and collocated hobbies, IoT Evolution fitness, LPWAN Expo, The wise metropolis event, and IIoT convention, will take location Jan. 29 to Feb 1 in ft. Lauderdale, Florida. talk over with IoTEvolutionExpo.com to register now.

Edited via Ken Briodagh

author data

Editorial Director




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310-813 exam Dumps Source : Sun Certified MySQL 5.0 Developer Part(R) II

Test Code : 310-813
Test Name : Sun Certified MySQL 5.0 Developer Part(R) II
Vendor Name : SUN
Q&A : 70 Real Questions

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Exploring Enums: The Wait Is Finally Over | killexams.com real questions and Pass4sure dumps

To enumerate means to itemize or to list. In the world of programming, enumerations, enums for short, are used to represent a finite set of values (constants) that a variable can attain. In other words, it defines the domain of a type. For instance, different states of a fan switch - off, low, medium, and high - make up an enumeration.

Since the first release of Java, programmers have been complaining about the lack of core language support for enumerated types. After all, Java improvised on the shortcomings of C++ and touted type safety, so it was only natural for the developer community to expect support for a true enum-type. During what seemed like an eternally long wait, many ad-hoc enum representations evolved and most of them shared a common premise - modeling enumerations based on a primitive type, usually an int; see Listing 1 for an example.

Although practical, such implementations have long been frowned upon by Java purists as a hack that can best be described as brittle. What exactly is wrong with such an implementation? In essence, the main disadvantage of faking enumerated types using primitives is the lack of strong typing and hence the inability to catch errors at compile time. Other shortcomings are less readable code, deviations from object-oriented concepts such as encapsulation, the absence of a namespace requiring an explicit prefix for all references, and the dangers of exposing the internal implementation to client code.

Let's look at some of these drawbacks in more detail.

Loose type checking is the result of a compiler treating the faked enumeration just like any other primitive variable. Since the compiler doesn't know anything about the cohesiveness of the enumeration of constant values, it doesn't catch, for instance, a definitive assignment of an out of range value. In other words, lack of an explicit type totally gives away the benefits of compile-time error detection.

Such ad hoc approaches violate some of the basic object-oriented principles. In the previous example, the states of the switch lack encapsulation. Attributes representing the constants and operations are not grouped together but are scattered within the enclosing scope. Since the client code is well aware of implementation details, even a small change such as renumbering them might result in broken client code. Also note the lack of explicit scoping. Since enum attributes are listed along with other class attributes, the enclosing scope is often that of the declaring class or interface. This makes their grouping vague, unreadable, and sometimes error prone.

In his book Effective Java, Joshua Bloch presents a pattern for type-safe enums that offers both compile-time safety and better encapsulation. java.awt.Color uses a similar strategy to hide the int-enum implementation under the sheet. However, after reading through pages full of Java code, you begin to wonder if the juice is worth the squeeze. It only reinforces the need for core language support for enum types. For a language that touts type safety, the idea of faking enums with such elaborate pyrotechnics seems rather odd.

Enter the New EnumThe wait is finally over and true enums are here. Enums are a type of their own in J2SE 5.0. Among many other developer-friendly features recommended in JSR 176, Tiger (the code name for the new release) packs the powerful punch of type-safe enums. Listing 2 shows how we rewrite Fan.java using true enums. (Listings 2-9 can be downloaded from www.sys-con.com/java/sourcec.cfm.)

Note the new enum keyword introduced to support the new type and also how enumerated constants are listed - they are neither strings nor ints but belong to their own declared type, i.e., SwitchState. Because it's a true type, all the benefits of strong typing automatically kick in. For instance, the following code attempting to set an invalid state

new Fan().setState(6);

is automatically detected at compile time and reported an error, eliminating the need for several lines of validation code:

setState(Fan.SwitchState) in Fan cannot be applied to (int)

Let's look at other useful features provided by the enum type.

Support for NamespaceIn the previous example, all the listed constants, e.g., states of the fan switch, implicitly belong to the enclosing type, appropriately named SwitchState, requiring an explicit namespace qualification to all references to states. For example:

SwitchState.Low

Namespace adornment also helps avoid collisions. If we were to declare another enum type for class Fan using a similar set of constants, say:

public enum DurabilityRating { Low, Medium, High }

it will result in no name collision. SwitchState.Low can be distinguished from DurabilityRating.Low because of their enclosing scope.

