Examples of org.apache.tomcat.dbcp.pool2.SwallowedExceptionListener

org.apache.tomcat.dbcp.pool2.SwallowedExceptionListener
Pools that unavoidably swallow exceptions may be configured with an instance of this listener so the user may receive notification of when this happens. The listener should not throw an exception when called but pools calling listeners should protect themselves against exceptions anyway. @since 2.0

        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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            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 returned 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.ALLOCATED) {
                        throw new IllegalStateException(
                                "Object has already been returned 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.ALLOCATED) {
                        throw new IllegalStateException(
                                "Object has already been returned to this pool or is invalid");
                    } else {
                        p.markReturning(); // Keep from being marked abandoned

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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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