🗊Презентация The Basics of Object Lifetime. Disposing objects (Java)

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The Basics of Object Lifetime. Disposing objects (Java), слайд №1The Basics of Object Lifetime. Disposing objects (Java), слайд №2The Basics of Object Lifetime. Disposing objects (Java), слайд №3The Basics of Object Lifetime. Disposing objects (Java), слайд №4The Basics of Object Lifetime. Disposing objects (Java), слайд №5The Basics of Object Lifetime. Disposing objects (Java), слайд №6The Basics of Object Lifetime. Disposing objects (Java), слайд №7The Basics of Object Lifetime. Disposing objects (Java), слайд №8The Basics of Object Lifetime. Disposing objects (Java), слайд №9The Basics of Object Lifetime. Disposing objects (Java), слайд №10The Basics of Object Lifetime. Disposing objects (Java), слайд №11The Basics of Object Lifetime. Disposing objects (Java), слайд №12The Basics of Object Lifetime. Disposing objects (Java), слайд №13The Basics of Object Lifetime. Disposing objects (Java), слайд №14The Basics of Object Lifetime. Disposing objects (Java), слайд №15The Basics of Object Lifetime. Disposing objects (Java), слайд №16The Basics of Object Lifetime. Disposing objects (Java), слайд №17The Basics of Object Lifetime. Disposing objects (Java), слайд №18The Basics of Object Lifetime. Disposing objects (Java), слайд №19The Basics of Object Lifetime. Disposing objects (Java), слайд №20
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The Basics of Object Lifetime. Disposing objects.
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The Basics of Object Lifetime. Disposing objects.

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AGENDA The Basics of Object Lifetime Building Finalizable Objects Building Disposable Objects Dispose pattern
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AGENDA The Basics of Object Lifetime Building Finalizable Objects Building Disposable Objects Dispose pattern

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The Basics of Object Lifetime
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The Basics of Object Lifetime

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The Basics of Object Lifetime
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The Basics of Object Lifetime

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The Role of Application Roots Root is a storage location containing a reference to an object on the managed heap: • References to global objects • References to any static objects/static fields • References to local objects within an application’s code base • References to object parameters passed into a method • References to objects waiting to be finalized • Any CPU register that references an object
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The Role of Application Roots Root is a storage location containing a reference to an object on the managed heap: • References to global objects • References to any static objects/static fields • References to local objects within an application’s code base • References to object parameters passed into a method • References to objects waiting to be finalized • Any CPU register that references an object

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Object Generations Each object on the heap belongs to one of the following generations: • Generation 0: Identifies a newly allocated object that has never been marked for collection. • Generation 1: Identifies an object that has survived a garbage collection (i.e., it was marked for collection but was not removed due to the fact that the sufficient heap space was acquired). • Generation 2: Identifies an object that has survived more than one sweep of the garbage collector.
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Object Generations Each object on the heap belongs to one of the following generations: • Generation 0: Identifies a newly allocated object that has never been marked for collection. • Generation 1: Identifies an object that has survived a garbage collection (i.e., it was marked for collection but was not removed due to the fact that the sufficient heap space was acquired). • Generation 2: Identifies an object that has survived more than one sweep of the garbage collector.

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Building Finalizable Objects  Rule The reason to override Finalize() is if your C# class is making use of unmanaged resources via PInvoke or complex COM interoperability tasks. The reason is that you are manipulating memory that the CLR cannot manage.
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Building Finalizable Objects  Rule The reason to override Finalize() is if your C# class is making use of unmanaged resources via PInvoke or complex COM interoperability tasks. The reason is that you are manipulating memory that the CLR cannot manage.

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Building Finalizable Objects You can’t override the Finalize() method directly in your class, but you may use of a destructor syntax to achieve the same effect. Destructor never takes an access modifier (implicitly protected), never takes parameters, and can’t be overloaded (only one finalizer per class).
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Building Finalizable Objects You can’t override the Finalize() method directly in your class, but you may use of a destructor syntax to achieve the same effect. Destructor never takes an access modifier (implicitly protected), never takes parameters, and can’t be overloaded (only one finalizer per class).

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Building Disposable Objects
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Building Disposable Objects

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The Basics of Object Lifetime. Disposing objects (Java), слайд №10
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The Basics of Object Lifetime. Disposing objects (Java), слайд №11
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using
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using

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Dispose pattern The Dispose Pattern is intended to standardize the usage and implementation of finalizers and the IDisposable interface. √ DO implement the Basic Dispose Pattern on types containing instances of disposable types. √ DO implement the Basic Dispose Pattern and provide a finalizer on types holding resources that need to be freed explicitly and that do not have finalizers. √ CONSIDER implementing the Basic Dispose Pattern on classes that themselves don’t hold unmanaged resources or disposable objects but are likely to have subtypes that do.
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Dispose pattern The Dispose Pattern is intended to standardize the usage and implementation of finalizers and the IDisposable interface. √ DO implement the Basic Dispose Pattern on types containing instances of disposable types. √ DO implement the Basic Dispose Pattern and provide a finalizer on types holding resources that need to be freed explicitly and that do not have finalizers. √ CONSIDER implementing the Basic Dispose Pattern on classes that themselves don’t hold unmanaged resources or disposable objects but are likely to have subtypes that do.

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Dispose pattern Involves implementing the System.IDisposable interface Declare the Dispose(bool) method that implements all resource cleanup logic to be shared between the Dispose method and the optional finalizer.
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Dispose pattern Involves implementing the System.IDisposable interface Declare the Dispose(bool) method that implements all resource cleanup logic to be shared between the Dispose method and the optional finalizer.

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Dispose pattern DO NOT make the parameterless Dispose method virtual. The Dispose(bool) method is the one that should be overridden by subclasses.
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Dispose pattern DO NOT make the parameterless Dispose method virtual. The Dispose(bool) method is the one that should be overridden by subclasses.

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Dispose pattern √ DO allow the Dispose(bool) method to be called more than once. The method might choose to do nothing after the first call.
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Dispose pattern √ DO allow the Dispose(bool) method to be called more than once. The method might choose to do nothing after the first call.

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Dispose pattern √ DO throw an ObjectDisposedException from any member that cannot be used after the object has been disposed of.
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Dispose pattern √ DO throw an ObjectDisposedException from any member that cannot be used after the object has been disposed of.

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Dispose pattern √ CONSIDER providing method Close(), in addition to the Dispose(), if close is standard terminology in the area.
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Dispose pattern √ CONSIDER providing method Close(), in addition to the Dispose(), if close is standard terminology in the area.

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Questions ?
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Questions ?

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