Since enum SwitchState is declared as public, and with the type system providing a namespace for each enum constant, it can be accessed outside the scope of class Fan just like any normal attribute reference, e.g., Fan.SwitchState.Medium.

Auto Conversion to String ValuesThe new enum type easily facilitates descriptive printing using an internal implementation of the toString() method. The default implementation returns a string representation of the constant as declared, and, if you don't like it, it can be changed by overriding toString(). It's that simple.

Works with Programming ConstructsSince enums are their own types, some of the standard Java constructs, notably the switch and for statements, have been enhanced to work with enum types. Listing 3 provides an example of the switch construct.

Switch statements are useful for simulating the addition of a method to an enum type from outside the type. This can be very useful if for some reason the enum definition cannot be modified, but needs to be extended.

There is something rather interesting about this switch statement - note how the enum constants in case statements appear bare, e.g., unqualified with their namespace. J2SE 5.0 makes life easier by attempting to resolve identifiers in the immediate context. This is somewhat similar to the new static imports feature. In this example, however, you are required to omit the namespace. Try including it and you'll get an error message:

Fan.java:16: an enum switch case label must be the unqualified name of an enumeration constant case SwitchState.Off : return SwitchState.Low ;

Listing 4 provides an example that uses a for-loop construct to iterate through enums.

The values() method returns an array that contains enum constants for this enum in the order in which they are declared. By the way, the for-loop shown here is called "enhanced for-loop", another neat feature in the new release. They are also called as "for-in loop" since you read them as "for-state-in-Switchstate.values". This new construct simplifies iterating over a collection of values - both arrays and Java collections - by taking away the need to inspect the size, use a temporary index variable, and cast each element to the appropriate type.

Looking Under the HoodIn the spirit of empiricism, let's look under the hood and see how enums are implemented. Compiling Fan.java (for the complete source code see the resources section) generates two .classes: Fan.class and Fan$SwitchState.class. The latter contains our enum definition.

D:\MyJava\JDJ\src>javap Fan$SwitchState Compiled from "Fan.java" public final class Fan$SwitchState extends java.lang.Enum{ public static final Fan$SwitchState Off; public static final Fan$SwitchState Low; public static final Fan$SwitchState Medium; public static final Fan$SwitchState High; public static final Fan$SwitchState[] values(); public static Fan$SwitchState valueOf(java.lang.String); static {}; }

As you can see, the process of compilation results in the automatic generation of a new class that extends java.lang.Enum. In other words, the enum keyword acts as a shorthand representation for the autogenerated class. This is what the authors of JSR 201 meant by "linguistic support for type-safe enumeration pattern." It's worth mentioning that every new language extension introduced in Java 5.0 is implemented by modifying the source-to-byte code compiler so the JVM implementation remains unchanged.

If you notice the naming convention adopted for generated enum types, you'll recognize that they closely resemble the inner class syntax, e.g., <enclosingType>$<thisType> format. All enum classes are final subclasses of java.lang.Enum, serializable, and comparable. They come with predefined toString, hashCode, and equals methods. All methods except toString are final.

Note that all enlisted enum constants are represented as final self-type variables of the class. This is done to ensure no instances exist other than those in the generated class. In other words, enums are Singletons and, for the same reason, they can't be instantiated using new or cloned. The clone method in java.lang.Enum throws a CloneNotSupportedException.

Since enums are compiled into their own class files, their definition can be changed, e.g., enum constants can be added, deleted, and reordered without having to recompile the clients. If you removed an enum constant that a client is using, you'll fail fast with an error message.

Now let's look at some advanced features.

Flavors of DeclarationEnums can be declared in various flavors. The enum FanState above is an example of an inline declaration. These are useful for defining enums that have a limited scope - the use and throw type of enums. Since Java 5.0 introduces the keyword enum at the same level as class and interface keywords, enums can be declared just as you would a new class or an interface - in its own .java file (see Listing 5).

Normal rules of access visibility that apply to standalone Java classes also apply to enums, whether they are declared inline or in a separate file. For example, if you omitted the public keyword, the enum type will have the default package visibility and hence be accessible only within the package. Similarly if the SwitchState enum were to have a private access specifier, it wouldn't be accessible outside the class scope of Fan. You get the point.

