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The core JMS Client implementation
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.qpid.jms.provider.amqp;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.MODIFIED_FAILED;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.MODIFIED_FAILED_UNDELIVERABLE;
import static org.apache.qpid.jms.provider.amqp.AmqpSupport.REJECTED;
import java.util.ArrayList;
import java.util.ListIterator;
import java.util.concurrent.ScheduledFuture;
import jakarta.jms.Session;
import org.apache.qpid.jms.JmsDestination;
import org.apache.qpid.jms.message.JmsInboundMessageDispatch;
import org.apache.qpid.jms.message.JmsMessage;
import org.apache.qpid.jms.meta.JmsConsumerId;
import org.apache.qpid.jms.meta.JmsConsumerInfo;
import org.apache.qpid.jms.provider.AsyncResult;
import org.apache.qpid.jms.provider.ProviderConstants.ACK_TYPE;
import org.apache.qpid.jms.provider.ProviderException;
import org.apache.qpid.jms.provider.ProviderListener;
import org.apache.qpid.jms.provider.WrappedAsyncResult;
import org.apache.qpid.jms.provider.amqp.message.AmqpCodec;
import org.apache.qpid.jms.provider.exceptions.ProviderExceptionSupport;
import org.apache.qpid.jms.provider.exceptions.ProviderOperationTimedOutException;
import org.apache.qpid.proton.amqp.Binary;
import org.apache.qpid.proton.amqp.messaging.Accepted;
import org.apache.qpid.proton.amqp.messaging.Released;
import org.apache.qpid.proton.amqp.transport.DeliveryState;
import org.apache.qpid.proton.engine.Delivery;
import org.apache.qpid.proton.engine.Receiver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* AMQP Consumer object that is used to manage JMS MessageConsumer semantics.
*/
public class AmqpConsumer extends AmqpAbstractResource {
private static final Logger LOG = LoggerFactory.getLogger(AmqpConsumer.class);
private static final int INDIVIDUAL_ACKNOWLEDGE = 101;
protected final AmqpSession session;
protected final int acknowledgementMode;
protected AsyncResult stopRequest;
protected AsyncResult pullRequest;
protected long incomingSequence;
protected int deliveredCount;
protected int dispatchedCount;
protected boolean deferredClose;
public AmqpConsumer(AmqpSession session, JmsConsumerInfo info, Receiver receiver) {
super(info, receiver, session);
this.session = session;
this.acknowledgementMode = info.getAcknowledgementMode();
}
@Override
public void close(AsyncResult request) {
acknowledgeUndeliveredRecoveredMessages();
// If we have pending deliveries we remain open to allow for ACK or for a
// pending transaction that this consumer is active in to complete.
if (shouldDeferClose()) {
deferredClose = true;
stop(new StopAndReleaseRequest(request));
} else {
super.close(request);
}
}
private void acknowledgeUndeliveredRecoveredMessages() {
if (acknowledgementMode == Session.CLIENT_ACKNOWLEDGE
|| acknowledgementMode == Session.AUTO_ACKNOWLEDGE
|| acknowledgementMode == Session.DUPS_OK_ACKNOWLEDGE
|| acknowledgementMode == INDIVIDUAL_ACKNOWLEDGE) {
// Send dispositions for any messages which were previously delivered and
// session recovered, but were then not delivered again afterwards.
Delivery delivery = getEndpoint().head();
while (delivery != null) {
Delivery current = delivery;
delivery = delivery.next();
if (!(current.getContext() instanceof JmsInboundMessageDispatch)) {
continue;
}
JmsInboundMessageDispatch envelope = (JmsInboundMessageDispatch) current.getContext();
if (envelope.isRecovered() && !envelope.isDelivered()) {
handleDisposition(envelope, current, MODIFIED_FAILED);
}
}
}
}
/**
* Starts the consumer by setting the link credit to the given prefetch value.
*
* @param request
* The request that awaits completion of the consumer start.
*/
public void start(AsyncResult request) {
JmsConsumerInfo consumerInfo = getResourceInfo();
if (consumerInfo.isListener() && consumerInfo.getPrefetchSize() == 0) {
sendFlowForNoPrefetchListener();
} else {
sendFlowIfNeeded();
}
request.onSuccess();
}
/**
* Stops the consumer, using all link credit and waiting for in-flight messages to arrive.
