Examples of org.apache.hadoop.io.DataInputBuffer$Buffer

org.apache.commons.collections15.Buffer
A reusable {@link DataInput} implementation that reads from an in-memorybuffer.
This saves memory over creating a new DataInputStream and ByteArrayInputStream each time data is read.
Typical usage is something like the following:
```
 DataInputBuffer buffer = new DataInputBuffer(); while (... loop condition ...) { byte[] data = ... get data ...; int dataLength = ... get data length ...; buffer.reset(data, dataLength); ... read buffer using DataInput methods ... } 
```

    /**
     * Tests {@link BlockingBuffer#get()} in combination with {@link BlockingBuffer#add()}.
     */
    public void testGetWithAdd() {


        Buffer blockingBuffer = BlockingBuffer.decorate(new MyBuffer());
        Object obj = new Object();


        new DelayedAdd(blockingBuffer, obj).start();


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

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    /**
     * Tests {@link BlockingBuffer#get()} in combination with {@link BlockingBuffer#addAll()}.
     */
    public void testGetWithAddAll() {


        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.get());
    }

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    /**
     * Tests {@link BlockingBuffer#remove()} in combination with {@link BlockingBuffer#add()}.
     */
    public void testRemoveWithAdd() {


        Buffer blockingBuffer = BlockingBuffer.decorate(new MyBuffer());
        Object obj = new Object();


        new DelayedAdd(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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    /**
     * Tests {@link BlockingBuffer#remove()} in combination with {@link BlockingBuffer#addAll()}.
     */
    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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     * 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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     * 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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     * 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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     * 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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     * 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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