As with other new features introduced in Java 5.0 such as generics, enums have been used in several JDK packages. JDK 5.0 includes several enum types to support core classes. For instance, the newly introduced java.lang.Thread class uses an enum named State to represent the current state of the thread. Some of the best enum candidates haven't been converted over yet - like the most quoted Color class. You can use Javadoc as your field guide for spotting enums in Tigerland. The new API Javadoc conveniently lists all enums in the package-summary.html along with other top-level types. Once you have spotted them, go ahead and open the source code and see how the preachers practice. It's always fun.

Class-like BehaviorSince enums are class-like critters, they support most, if not all (see the Caveat Emptor sidebar), semantics supported by normal Java classes. The enum type definition can have one or more parameterized constructors, implement interfaces, and support class body elements such as attributes, methods, instance and static initializer blocks, and even inner classes.

In addition, arbitrary fields and methods can be added to individual enum constants. Such constant-specific class bodies define anonymous classes inside enum classes that extend the enclosing enum class. Listings 6-9 illustrate the use of some of these features.

There's a lot to digest here, so let's tackle them one at a time.

We are defining three types of accounts as enums - checking, savings, and investment. First things first - we need some clarification of terminology here. Every enum constant has a declaring class, which is also called its type. The term "enum type" is used to refer to the declaring class, e.g., AccountType. When we use the term "enum constant", it's referring to all enlisted contents contained in the scope of AccountType, e.g., Checking, Savings, and Investment. It shouldn't be very confusing. Just think of any class declaration and its objects - the enum type is analogous to the class declaration and enum constants, the objects.

Enums Are ClassesSimilarities between a normal class declaration and an enum declaration are hard to miss. The enum type AccountType implements the IAccountType interface and has two constructors. What does it mean? To implement an interface, the enum type must implement every method defined in the interface. Since all enum constants are objects of the declared type, they share the common implementation of methods getAvgBalanceMethod and getInterest- Rate. An enum constant declaration, when followed by arguments, invokes the constructor defined by the enum type. In our example, the enum constant Savings invokes the constructor

AccountType(double interestRate)

with argument 3.5.

All the standard rules of constructor overloading and selection specified by the Java Language Specification are followed here. Since enum constant Checking has no arguments following its declaration, it's necessary to provide a no-arg default constructor. If the enum class has no constructor declarations, a parameterless default constructor is automatically provided to match the implicit empty argument list.

Notice how an enum type can declare methods and attributes, again, just like a normal Java class. For member type declaration, all rules of scoping, access specifiers, and visibility are valid and therefore must be followed with regard to instance variables and methods. There is something rather interesting with the type AvgBalanceMethod. It's an enum within an enum. Since an enum type can support all types of class members, they can support enums too. Since AvgBalanceMethod is declared as public, it's visible outside the scope of the enclosing AccountType. Notice how it's accessed in the Account class.

Constant Class BodiesEnum constants can be associated with an arbitrary class body often referred to as a constant class body. Such classes are very similar to anonymous class declarations (even named similarly) and are implicitly static. This means they can access only static defined in the enclosing scope. Since constant classes are implicit extensions of the enclosing class, they can override methods defined in the enum type. In our example, enum constant Investment overrides getAvgBalanceMethod defined by AccountType. In fact, it would be perfectly legal to declare AccountType as abstract and force every enlisted enum constant to implement methods in the interface in their constant class body. A word of caution: although support for constant class bodies is a very powerful feature, it may be wise to avoid stretching them because of the same reasons why excessive use of anonymous classes is discouraged - they are less readable and hard to debug.

It's important to mention here that only a nonfinal instance method in java.lang.Enum is the toString() method. You can override and implement the per-constant toString() method to return a descriptive name for each enum constant. The default implementation of toString() returns just the string equivalent of the constant. Therefore, as illustrated in the example, it may be a good idea to override when a more descriptive literal is necessary.

Before we proclaim victory, two new classes introduced for enum support deserve consideration: java.util.EnumMap and java.util.EnumSet. As their names suggest, they are enum-enabled counterparts of the standard Java collection implementation. They both require that each element maintained by the collection belong to one enum type. In short, they won't let you mix and match enum constants from different types. It's rather interesting that they both retain the elements, e.g., the enum constants, in their declared order, totally ignoring any custom implementation of the compareTo() method. Be sure to check out their API documentation.