*
* @param request
* The request that awaits completion of the consumer stop.
*/
public void stop(AsyncResult request) {
Receiver receiver = getEndpoint();
if (receiver.getRemoteCredit() <= 0) {
if (receiver.getQueued() == 0) {
// We have no remote credit and all the deliveries have been processed.
request.onSuccess();
} else {
// There are still deliveries to process, wait for them to be.
if (getDrainTimeout() > 0) {
// If the remote doesn't respond we will close the consumer and break any
// blocked receive or stop calls that are waiting, unless the consumer is
// a participant in a transaction in which case we will just fail the request
// and leave the consumer open since the TX needs it to remain active.
final ScheduledFuture future = getSession().schedule(() -> {
LOG.trace("Consumer {} stop timed out awaiting message processing", getConsumerId());
ProviderException cause = new ProviderOperationTimedOutException("Consumer stop timed out awaiting message processing");
if (session.isTransacted() && session.getTransactionContext().isInTransaction(getConsumerId())) {
stopRequest.onFailure(cause);
stopRequest = null;
} else {
closeResource(session.getProvider(), cause, false);
session.getProvider().pumpToProtonTransport();
}
}, getDrainTimeout());
stopRequest = new ScheduledRequest(future, request);
} else {
stopRequest = request;
}
LOG.trace("Consumer {} stop awaiting queued delivery processing", getConsumerId());
}
} else {
// TODO: We don't actually want the additional messages that could be sent while
// draining. We could explicitly reduce credit first, or possibly use 'echo' instead
// of drain if it was supported. We would first need to understand what happens
// if we reduce credit below the number of messages already in-flight before
// the peer sees the update.
stopRequest = request;
receiver.drain(0);
if (getDrainTimeout() > 0) {
// If the remote doesn't respond we will close the consumer and break any
// blocked receive or stop calls that are waiting, unless the consumer is
// a participant in a transaction in which case we will just fail the request
// and leave the consumer open since the TX needs it to remain active.
final ScheduledFuture future = getSession().schedule(() -> {
LOG.trace("Consumer {} drain request timed out", getConsumerId());
ProviderException cause = new ProviderOperationTimedOutException("Remote did not respond to a drain request in time");
if (session.isTransacted() && session.getTransactionContext().isInTransaction(getConsumerId())) {
stopRequest.onFailure(cause);
stopRequest = null;
} else {
closeResource(session.getProvider(), cause, false);
session.getProvider().pumpToProtonTransport();
}
}, getDrainTimeout());
stopRequest = new ScheduledRequest(future, stopRequest);
}
}
}
private void stopOnSchedule(long timeout, final AsyncResult request) {
LOG.trace("Consumer {} scheduling stop", getConsumerId());
// We need to drain the credit if no message(s) arrive to use it.
final ScheduledFuture future = getSession().schedule(() -> {
LOG.trace("Consumer {} running scheduled stop", getConsumerId());
stop(request);
session.getProvider().pumpToProtonTransport(request);
}, timeout);
stopRequest = new ScheduledRequest(future, request);
}
@Override
public void processFlowUpdates(AmqpProvider provider) throws ProviderException {
// Check if we tried to stop and have now run out of credit, and
// processed all locally queued messages
if (stopRequest != null) {
Receiver receiver = getEndpoint();
if (receiver.getRemoteCredit() <= 0 && receiver.getQueued() == 0) {
stopRequest.onSuccess();
stopRequest = null;
}
}
if (pullRequest != null) {
Receiver receiver = getEndpoint();
if (receiver.getRemoteCredit() <= 0 && receiver.getQueued() == 0) {
pullRequest.onSuccess();
pullRequest = null;
}
}
LOG.trace("Consumer {} flow updated, remote credit = {}", getConsumerId(), getEndpoint().getRemoteCredit());
super.processFlowUpdates(provider);
}
/**
* Called to acknowledge all messages that have been marked as delivered but
* have not yet been marked consumed. Usually this is called as part of an
* client acknowledge session operation.
