Examples of org.apache.commons.pool2.impl.BaseGenericObjectPool

org.apache.commons.pool2.Waiter
Base class that provides common functionality for {@link GenericObjectPool}and {@link GenericKeyedObjectPool}. The primary reason this class exists is reduce code duplication between the two pool implementations. @param < T> Type of element pooled in this pool.This class is intended to be thread-safe. @version $Revision: $ @since 2.0

            if (p == null) {
                return;  // Object was abandoned and removed
            } else {
                // Make sure object is not being reclaimed
                synchronized(p) {
                    final PooledObjectState state = p.getState();
                    if (state == PooledObjectState.ABANDONED ||
                            state == PooledObjectState.INVALID) {
                        return;
                    } else {
                        p.markReturning(); // Keep from being marked abandoned

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            if (p == null) {
                return;  // Object was abandoned and removed
            } else {
                // Make sure object is not being reclaimed
                synchronized(p) {
                    final PooledObjectState state = p.getState();
                    if (state != PooledObjectState.ALLOCATED) {
                        throw new IllegalStateException(
                                "Object has already been retured to this pool or is invalid");
                    } else {
                        p.markReturning(); // Keep from being marked abandoned

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            if (p == null) {
                return;  // Object was abandoned and removed
            } else {
                // Make sure object is not being reclaimed
                synchronized(p) {
                    final PooledObjectState state = p.getState();
                    if (state == PooledObjectState.ABANDONED ||
                            state == PooledObjectState.INVALID) {
                        return;
                    } else {
                        p.markReturning(); // Keep from being marked abandoned

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        pool.setSwallowedExceptionListener(null); // must simply return
        final List<Exception> swallowedExceptions = new ArrayList<Exception>();
        /*
         * A simple listener, that will throw a OOM on 3rd exception.
         */
        final SwallowedExceptionListener listener = new SwallowedExceptionListener() {
            @Override
            public void onSwallowException(Exception e) {
                if (swallowedExceptions.size() == 2) {
                    throw new OutOfMemoryError();
                } else {

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     * exceptions queue.
     *
     * @param e exception to be swallowed
     */
    final void swallowException(Exception e) {
        SwallowedExceptionListener listener = getSwallowedExceptionListener();


        if (listener == null) {
            return;
        }


        try {
            listener.onSwallowException(e);
        } catch (OutOfMemoryError oome) {
            throw oome;
        } catch (VirtualMachineError vme) {
            throw vme;
        } catch (Throwable t) {

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     * exceptions queue.
     *
     * @param e exception to be swallowed
     */
    final void swallowException(Exception e) {
        SwallowedExceptionListener listener = getSwallowedExceptionListener();


        if (listener == null) {
            return;
        }


        try {
            listener.onSwallowException(e);
        } catch (OutOfMemoryError oome) {
            throw oome;
        } catch (VirtualMachineError vme) {
            throw vme;
        } catch (Throwable t) {

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     * exceptions queue.
     *
     * @param e exception to be swallowed
     */
    final void swallowException(Exception e) {
        SwallowedExceptionListener listener = getSwallowedExceptionListener();


        if (listener == null) {
            return;
        }


        try {
            listener.onSwallowException(e);
        } catch (OutOfMemoryError oome) {
            throw oome;
        } catch (VirtualMachineError vme) {
            throw vme;
        } catch (Throwable t) {

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        pool.setSwallowedExceptionListener(null); // must simply return
        final List<Exception> swallowedExceptions = new ArrayList<Exception>();
        /*
         * A simple listener, that will throw a OOM on 3rd exception.
         */
        final SwallowedExceptionListener listener = new SwallowedExceptionListener() {
            @Override
            public void onSwallowException(Exception e) {
                if (swallowedExceptions.size() == 2) {
                    throw new OutOfMemoryError();
                } else {

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        // See if we end up with dead man walking
        SimpleTestThread<Waiter> t2 = new SimpleTestThread<Waiter>(waiterPool, "51");
        Thread thread2 = new Thread(t2);
        thread2.start();  // Triggers clearOldest, killing all of the 0's and the 2 oldest 1's
        Thread.sleep(50); // Wait for clearOldest to kick off, but not long enough to reach the 1's
        Waiter waiter = waiterPool.borrowObject("1");
        Thread.sleep(200); // Wait for execution to happen
        waiterPool.returnObject("1", waiter);  // Will throw IllegalStateException if dead
        waiterPool.close();
    }

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        // See if we end up with dead man walking
        SimpleTestThread<Waiter> t2 = new SimpleTestThread<Waiter>(waiterPool, "51");
        Thread thread2 = new Thread(t2);
        thread2.start();  // Triggers clearOldest, killing all of the 0's and the 2 oldest 1's
        Thread.sleep(50); // Wait for clearOldest to kick off, but not long enough to reach the 1's
        Waiter waiter = waiterPool.borrowObject("1");
        Thread.sleep(200); // Wait for execution to happen
        waiterPool.returnObject("1", waiter);  // Will throw IllegalStateException if dead
        waiterPool.close();
    }

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