ConclusionThe new enums are a robust way to implement constant named lists and make them a compelling alternative to ad hoc enum implementations. With class-like behavior and the ability to support arbitrary class members, they are certainly bigger than they appear. Although you may not have an immediate need to use them in your projects, or at least not every feature they offer, keep them in your toolbox and you'll soon find them handy.

Resources

  • Java 5.0 Release candidate home page: http://java.sun.com/j2se/1.5.0/index.jsp
  • JSR 201 - check out the enum draft spec: http://jcp.org/en/jsr/detail?id=201
  • JSR 176 - J2SE 5.0 Release contents: http://jcp.org/en/jsr/detail?id=176

    SIDEBAR

    CAVEAT EMPTORLet the buyer beware: a simple axiom often used in commerce summarizes it well - it means the buyer alone is responsible for assessing the quality of a purchase before buying. Enums are so powerful, once you learn the ropes it's easy to be tempted to stretch and do "cool" things. Before you know it, bad things start happening.

    Always check out the API spec and know the expected behavior before you put something to use. As a smart programmer, you also need to know the limitations of the enums so that it can save your bacon some day.

    1.  You can't new enums: Remember they are singletons. For the JVM to handle them properly, only one instance of each should exist. They are automatically created for you. Luckily the compiler catches explicit instantiation. For the same reason, enum constructors are implicitly private. Think about it.

    2.  You can't extend enums: One enum cannot extend another one. You can't extend the primordial java.lang.Enum either. That's how it works and if you are worried about this limitation, your design demands a second look. You shouldn't need a hierarchy of enums.

    3.  You can't declare enums locally: Enum types cannot exist in any scope lower than a class scope. You can't define them within a method.

    4.  Order matters: Within the enum type class body, the constants must appear before other class elements such as attributes, methods, and constructors. This is true at least as of the 5.0 beta release.

    5.  No nulls please: An enum constant cannot be null. It's that simple.

    6.  Don't use ordinal: Code that uses an ordinal() method, e.g., logic based on the position of an enum constant as it appears in the declaration, must be discouraged. Your code will break at runtime if constants are subsequently reordered. What's more, this is a runtime error. The compiler will not catch such a thing.

    7.  Everything that sounds the same, isn't: There are a few other classes in JDK 5.0 that sound very similar - Enumeration, EnumControl, to name a few. Don't assume they are enum implementations. Check the Javadoc.

    8.  Spare the serialization: Enum serialization isn't like the normal one you have seen. The process by which enum constants are serialized cannot be customized. Any class-specific writeObject and writeReplace methods defined by enum types are ignored during serialization. Similarly, any serialPersistentFields or serialVersionUID field declarations are also ignored - all enum types have a fixed serialVersionUID of 0L. Again, this shouldn't concern you too much. Let the language take care of the specifics.


  • Use the Ruby on Rails Alternative | killexams.com real questions and Pass4sure dumps

    In-Depth

    Use the Ruby on Rails Alternative

    Take a more expedient approach for developing MVC Web applications than you might take using J2EE technologies.

  • By Deepak Vohra
  • 03/07/2007
  • Ruby on Rails is an open source Web framework for developing Model-View-Controller (MVC) Web applications that access databases. Ruby on Rails is based on the object-oriented Ruby scripting language. The model class in a Ruby on Rails application specifies the data model. A connection with the database is obtained in the model class, and the database table from which data is to be retrieved is specified. The controller class specifies the actions (methods) that contain the business logic to process data, and the view templates are the user interfaces (UIs) for the MVC application. Controller class methods are invoked from a view template, the controller class processes data using the model class, and it renders a view template or invokes another controller method.

    Ruby on Rails doesn't require configuration files as does a Java 2 Platform, Enterprise Edition (J2EE) application. Ruby on Rails requires a Web server and a database, and it includes the WEBrick Web server. It is also preconfigured with the MySQL database. Let's look at how to use Ruby on Rails to develop a Create-Read-Update-Delete (CRUD) application. A CRUD application is used essentially to create, manipulate, and delete database table entries.

    Because a Rails application is of the MVC pattern, the model and controller classes are Ruby classes (.rb files). The model class models data and extends the ActionRecord::Base class. Models provide object-relational mapping (ORM) between business objects and the database. The view templates are the UIs of a Ruby on Rails application and are represented with .rhtml or .rxml files. An RHTML view template is the more commonly used alternative and is Ruby-embedded HTML. The controller class extends the ActionController::Base class and specifies actions (methods) to process data. Ruby on Rails provides various commands to generate a Rails application and model and controller classes. Some Ruby on Rails commands are listed in Table 1.