*
* Only messages that have already been acknowledged as delivered by the JMS
* framework will be in the delivered Map. This means that the link credit
* would already have been given for these so we just need to settle them.
*
* @param ackType the type of acknowledgement to perform
*/
public void acknowledge(ACK_TYPE ackType) {
LOG.trace("Session Acknowledge for consumer {} with ack type {}", getResourceInfo().getId(), ackType);
Delivery delivery = getEndpoint().head();
while (delivery != null) {
Delivery current = delivery;
delivery = delivery.next();
if (!(current.getContext() instanceof JmsInboundMessageDispatch)) {
LOG.debug("{} Found incomplete delivery with no context during session acknowledge processing", AmqpConsumer.this);
continue;
}
JmsInboundMessageDispatch envelope = (JmsInboundMessageDispatch) current.getContext();
if (ackType == ACK_TYPE.SESSION_SHUTDOWN && (envelope.isDelivered() || envelope.isRecovered())) {
handleDisposition(envelope, current, MODIFIED_FAILED);
} else if (envelope.isDelivered()) {
final DeliveryState disposition;
switch (ackType) {
case ACCEPTED:
disposition = Accepted.getInstance();
break;
case RELEASED:
disposition = Released.getInstance();
break;
case REJECTED:
disposition = REJECTED;
break;
case MODIFIED_FAILED:
disposition = MODIFIED_FAILED;
break;
case MODIFIED_FAILED_UNDELIVERABLE:
disposition = MODIFIED_FAILED_UNDELIVERABLE;
break;
default:
throw new IllegalArgumentException("Invalid acknowledgement type specified: " + ackType);
}
handleDisposition(envelope, current, disposition);
}
}
tryCompleteDeferredClose();
}
/**
* Called to acknowledge a given delivery.
*
* @param envelope
* the delivery that is to be acknowledged.
* @param ackType
* the type of acknowledgement to perform.
*/
public void acknowledge(JmsInboundMessageDispatch envelope, ACK_TYPE ackType) {
Delivery delivery = null;
if (envelope.getProviderHint() instanceof Delivery) {
delivery = (Delivery) envelope.getProviderHint();
} else {
LOG.warn("Received Ack for unknown message: {}", envelope);
return;
}
switch (ackType) {
case DELIVERED:
handleDelivered(envelope, delivery);
break;
case ACCEPTED:
handleAccepted(envelope, delivery);
break;
case REJECTED:
handleDisposition(envelope, delivery, REJECTED);
break;
case RELEASED:
handleDisposition(envelope, delivery, Released.getInstance());
break;
case MODIFIED_FAILED:
handleDisposition(envelope, delivery, MODIFIED_FAILED);
break;
case MODIFIED_FAILED_UNDELIVERABLE:
handleDisposition(envelope, delivery, MODIFIED_FAILED_UNDELIVERABLE);
break;
default:
LOG.warn("Unsupported Ack Type for message: {}", envelope);
throw new IllegalArgumentException("Unknown Acknowledgement type");
}
sendFlowIfNeeded();
tryCompleteDeferredClose();
}
private void handleDelivered(JmsInboundMessageDispatch envelope, Delivery delivery) {
LOG.debug("Delivered Ack of message: {}", envelope);
deliveredCount++;
envelope.setRecovered(false);
envelope.setDelivered(true);
delivery.setDefaultDeliveryState(MODIFIED_FAILED);
}
private void handleAccepted(JmsInboundMessageDispatch envelope, Delivery delivery) {
LOG.debug("Accepted Ack of message: {}", envelope);
if (!delivery.remotelySettled()) {
if (session.isTransacted() && !getResourceInfo().isBrowser()) {
if (session.isTransactionInDoubt()) {
LOG.trace("Skipping ack of message {} in failed transaction.", envelope);
return;
}
Binary txnId = session.getTransactionContext().getAmqpTransactionId();
if (txnId != null) {
delivery.disposition(session.getTransactionContext().getTxnAcceptState());
delivery.settle();
session.getTransactionContext().registerTxConsumer(this);
}
} else {
delivery.disposition(Accepted.getInstance());
delivery.settle();
}
} else {
delivery.settle();
}
if (envelope.isDelivered()) {
deliveredCount--;
}
dispatchedCount--;
}
private void handleDisposition(JmsInboundMessageDispatch envelope, Delivery delivery, DeliveryState outcome) {
delivery.disposition(outcome);
delivery.settle();
if (envelope.isDelivered()) {
deliveredCount--;
}
dispatchedCount--;
}
/**
* We only send more credits as the credit window dwindles to a certain point and
* then we open the window back up to full prefetch size. If this is a pull consumer
* or we are stopping then we never send credit here.
