public void testCancelWhilePendingWithTwoClients()
throws InterruptedException, ExecutionException {
// Request data from cache. Use an additional invokeAndWait to
// ensure both update requests are initiated before we wait
// for retrieval to start
Query<Integer> q1 = new TestQuery();
q1.invoke();
Protocol.invokeAndWait(
new Runnable() {
public void run() {}
});
// Request data from cache again
Query<Integer> q2 = new TestQuery();
q2.invoke();
Protocol.invokeAndWait(
new Runnable() {
public void run() {}
});
// Wait until the cache starts data retrieval.
waitForRetrieveRm();
// Cancel the first client request
q1.cancel(true);
try {
q1.get();
Assert.fail("Expected a cancellation exception");
} catch (CancellationException e) {
} // Expected exception;
assertCacheWaiting();
// Cancel the second request
q2.cancel(true);
try {
q2.get();
Assert.fail("Expected a cancellation exception");
} catch (CancellationException e) {
} // Expected exception;
assertCacheInvalidAndWithCanceledRM();
// Completed the retrieve RM
Protocol.invokeAndWait(
new Runnable() {
public void run() {
fRetrieveRm.setData(1);
fRetrieveRm.done();
}
});
// Validate that cache didn't accept the result after its RM was canceled
assertCacheInvalidAndWithCanceledRM();
}
public void testCancelWhilePending3() throws InterruptedException, ExecutionException {
// Request data from cache
Query<Integer> q = new TestQuery();
q.invoke();
// Wait until the cache starts data retrieval.
waitForRetrieveRm();
// Cancel the client request
q.cancel(true);
try {
q.get();
Assert.fail("Expected a cancellation exception");
} catch (CancellationException e) {
} // Expected exception;
assertCacheInvalidAndWithCanceledRM();
// Simulate retrieval logic that is regularly checking the RM's cancel
// status and has discovered that the request has been canceled. It
// aborts its processing, sets STATUS.CANCEL_STATUS in the RM and
// completes it.
Protocol.invokeAndWait(
new Runnable() {
public void run() {
fRetrieveRm.setError(new CancellationException());
fRetrieveRm.done();
}
});
// Validate that cache didn't accept the result after its RM was canceled
assertCacheInvalidAndWithCanceledRM();
}
public void testCancelWhilePending2() throws InterruptedException, ExecutionException {
// Request data from cache
Query<Integer> q = new TestQuery();
q.invoke();
// Wait until the cache starts data retrieval.
waitForRetrieveRm();
// Cancel the client request
q.cancel(true);
try {
q.get();
Assert.fail("Expected a cancellation exception");
} catch (CancellationException e) {
} // Expected exception;
assertCacheInvalidAndWithCanceledRM();
// Simulate retrieval logic that is regularly checking the RM's cancel
// status and has discovered that the request has been canceled. It
// technically does not need to explicitly set a cancel status object in
// the RM, thanks to RequestMonitor.getStatus() automatically returning
// Status.CANCEL_STATUS when its in the cancel state. So here we
// simulate the retrieval logic just aborting its operations and
// completing the RM. Note that it hasn't provided the data to the
// cache.
Protocol.invokeAndWait(
new Runnable() {
public void run() {
fRetrieveRm.done();
}
});
assertCacheInvalidAndWithCanceledRM();
}
public void testCancelWhilePending() throws InterruptedException, ExecutionException {
// Request data from cache
Query<Integer> q = new TestQuery();
q.invoke();
// Wait until the cache starts data retrieval.
waitForRetrieveRm();
// Cancel the client request
q.cancel(true);
try {
q.get();
Assert.fail("Expected a cancellation exception");
} catch (CancellationException e) {
} // Expected exception;
assertCacheInvalidAndWithCanceledRM();
// Simulate the retrieval completing successfully despite the cancel
// request. Perhaps the retrieval logic isn't checking the RM status.
