67 lines
1.8 KiB
C#
67 lines
1.8 KiB
C#
//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace System.Activities.Runtime
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{
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using System;
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using System.Runtime;
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// Pool<T> defined below is a LIFO pool of Pool.IClearable objects.
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// It is strongly typed to make the Acquire/Release methods more user
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// friendly. To use this pool, subclass it with a concrete type and
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// override the CreateNew method. Typically, the type of T will
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// have a default ctor and will use an Initialize(...) method in order
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// to configure it for use.
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// NOTE: CreateNew is required because T : new() requires that the default
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// ctor is public. We did not want to put public ctors on some of our
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// pooled resources (like NativeActivityContext).
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abstract class Pool<T>
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{
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const int DefaultPoolSize = 10;
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T[] items;
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int count;
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int poolSize;
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public Pool()
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: this(DefaultPoolSize)
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{
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}
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public Pool(int poolSize)
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{
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this.items = new T[poolSize];
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this.poolSize = poolSize;
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}
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public T Acquire()
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{
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if (this.count > 0)
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{
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this.count--;
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T item = this.items[this.count];
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return item;
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}
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else
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{
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return CreateNew();
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}
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}
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protected abstract T CreateNew();
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public void Release(T item)
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{
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if (this.count < this.poolSize)
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{
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this.items[this.count] = item;
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this.count++;
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}
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}
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}
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}
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