    Get On TrackBegin by installing Ruby on Rails and including RubyGems, the standard package manager used with Ruby applications and libraries. Here is the procedure to install Ruby on Rails:

  • Download the Ruby Windows Installer application by double-clicking the ruby185-21.exe application to start the Ruby Setup Wizard. Click Next, and read and accept the license agreement.
  • Select the default components to install, which include the RubyGems package manager, and click Next.
  • Specify a directory to install Ruby (the default is c:/ruby), and click Next.
  • Choose a Start Menu folder, and click Install to install Ruby and RubyGems.
  • Install Rails by using the CD (change directory) command to make c:/ruby the current directory, and then run this command to install Rails and its dependencies—note that the activerecord package implements the model layer of a Rails MVC application, and the actionpack package implements the view and controller: gem install rails --include- dependencies
  • Use Setup.exe to download and install MySQL 5.0, and create a MySQL Server instance.
  • Now let's create a Ruby on Rails application that represents a journal catalog. Use the rails command on the command line to create a Ruby on Rails application in the catalog directory from within the ruby directory:

    rails catalog

    The app directory contains the subdirectories controllers, models, and view for the controller classes, model classes, and view templates, respectively. The config directory contains the database.yml file in which the database configuration is specified. A Rails application may be run in development (the default mode), test, or production mode.

    For the example here let's run the Rails application in development mode. Modify the development mode settings in the database.yml file to specify the database as mysql. The development mode settings for the MySQL database should look like this:

    development: adapter: mysql database: test username: root password: mysql host: localhost

    The db directory is used for migration scripts, which will be discussed shortly.

    Now we need to create a database table that will use ActiveRecord migrations. A migration class extends the ActiveRecord::Migration class and is run with the rake command. The rake command is similar to Ant's build tool for creating J2EE applications. A migration script gets created when a model class script is created. Create a model script with this command in the Ruby Console Window from the ruby/catalog directory:

    ruby script/generate model catalog

    The model class catalog.rb is created in the app/models directory, and the migration script 001_create_catalogs.rb is created in the db/migrate directory. The migration script class, CreateCatalogs, extends the ActiveRecord::Migration class:

    class CreateCatalogs < ActiveRecord::Migration def self.up create_table :catalogs do |t| # t.column :name, :string end end def self.down drop_table :catalogs end end

    The default migration script consists of the methods self.up and self.down. The self.up method is invoked to run a migration and create a database table. Use the create_table transformation of the ActiveRecord::Migration class to create a database table called catalogs. ActiveRecord uses pluralization to map a model class to a database table. The model class is singular and uppercase, and the database table is plural and lowercase.

    In the Ruby on Rails application example the model class is Catalog and the database table is catalogs. The ActiveRecord::Migration class provides various transformations for a database. Some of the transformations are listed in Table 2.

    Modify the migration script 001_create_catalogs.rb to create a database table, and then add data to the table. In the create_table transformation create a table called catalogs with the columns journal, publisher, edition, title, and author:

    create_table :catalogs do |t| t.column :journal, :string, :limit => 255 t.column :publisher, :string, :limit => 255 t.column :edition, :string, :limit => 255 t.column :title, :string, :limit => 255 t.column :author, :string, :limit => 255 end

    Valid column types are integer, float, datetime, date, timestamp, time, text, string binary, and boolean. Valid column options are limit, default, and null.

    Next, add data to the table with the ActiveRecord::Base class method, create, to add a table row:

    Catalog.create :journal => "developerWorks", :publisher => "IBM", :edition => "September 2006", :title=> "A PHP V5 migration guide", :author=>"Jack D. Herrington"

    Listing 1 shows the complete migration script. Run the migration with the rake command from the /ruby/catalog directory. Rails has a target called migrate to run migrations:

    rake db:migrate

    The catalogs database table is created in the MySQL database named mysql. The catalogs table has a primary key field of type int(11) and the auto_increment attribute, which generates a unique identity for new rows.