// Even if it is checking, it may have gotten passed its last checkpoint
Protocol.invokeAndWait(
new Runnable() {
public void run() {
fRetrieveRm.setData(1);
fRetrieveRm.done();
}
});
// Validate that cache didn't accept the result after its RM was canceled
assertCacheInvalidAndWithCanceledRM();
}
public void testCancelWhilePendingWithManyClients()
throws InterruptedException, ExecutionException {
// Request data from cache
List<Query<Integer>> qList = new ArrayList<Query<Integer>>();
for (int i = 0; i < 10; i++) {
Query<Integer> q = new TestQuery();
q.invoke();
Protocol.invokeAndWait(
new Runnable() {
public void run() {}
});
qList.add(q);
}
// Wait until the cache starts data retrieval.
waitForRetrieveRm();
// Cancel some client requests
int[] toCancel = new int[] {0, 2, 5, 9};
for (int i = 0; i < toCancel.length; i++) {
// Cancel request and verify that its canceled
Query<Integer> q = qList.get(toCancel[i]);
q.cancel(true);
try {
q.get();
Assert.fail("Expected a cancellation exception");
} catch (CancellationException e) {
} // Expected exception;
qList.set(toCancel[i], null);
assertCacheWaiting();
}
// Replace canceled requests with new ones
for (int i = 0; i < toCancel.length; i++) {
Query<Integer> q = new TestQuery();
q.invoke();
Protocol.invokeAndWait(
new Runnable() {
public void run() {}
});
qList.set(toCancel[i], q);
assertCacheWaiting();
}
// Now cancel all requests
for (int i = 0; i < (qList.size() - 1); i++) {
// Validate that cache is still waiting and is not canceled
assertCacheWaiting();
qList.get(i).cancel(true);
}
qList.get(qList.size() - 1).cancel(true);
assertCacheInvalidAndWithCanceledRM();
// Completed the retrieve RM
Protocol.invokeAndWait(
new Runnable() {
public void run() {
fRetrieveRm.setData(1);
fRetrieveRm.done();
}
});
// Validate that cache didn't accept the result after its RM was canceled
assertCacheInvalidAndWithCanceledRM();
}
public void testCancelWhilePendingWithoutClientNotification()
throws InterruptedException, ExecutionException {
final boolean canceledCalled[] = new boolean[] {false};
fTestCache =
new TestCache() {
protected synchronized void canceled() {
canceledCalled[0] = true;
};
};
// Request data from cache
Query<Integer> q =
new Query<Integer>() {
@Override
protected void execute(final DataCallback<Integer> rm) {
fTestCache.wait(
new Callback(rm) {
@Override
public synchronized void addCancelListener(ICanceledListener listener) {
// Do not add the cancel listener so that the cancel request is not
// propagated to the cache.
}
@Override
protected void handleSuccess() {
rm.setData(fTestCache.getData());
rm.done();
}
});
}
};
q.invoke();
// Wait until the cache starts data retrieval.
waitForRetrieveRm();
// Cancel the client request
q.cancel(true);
assertCacheInvalidAndWithCanceledRM();
// AbstractCache.canceled() should be called after isCanceled()
// discovers that the client has canceled its request. The canceled() method is
// called in a separate dispatch cycle, so we have to wait one cycle of the executor
// after is canceled is called.
fRetrieveRm.isCanceled();
Protocol.invokeAndWait(
new Runnable() {
public void run() {}
});
Assert.assertTrue(canceledCalled[0]);
try {
q.get();
Assert.fail("Expected a cancellation exception");
} catch (CancellationException e) {
} // Expected exception;
// Completed the retrieve RM
Protocol.invokeAndWait(
new Runnable() {
public void run() {
fRetrieveRm.setData(1);
fRetrieveRm.done();
}
});
// Validate that cache didn't accept the result after its RM was canceled
assertCacheInvalidAndWithCanceledRM();
}