*/
private void sendFlowIfNeeded() {
int prefetchSize = getResourceInfo().getPrefetchSize();
if (prefetchSize == 0 || isStopping()) {
// TODO: isStopping isn't effective when this method is called following
// processing the last of any messages received while stopping, since that
// happens just after we stopped. That may be ok in some situations however, and
// if will only happen if prefetchSize != 0.
return;
}
int currentCredit = getEndpoint().getCredit();
if (currentCredit <= prefetchSize * 0.5) {
int potentialPrefetch = currentCredit + (dispatchedCount - deliveredCount);
if (potentialPrefetch <= prefetchSize * 0.7) {
int additionalCredit = prefetchSize - potentialPrefetch;
LOG.trace("Consumer {} granting additional credit: {}", getConsumerId(), additionalCredit);
getEndpoint().flow(additionalCredit);
}
}
}
private void sendFlowForNoPrefetchListener() {
int currentCredit = getEndpoint().getCredit();
if (currentCredit < 1) {
int additionalCredit = 1 - currentCredit;
LOG.trace("Consumer {} granting additional credit: {}", getConsumerId(), additionalCredit);
getEndpoint().flow(additionalCredit);
}
}
/**
* Recovers all previously delivered but not acknowledged messages.
*
* @throws Exception if an error occurs while performing the recover.
*/
public void recover() throws Exception {
LOG.debug("Session Recover for consumer: {}", getResourceInfo().getId());
ArrayList redispatchList = new ArrayList();
Delivery delivery = getEndpoint().head();
while (delivery != null) {
Delivery current = delivery;
delivery = delivery.next();
if (!(current.getContext() instanceof JmsInboundMessageDispatch)) {
LOG.debug("{} Found incomplete delivery with no context during recover processing", AmqpConsumer.this);
continue;
}
JmsInboundMessageDispatch envelope = (JmsInboundMessageDispatch) current.getContext();
if (envelope.isDelivered()) {
envelope.getMessage().getFacade().setRedeliveryCount(
envelope.getMessage().getFacade().getRedeliveryCount() + 1);
envelope.setEnqueueFirst(true);
envelope.setDelivered(false);
envelope.setRecovered(true);
redispatchList.add(envelope);
}
}
// Previously delivered messages should be tagged as dispatched messages again so we
// can properly compute the next credit refresh, so subtract them from both the delivered
// and dispatched counts and then dispatch them again as a new message.
deliveredCount -= redispatchList.size();
dispatchedCount -= redispatchList.size();
ListIterator reverseIterator = redispatchList.listIterator(redispatchList.size());
while (reverseIterator.hasPrevious()) {
deliver(reverseIterator.previous());
}
if (deferredClose) {
acknowledgeUndeliveredRecoveredMessages();
tryCompleteDeferredClose();
}
}
/**
* Request a remote peer send a Message to this client.
*
* {@literal timeout < 0} then it should remain open until a message is received.
* {@literal timeout = 0} then it returns a message or null if none available
* {@literal timeout > 0} then it should remain open for timeout amount of time.
*
* The timeout value when positive is given in milliseconds.
*
* @param timeout
* the amount of time to tell the remote peer to keep this pull request valid.
* @param request
* the asynchronous request object waiting to be notified of the pull having completed.