    Develop a CRUD ApplicationBefore we develop a Ruby on Rails CRUD application, note that a Ruby on Rails application consists of these Ruby scripts and view templates:

  • Model class in the app/models directory
  • Controller class in the app/controllers directory
  • View templates (RHTML files) in the app/views directory
  • Previously we created a model class Ruby script. We use an interface to create new entries in the database, retrieve entries, update entries, and delete entries. The interface to the data in the database is scaffolding. Scaffolding consists of controller and model Ruby classes and view templates. Rails provides two types of scaffolding, dynamic scaffolding and scaffolding created with the ScaffoldGenerator. You can create a dynamic scaffolding by adding this scaffold method invocation to the controller class:

    scaffold :modelname

    The scaffold method generates controller logic and view templates dynamically using a model class obtained with Rails naming conventions. The first letter of the modelname is uppercase to obtain the model class. For example, if the modelname specified in the scaffold method is catalog, the Catalog model class is used in the scaffolding.

    Instance variables @catalog/@catalogs are used in the controller class; controller instance variables are also available in the view templates. The Rails framework provides the scaffold generator to create a controller class, a model class, and the scaffolding for a CRUD application. Scaffolding generated with the ScaffoldGenerator is similar to the one generated with the scaffold method, except that the controller logic and view templates are generated when the ScaffoldGenerator command is run instead of being generated dynamically. In the Ruby console window run the scaffold generator:

    ruby script/generate scaffold catalog

    This command generates a model class, a controller class, and the view templates index.rhtml, list.rhtml, show.rhtml, new.rhtml, create.rhtml, edit.rhtml, update.rhtml, and destroy.rhtml. The Catalog model class looks like this:

    class Catalog > ActiveRecord::Base end

    Listing 2 shows the controller class CatalogsController.

    With the scaffolding these actions (methods) are generated in the controller class: index, list, show, new, create, edit, update, and destroy. The default view templates may be overridden with view templates in the views directory. For example, a custom view template edit.rhtml can be provided in the views/catalog directory.

    Next, let's run the Ruby on Rails application in the WEBrick Web server. Begin by starting the WEBrick server from the /ruby/catalog directory:

    ruby script/server

    Access the WEBrick Web server with the URL, http://localhost:3000 (see Figure 1). Display the list of catalog entries with the list view template, which is invoked with the URL, http://localhost:3000/catalogs/list. To create a new catalog entry click the New catalog link (see Figure 2). In the new view template add a catalog entry, and click the Create button. A new catalog entry is added in the list view template. Click the Show link to show a catalog entry. To delete a catalog entry click the Destroy link, and to edit a catalog entry click the Edit link (see Figure 3).

    Use the edit view template to modify the catalog entry; for example, modify the title and click the Edit button to update the catalog entry (see Figure 4).

    Ruby on Rails is simpler than J2EE for developing MVC Web applications. The JavaServer Pages (JSP), HTML, servlets, Enterprise JavaBeans (EJB), and configuration fields that are required in a J2EE application are not required for a Ruby on Rails application.

    About the Author

    Deepak Vohra, a Sun-certified Java programmer and Sun-certified Web component developer, has published numerous articles in industry publications and journals. Deepak is the author of the book "Ruby on Rails for PHP and Java Developers."


    Anatomy of a Java Finalizer | killexams.com real questions and Pass4sure dumps

    A couple of patterns that could cause Java heap exhaustion were identified from years of research at IBM. One interesting scenario was observed when Java applications generated an excessive amount of finalizable objects whose classes had non-trivial Java finalizers.

    What Is a Java Finalizer?A Java finalizer performs finalization tasks for an object. It's the opposite of a Java constructor, which creates and initializes an instance of a Java class. A Java finalizer can be used to perform postmortem cleanup tasks on an instance of a class or to release system resources such as file descriptors or network socket connections when an object is no longer needed and those resources have to be released for other objects. You don't need any argument or any return value for a finalizer. Unfortunately the current Java language specification does not define any finalizers for a Java class or interface when a class or interface is unloaded. Let's take a closer look at finalize() method of java.lang.Object that provides an instance method, finalize() for finalization:

    protected void finalize() throws Throwable

    When a Java object is no longer needed, the space occupied by the object is supposed to be recycled automatically by the Java garbage collector. This is one of the significant differences in Java and is not found in most structural programming languages like C. If an instance of a class implements the finalize() method, its space cannot be recycled by the garbage collector in a timely fashion. Worst case, it may not be recycled at all.

