Examples of org.apache.qpid.client.failover.FailoverException

org.apache.qpid.client.failover.FailoverException
FailoverException is used to indicate that a synchronous request has failed to receive the reply that it is waiting for because the fail-over process has been started whilst it was waiting for its reply. Synchronous methods generally raise this exception to indicate that they must be re-tried once the fail-over process has completed.
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Used to indicate failure of a synchronous request due to fail-over.
@todo This exception is created and passed as an argument to a method, rather than thrown. The exception is beingused to represent an event, passed out to other threads. Use of exceptions as arguments rather than as exceptions is extremly confusing. Ideally use a condition or set a flag and check it instead. This exceptions-as-events pattern seems to be in a similar style to Mina code, which is not pretty, but potentially acceptable for that reason. We have the option of extending the mina model to add more events to it, that is, anything that is interested in handling failover as an event occurs below the main amq event handler, which knows the specific interface of the qpid handlers, which can pass this down as an explicit event, without it being an exception. Add failover method to BlockingMethodFrameListener, have it set a flag or interrupt the waiting thread, which then creates and raises this exception.

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Used to indicate failure of a synchronous request due to fail-over.

        // Set the last exception in the sync block to ensure the ordering with add.
        // either this gets done and the add does the ml.error
        // or the add completes first and the iterator below will do ml.error
        synchronized (_frameListeners)
        {
            _lastFailoverException = new FailoverException("Failing over about to start");
        }


        //Only notify the Frame listeners that failover is going to occur as the State listeners shouldn't be
        // interrupted unless failover cannot restore the state.
        propagateExceptionToFrameListeners(_lastFailoverException);

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        // Set the last exception in the sync block to ensure the ordering with add.
        // either this gets done and the add does the ml.error
        // or the add completes first and the iterator below will do ml.error
        synchronized (_frameListeners)
        {
            _lastFailoverException = new FailoverException("Failing over about to start");
        }


        //Only notify the Frame listeners that failover is going to occur as the State listeners shouldn't be
        // interrupted unless failover cannot restore the state.
        propagateExceptionToFrameListeners(_lastFailoverException);

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        // Set the last exception in the sync block to ensure the ordering with add.
        // either this gets done and the add does the ml.error
        // or the add completes first and the iterator below will do ml.error
        synchronized (_frameListeners)
        {
            _lastFailoverException = new FailoverException("Failing over about to start");
        }


        //Only notify the Frame listeners that failover is going to occur as the State listeners shouldn't be
        // interrupted unless failover cannot restore the state.
        propagateExceptionToFrameListeners(_lastFailoverException);

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        // Set the last exception in the sync block to ensure the ordering with add.
        // either this gets done and the add does the ml.error
        // or the add completes first and the iterator below will do ml.error
        synchronized (_frameListeners)
        {
            _lastFailoverException = new FailoverException("Failing over about to start");
        }


        //Only notify the Frame listeners that failover is going to occur as the State listeners shouldn't be
        // interupted unless failover cannot restore the state.
        propagateExceptionToFrameListeners(_lastFailoverException);

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     * Not supported at this level.
     */
    public void resubscribeSessions() throws JMSException, AMQException, FailoverException
    {
        //NOT implemented as railover is handled at a lower level
        throw new FailoverException("failing to reconnect during failover, operation not supported.");
    }

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        // Set the last exception in the sync block to ensure the ordering with add.
        // either this gets done and the add does the ml.error
        // or the add completes first and the iterator below will do ml.error
        synchronized (_frameListeners)
        {
            _lastFailoverException = new FailoverException("Failing over about to start");
        }


        //Only notify the Frame listeners that failover is going to occur as the State listeners shouldn't be
        // interupted unless failover cannot restore the state.
        propagateExceptionToFrameListeners(_lastFailoverException);

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        // Set the last exception in the sync block to ensure the ordering with add.
        // either this gets done and the add does the ml.error
        // or the add completes first and the iterator below will do ml.error
        synchronized (_frameListeners)
        {
            _lastFailoverException = new FailoverException("Failing over about to start");
        }


        //Only notify the Frame listeners that failover is going to occur as the State listeners shouldn't be
        // interrupted unless failover cannot restore the state.
        propagateExceptionToFrameListeners(_lastFailoverException);

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        // Set the last exception in the sync block to ensure the ordering with add.
        // either this gets done and the add does the ml.error
        // or the add completes first and the iterator below will do ml.error
        synchronized (_frameListeners)
        {
            _lastFailoverException = new FailoverException("Failing over about to start");
        }


        //Only notify the Frame listeners that failover is going to occur as the State listeners shouldn't be
        // interrupted unless failover cannot restore the state.
        propagateExceptionToFrameListeners(_lastFailoverException);

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        // Set the last exception in the sync block to ensure the ordering with add.
        // either this gets done and the add does the ml.error
        // or the add completes first and the iterator below will do ml.error
        synchronized (_frameListeners)
        {
            _lastFailoverException = new FailoverException("Failing over about to start");
        }


        //Only notify the Frame listeners that failover is going to occur as the State listeners shouldn't be
        // interrupted unless failover cannot restore the state.
        propagateExceptionToFrameListeners(_lastFailoverException);

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        _amqProtocolHandler.setFailoverLatch(new CountDownLatch(1));


        // We wake up listeners. If they can handle failover, they will extend the
        // FailoverSupport class and will in turn block on the latch until failover
        // has completed before retrying the operation
        _amqProtocolHandler.propagateExceptionToWaiters(new FailoverException("Failing over about to start"));


        // Since failover impacts several structures we protect them all with a single mutex. These structures
        // are also in child objects of the connection. This allows us to manipulate them without affecting
        // client code which runs in a separate thread.
        synchronized (_amqProtocolHandler.getConnection().getFailoverMutex())

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Related Classes of org.apache.qpid.client.failover.FailoverException

org.apache.qpid.client.AMQConnectionDelegate_0_10

org.apache.qpid.client.failover.FailoverHandler

org.apache.qpid.client.protocol.AMQProtocolHandler

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