*/
public void pull(final long timeout, final AsyncResult request) {
LOG.trace("Pull on consumer {} with timeout = {}", getConsumerId(), timeout);
if (timeout < 0) {
// Wait until message arrives. Just give credit if needed.
if (getEndpoint().getCredit() == 0) {
LOG.trace("Consumer {} granting 1 additional credit for pull.", getConsumerId());
getEndpoint().flow(1);
}
// Await the message arrival
pullRequest = request;
} else if (timeout == 0) {
// If we have no credit then we need to issue some so that we can
// try to fulfill the request, then drain down what is there to
// ensure we consume what is available and remove all credit.
if (getEndpoint().getCredit() == 0){
LOG.trace("Consumer {} granting 1 additional credit for pull.", getConsumerId());
getEndpoint().flow(1);
}
// Drain immediately and wait for the message(s) to arrive,
// or a flow indicating removal of the remaining credit.
stop(request);
} else if (timeout > 0) {
// If we have no credit then we need to issue some so that we can
// try to fulfill the request, then drain down what is there to
// ensure we consume what is available and remove all credit.
if (getEndpoint().getCredit() == 0) {
LOG.trace("Consumer {} granting 1 additional credit for pull.", getConsumerId());
getEndpoint().flow(1);
}
// Wait for the timeout for the message(s) to arrive, then drain if required
// and wait for remaining message(s) to arrive or a flow indicating
// removal of the remaining credit.
stopOnSchedule(timeout, request);
}
}
@Override
public void processDeliveryUpdates(AmqpProvider provider, Delivery delivery) throws ProviderException {
if (delivery.getDefaultDeliveryState() == null){
delivery.setDefaultDeliveryState(Released.getInstance());
}
if (delivery.isReadable() && !delivery.isPartial()) {
LOG.trace("{} has incoming Message(s).", this);
try {
if (processDelivery(delivery)) {
// We processed a message, signal completion
// of a message pull request if there is one.
if (pullRequest != null) {
pullRequest.onSuccess();
pullRequest = null;
}
}
} catch (Exception e) {
throw ProviderExceptionSupport.createNonFatalOrPassthrough(e);
}
}
if (getEndpoint().current() == null) {
// We have exhausted the locally queued messages on this link.
// Check if we tried to stop and have now run out of credit.
if (getEndpoint().getRemoteCredit() <= 0) {
if (stopRequest != null) {
stopRequest.onSuccess();
stopRequest = null;
}
}
}
super.processDeliveryUpdates(provider, delivery);
}
private boolean processDelivery(Delivery incoming) throws Exception {
JmsMessage message = null;
try {
message = AmqpCodec.decodeMessage(this, getEndpoint().recv()).asJmsMessage();
} catch (Exception e) {
LOG.warn("Error on transform: {}", e.getMessage());
// TODO - We could signal provider error but not sure we want to fail
// the connection just because we can't convert the message.
// In the future once the JMS mapping is complete we should be
// able to convert everything to some message even if its just
// a bytes messages as a fall back.
incoming.disposition(MODIFIED_FAILED_UNDELIVERABLE);
incoming.settle();
// TODO: this flows credit, which we might not want, e.g if
// a drain was issued to stop the link.
sendFlowIfNeeded();
return false;
}
try {
// Let the message do any final processing before sending it onto a consumer.
// We could defer this to a later stage such as the JmsConnection or even in
// the JmsMessageConsumer dispatch method if we needed to.
message.onDispatch();
JmsInboundMessageDispatch envelope = new JmsInboundMessageDispatch(getNextIncomingSequenceNumber());
envelope.setMessage(message);
envelope.setConsumerId(getResourceInfo().getId());
envelope.setConsumerInfo(getResourceInfo());
// Store link to delivery in the hint for use in acknowledge requests.