    Any instances of classes that implement the finalize() method are often called finalizable objects. They will not be immediately reclaimed by the Java garbage collector when they are no longer referenced. Instead, the Java garbage collector appends the objects to a special queue for the finalization process. Usually it's performed by a special thread called a "Reference Handler" on some Java Virtual Machines. During this finalization process, the "Finalizer" thread will execute each finalize() method of the objects. Only after successful completion of the finalize() method will an object be handed over for Java garbage collection to get its space reclaimed by "future" garbage collection. I did not say "current," which means at least two garbage collection cycles are required to reclaim the finalizable object. Sounds like it has some overhead? You got it. We need several shots to get the space recycled.

    Finalizer threads are not given maximum priorities on systems. If a "Finalizer" thread cannot keep up with the rate at which higher priority threads cause finalizable objects to be queued, the finalizer queue will keep growing and cause the Java heap to fill up. Eventually the Java heap will get exhausted and a java.lang.OutOfMemoryError will be thrown.

    A Java Virtual Machine will never invoke the finalize() method more than once for any object. If there's any exception thrown by the finalize() method, the finalization of the object is halted.

    You are free to do virtually anything in the finalize() method of your class. When you do that, please do not expect the memory space occupied by each and every object to be reclaimed by the Java garbage collector when the object is no longer referenced or no longer needed. Why? It is not guaranteed that the finalize() method will complete the execution in timely manner. Worst case, it may not be even invoked even when there are no more references to the object. That means it's not guaranteed that any objects that have a finalize() method are garbage collected. That's a potential hazard from a memory management perspective and, needless to say, there is considerable overhead for queuing, dequeuing, running the finalize() method, and rescanning the object in the next garbage collection cycle.

    If you want to run cleanup tasks on objects, consider finalizers as a last resort and implement your own cleanup method, which will be more predictable. It's very risky to rely on finalizers for postmortem cleanup tasks, especially if your finalizable objects have references to native resources.

    Hands-on Experience with Java FinalizerWe can easily simulate this scenario with a couple of test applications and take a look at dumps and traces to see what's happening inside of the Java heap and threads for hands-on experience.

    Let's build a couple of Java classes to recreate typical scenarios.

    In ObjectWYieldFinalizer, we can implement the method finalize() with Thread.yield() so that finalize() cannot complete its execution (see Listing 1) (Listings 1-7 can be downloaded here.)

    The Thread.yield() method prevents the currently executing thread from running and allows other threads to execute. If the Finalizer thread calls this finalize() method, it will pause its execution.

    In ObjectWExceptionFinalizer, the finalizer() method immediately throws a java.lang.IndexOutOfBoundsException. If the Finalizer thread calls this finalize() method, the object finalization won't be completed because of the exception and there's no second chance to run the finalize() method (see Listing 2).

    In ObjectWEmptyFinalizer, we don't implement any code in the finalize() method (see Listing 3). ObjectWOFinalizer doesn't have any finalize() method (see Listing 4).

    Let's run each of the classes to see what happens. Sun's Java Virtual Machine (JVM) can be used with the following options for the class TestObjectWYieldFinalizer.

    /sun1.6.0_10/bin/java -Xmx50m -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+HeapDumpOnOutOfMemoryError TestObjectWYieldFinalizer > verbosegc.txt

    It looks very complicated. Why do we need those command-line options? Well, without those options, we only get a little information about Java garbage collection activities like this:

    [Full GC 50815K->45644K(50816K), 0.2276940 secs][Full GC 48780K->46415K(50816K), 0.2233279 secs][Full GC 49551K->49551K(50816K), 0.2396315 secs][Full GC 50815K->50815K(50816K), 0.1886312 secs][Full GC 50815K->49219K(50816K), 0.1964926 secs][Full GC 50815K->50815K(50816K), 0.1865343 secs][Full GC 50815K->50815K(50816K), 0.1836961 secs]

    We only get a type of garbage collection (Full GC), total Java heap usage before garbage collection (50,815K), total Java heap usage after garbage collection (45,644K), a high watermark of total Java heap (50,816K), and time spent in the garbage collection (0.2276940 secs).

    High watermark is the size of the current Java heap. The Java heap can expand its size up to a maximum size or contract to manage Java heap effectively.

    The -XX:+PrintGCDetails option lets the JVM provide information on each generation in the Java heap.

