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Old JAXB Core module. Contains sources required by XJC, JXC and Runtime modules with dependencies.

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package com.sun.istack;

import java.util.concurrent.ConcurrentLinkedQueue;
import java.lang.ref.WeakReference;

/**
 * Pool of reusable objects that are indistinguishable from each other,
 * such as JAXB marshallers.
 *
 * @author Kohsuke Kawaguchi
 */
public interface Pool {

    /**
     * Gets a new object from the pool.
     *
     * 

* If no object is available in the pool, this method creates a new one. */ @NotNull T take(); /** * Returns an object back to the pool. */ void recycle(@NotNull T t); /** * Default implementation that uses {@link ConcurrentLinkedQueue} * as the data store. * *

Note for Implementors

*

* Don't rely on the fact that this class extends from {@link ConcurrentLinkedQueue}. */ public abstract class Impl implements Pool { private volatile WeakReference> queue; /** * Gets a new object from the pool. * *

* If no object is available in the pool, this method creates a new one. * * @return * always non-null. */ public final @NotNull T take() { T t = getQueue().poll(); if(t==null) { return create(); } return t; } /** * Returns an object back to the pool. */ public final void recycle(T t) { getQueue().offer(t); } private ConcurrentLinkedQueue getQueue() { WeakReference> q = queue; if (q != null) { ConcurrentLinkedQueue d = q.get(); if (d != null) { return d; } } // overwrite the queue ConcurrentLinkedQueue d = new ConcurrentLinkedQueue(); queue = new WeakReference>(d); return d; } /** * Creates a new instance of object. * *

* This method is used when someone wants to * {@link #take() take} an object from an empty pool. * *

* Also note that multiple threads may call this method * concurrently. */ protected abstract @NotNull T create(); } }





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