envelope.setProviderHint(incoming);
envelope.setMessageId(message.getFacade().getProviderMessageIdObject());
// Store reference to envelope in delivery context for recovery
incoming.setContext(envelope);
deliver(envelope);
return true;
} finally {
getEndpoint().advance();
}
}
protected long getNextIncomingSequenceNumber() {
return ++incomingSequence;
}
@Override
protected void closeOrDetachEndpoint() {
if (getResourceInfo().isDurable()) {
getEndpoint().detach();
} else {
getEndpoint().close();
}
}
public AmqpConnection getConnection() {
return session.getConnection();
}
public AmqpSession getSession() {
return session;
}
public JmsConsumerId getConsumerId() {
return this.getResourceInfo().getId();
}
public JmsDestination getDestination() {
return this.getResourceInfo().getDestination();
}
public boolean isStopping() {
return stopRequest != null;
}
public int getDrainTimeout() {
return session.getProvider().getDrainTimeout();
}
@Override
public String toString() {
return "AmqpConsumer { " + getResourceInfo().getId() + " }";
}
protected void deliver(JmsInboundMessageDispatch envelope) throws Exception {
if (!deferredClose) {
ProviderListener listener = session.getProvider().getProviderListener();
if (listener != null) {
LOG.debug("Dispatching received message: {}", envelope);
dispatchedCount++;
listener.onInboundMessage(envelope);
} else {
LOG.error("Provider listener is not set, message will be dropped: {}", envelope);
}
}
}
public void preCommit() {
}
public void preRollback() {
}
public void postCommit() {
tryCompleteDeferredClose();
}
public void postRollback() {
releasePrefetch();
tryCompleteDeferredClose();
}
@Override
public void handleResourceClosure(AmqpProvider provider, ProviderException cause) {
AmqpConnection connection = session.getConnection();
AmqpSubscriptionTracker subTracker = connection.getSubTracker();
JmsConsumerInfo consumerInfo = getResourceInfo();
subTracker.consumerRemoved(consumerInfo);
// When closed we need to release any pending tasks to avoid blocking
if (stopRequest != null) {
if (cause == null) {
stopRequest.onSuccess();
} else {
stopRequest.onFailure(cause);
}
stopRequest = null;
}
if (pullRequest != null) {
if (cause == null) {
pullRequest.onSuccess();
} else {
pullRequest.onFailure(cause);
}
pullRequest = null;
}
}
private boolean shouldDeferClose() {
if (getSession().isTransacted() && getSession().getTransactionContext().isInTransaction(getConsumerId())) {
return true;
}
if (deliveredCount > 0) {
return true;
}
return false;
}
private void tryCompleteDeferredClose() {
if (deferredClose && deliveredCount == 0) {
super.close(new DeferredCloseRequest());
}
}
private void releasePrefetch() {
Delivery delivery = getEndpoint().head();
while (delivery != null) {
Delivery current = delivery;
delivery = delivery.next();
if (current.getContext() instanceof JmsInboundMessageDispatch) {
JmsInboundMessageDispatch envelope = (JmsInboundMessageDispatch) current.getContext();
if (!envelope.isDelivered()) {
handleDisposition(envelope, current, Released.getInstance());
}
} else {
LOG.debug("{} Found incomplete delivery with no context during release processing", AmqpConsumer.this);
}
}
}
//----- Inner class used to report on deferred close ---------------------//
private final class StopAndReleaseRequest extends WrappedAsyncResult {
public StopAndReleaseRequest(AsyncResult closeRequest) {
super(closeRequest);
}
@Override
public void onSuccess() {
// Now that the link is drained we can release all the prefetched
// messages so that the remote can send them elsewhere.
releasePrefetch();
super.onSuccess();
}
}
//----- Inner class used to report on deferred close ---------------------//
private final class DeferredCloseRequest implements AsyncResult {
@Override
public void onFailure(ProviderException result) {
LOG.trace("Failed deferred close of consumer: {} - {}", getConsumerId(), result.getMessage());
getParent().getProvider().fireNonFatalProviderException(ProviderExceptionSupport.createNonFatalOrPassthrough(result));
}
@Override
public void onSuccess() {
LOG.trace("Completed deferred close of consumer: {}", getConsumerId());
}
@Override
public boolean isComplete() {
return isClosed();
}
}
//----- Inner class used in message pull operations ----------------------//
private static final class ScheduledRequest implements AsyncResult {
private final ScheduledFuture sheduledTask;
private final AsyncResult origRequest;
public ScheduledRequest(ScheduledFuture completionTask, AsyncResult origRequest) {
this.sheduledTask = completionTask;
this.origRequest = origRequest;
}
@Override
public void onFailure(ProviderException cause) {
sheduledTask.cancel(false);
origRequest.onFailure(cause);
}
@Override
public void onSuccess() {
boolean cancelled = sheduledTask.cancel(false);
if (cancelled) {
// Signal completion. Otherwise wait for the scheduled task to do it.
origRequest.onSuccess();
}
}
@Override
public boolean isComplete() {
return origRequest.isComplete();
}
}
}