Examples of org.apache.commons.collections.Buffer

org.apache.commons.collections.Buffer
Defines a collection that allows objects to be removed in some well-defined order.
The removal order can be based on insertion order (eg, a FIFO queue or a LIFO stack), on access order (eg, an LRU cache), on some arbitrary comparator (eg, a priority queue) or on any other well-defined ordering.
Note that the removal order is not necessarily the same as the iteration order. A Buffer implementation may have equivalent removal and iteration orders, but this is not required.
This interface does not specify any behavior for {@link Object#equals(Object)} and {@link Object#hashCode} methods. Itis therefore possible for a Buffer implementation to also also implement {@link java.util.List}, {@link java.util.Set} or {@link Bag}. @since Commons Collections 2.1 @version $Revision: 1.10 $ $Date: 2004/02/18 01:15:42 $ @author Avalon @author Berin Loritsch @author Paul Jack @author Stephen Colebourne


    /**
     * Tests {@link BlockingBuffer#remove()} in combination with {@link BlockingBuffer#addAll(java.util.Collection)}.
     */
    public void testRemoveWithAddAll() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer() );
        Object obj = new Object();
        new DelayedAddAll( blockingBuffer, obj ).start();


        // verify does not throw BufferUnderflowException; should block until other thread has added to the buffer .
        assertSame( obj, blockingBuffer.remove() );
    }

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        // verify does not throw BufferUnderflowException; should block until other thread has added to the buffer .
        assertSame( obj, blockingBuffer.remove() );
    }


    public void testRemoveWithAddAllTimeout() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer(), 100 );
        Object obj = new Object();
        new DelayedAddAll( blockingBuffer, obj, 500 ).start();
        try {
            blockingBuffer.remove();
        }
        catch( BufferUnderflowException e ) {
        }
    }

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     * threads.
     * <p/>
     * Two read threads should block on an empty buffer until one object is added then both threads should complete.
     */
    public void testBlockedGetWithAdd() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer() );
        Object obj = new Object();


        // run methods will get and compare -- must wait for add
        Thread thread1 = new ReadThread( blockingBuffer, obj );
        Thread thread2 = new ReadThread( blockingBuffer, obj );
        thread1.start();
        thread2.start();


        // give hungry read threads ample time to hang
        delay();


        // notifyAll should allow both read threads to complete
        blockingBuffer.add( obj );


        // allow notified threads to complete 
        delay();


        // There should not be any threads waiting.

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     * multiple read threads.
     * <p/>
     * Two read threads should block on an empty buffer until a singleton is added then both threads should complete.
     */
    public void testBlockedGetWithAddAll() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer() );
        Object obj = new Object();


        // run methods will get and compare -- must wait for addAll
        Thread thread1 = new ReadThread( blockingBuffer, obj );
        Thread thread2 = new ReadThread( blockingBuffer, obj );
        thread1.start();
        thread2.start();


        // give hungry read threads ample time to hang
        delay();


        // notifyAll should allow both read threads to complete
        blockingBuffer.addAll( Collections.singleton( obj ) );


        // allow notified threads to complete 
        delay();


        // There should not be any threads waiting.

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    /**
     * Tests interrupted {@link BlockingBuffer#get()}.
     */
    public void testInterruptedGet() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer() );
        Object obj = new Object();


        // spawn a read thread to wait on the empty buffer
        ArrayList exceptionList = new ArrayList();
        Thread thread = new ReadThread( blockingBuffer, obj, exceptionList );

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     * <p/>
     * Two read threads should block on an empty buffer until one object is added then one thread should complete. The
     * remaining thread should complete after the addition of a second object.
     */
    public void testBlockedRemoveWithAdd() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer() );
        Object obj = new Object();


        // run methods will remove and compare -- must wait for add
        Thread thread1 = new ReadThread( blockingBuffer, obj, null, "remove" );
        Thread thread2 = new ReadThread( blockingBuffer, obj, null, "remove" );
        thread1.start();
        thread2.start();


        // give hungry read threads ample time to hang
        delay();
        blockingBuffer.add( obj );


        // allow notified threads to complete 
        delay();


        // There should be one thread waiting.
        assertTrue( "There is one thread waiting", thread1.isAlive() ^ thread2.isAlive() );
        blockingBuffer.add( obj );


        // allow notified thread to complete 
        delay();


        // There should not be any threads waiting.

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     * <p/>
     * Two read threads should block on an empty buffer until a singleton collection is added then one thread should
     * complete. The remaining thread should complete after the addition of a second singleton.
     */
    public void testBlockedRemoveWithAddAll1() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer() );
        Object obj = new Object();


        // run methods will remove and compare -- must wait for addAll
        Thread thread1 = new ReadThread( blockingBuffer, obj, null, "remove" );
        Thread thread2 = new ReadThread( blockingBuffer, obj, null, "remove" );
        thread1.start();
        thread2.start();


        // give hungry read threads ample time to hang
        delay();
        blockingBuffer.addAll( Collections.singleton( obj ) );


        // allow notified threads to complete 
        delay();


        // There should be one thread waiting.
        assertTrue( "There is one thread waiting", thread1.isAlive() ^ thread2.isAlive() );
        blockingBuffer.addAll( Collections.singleton( obj ) );


        // allow notified thread to complete 
        delay();


        // There should not be any threads waiting.

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     * <p/>
     * Two read threads should block on an empty buffer until a collection with two distinct objects is added then both
     * threads should complete. Each thread should have read a different object.
     */
    public void testBlockedRemoveWithAddAll2() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer() );
        Object obj1 = new Object();
        Object obj2 = new Object();
        Set objs = Collections.synchronizedSet( new HashSet() );
        objs.add( obj1 );
        objs.add( obj2 );


        // run methods will remove and compare -- must wait for addAll
        Thread thread1 = new ReadThread( blockingBuffer, objs, "remove" );
        Thread thread2 = new ReadThread( blockingBuffer, objs, "remove" );
        thread1.start();
        thread2.start();


        // give hungry read threads ample time to hang
        delay();
        blockingBuffer.addAll( objs );


        // allow notified threads to complete 
        delay();
        assertEquals( "Both objects were removed", 0, objs.size() );

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    /**
     * Tests interrupted remove.
     */
    public void testInterruptedRemove() {
        Buffer blockingBuffer = BlockingBuffer.decorate( new MyBuffer() );
        Object obj = new Object();


        // spawn a read thread to wait on the empty buffer
        ArrayList exceptionList = new ArrayList();
        Thread thread = new ReadThread( blockingBuffer, obj, exceptionList, "remove" );

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    public Collection makeCollection() {
        return UnmodifiableBuffer.decorate(new UnboundedFifoBuffer());
    }
    
    public Collection makeFullCollection() {
        Buffer buffer = new UnboundedFifoBuffer();
        buffer.addAll(Arrays.asList(getFullElements()));
        return UnmodifiableBuffer.decorate(buffer);
    }

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