    We can see Java heap usage and the time (in seconds) spent in Java garbage collection of each new generation, tenured generation, and permanent generation with the -XX:+PrintGCDetails option in the following example:

    [GC [DefNew: 3520K->3520K(3520K), 0.0001143 secs][Tenured: 43897K->47295K(47296K), 0.2110999 secs] 47417K->47415K(50816K), [Perm : 17K->17K(12288K)], 0.2115593 secs][Times: user=0.22 sys=0.00, real=0.22 secs]

    In tenured generation, Java heap usage was 43,897KB before this Java garbage collection. Java heap usage reached 47,295KB after Java garbage collection; 47296K is the size of the high watermark of the tenured generation; 0.2110999 second was spent to collect the tenured generation. Unfortunately we do not see the maximum size of each generation with the -XX:+PrintGCDetails option alone.

    With -XX:+PrintGCTimeStamps, we can get a timestamp for each garbage collection like this:

    1.393: [GC 1002K->106K(5056K), 0.0001036 secs]

    This garbage collection started 1.393 seconds after the JVM started.

    The -XX:+PrintHeapAtGC option provides extensive information about each Java garbage collection (see Listing 5).

    We can even see the address range of each generation. Unfortunately there's no timestamp for each garbage collection with -XX:+PrintHeapAtGC option alone.

    The last option, -XX:-HeapDumpOnOutOfMemoryError allows the JVM to dump the Java heap to a file when an allocation from the Java heap cannot be satisfied or a java.lang.OutOfMemoryError is thrown. This option was introduced in Sun Java 1.4.2 update 12 and Sun Java 5.0 update 7.

    If you want to experiment with IBM's Java Virtual Machine, all you need is a -verbosegc command-line option. You do not need any of these: -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC, or -XX:+HeapDumpOnOutOfMemoryError.

    Let's take a look at what happened to the class while we talked about Sun JVM's command-line option. We've got java.lang.OutOfMemoryError from TestObjectWYieldFinalizer:

    Exception in the thread "main" java.lang.OutOfMemoryError: Java heap spaceat java.lang.ref.Finalizer.register(Finalizer.java:72)at java.lang.Object.<init>(Object.java:20)at ObjectWYieldFinalizer.<init>(ObjectWYieldFinalizer.java:2)at TestObjectWYieldFinalizer.main(TestObjectWYieldFinalizer.java:11)

    "java.lang.OutOfMemoryError: Java heap space." That means we got Java heap space exhaustion. The JVM could not allocate any more Java heap while running the method java.lang.ref.Finalizer.register(), which is on line 72 of Finalizer.java. Finalizer.java? Of course, we did not write Finalizer.java. That's a part of the JVM. We can also check verbosegc.txt to which we redirected the garbage collection trace (see Listing 6).

    About 3.711 seconds after the JVM started, we got java.lang.OutOfMemoryError. The Java heap dump is written to pid124.hprof.

    Analysis of Java Garbage Collection TracesWe can use a tool to analyze this trace. The IBM Pattern Modeling and Analysis Tool for Java Garbage Collector (PMAT) is one of top five technologies at alphaWorks. I have implemented patented algorithms to predict future failures related to Java heap exhaustion in this tool. Please refer to United States Patent No. 7,475,214 if you are interested in the algorithms. Although we don't need these algorithms to investigate simple problem like this, you might be able to find situations where you could get some insight from fortune tellers. We can get a copy of the tool here.

    PMAT parses verbose garbage collection (GC) trace, analyzes Java heap usage, and recommends possible solutions based on pattern modeling of Java heap usage.

    The following features are included:

  • GC analysis
  • GC table view
  • Allocation failure summary
  • GC usage summary
  • GC duration summary
  • GC graph view
  • GC pattern analysis
  • Zoom in/out/selection/center of chart view
  • The tool can also parse Sun's Java garbage collector traces, including the following:

  • Serial collector
  • Throughput/parallel collector
  • Concurrent collector
  • Incremental/train collector
  • We can start version 3.2 of the tool with a jar file in the download package. (V3.2 was the latest version when this article was written.)

    # /usr/java5/bin/java -Xmx200m -jar ga32.jar

    The tool provides a headless mode but let's bring up the graphical user interface mode for easy demonstration. We can click on the "N" icon to open Sun's trace file. We can click on "I" for IBM's trace file as seen in Figure 1.

    We can see in Figure 2 the analysis result and recommendation virtually instantly.



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