public void testReplace() throws Exception {
cache(0).put("myKey", "myValue");
// add an interceptor on second node that will block REPLACE commands right after
// EntryWrappingInterceptor until we are ready
final CountDownLatch replaceStartedLatch = new CountDownLatch(1);
final CountDownLatch replaceProceedLatch = new CountDownLatch(1);
boolean isVersioningEnabled = cache(0).getCacheConfiguration().versioning().enabled();
cacheConfigBuilder
.customInterceptors()
.addInterceptor()
.after(
isVersioningEnabled
? VersionedEntryWrappingInterceptor.class
: EntryWrappingInterceptor.class)
.interceptor(
new CommandInterceptor() {
@Override
protected Object handleDefault(InvocationContext ctx, VisitableCommand cmd)
throws Throwable {
if (cmd instanceof ReplaceCommand) {
// signal we encounter a REPLACE
replaceStartedLatch.countDown();
// wait until it is ok to continue with REPLACE
if (!replaceProceedLatch.await(15, TimeUnit.SECONDS)) {
throw new TimeoutException();
}
}
return super.handleDefault(ctx, cmd);
}
});
// do not allow coordinator to send topology updates to node B
final ClusterTopologyManager ctm0 =
TestingUtil.extractGlobalComponent(manager(0), ClusterTopologyManager.class);
ctm0.setRebalancingEnabled(false);
log.info("Adding a new node ..");
addClusterEnabledCacheManager(cacheConfigBuilder);
log.info("Added a new node");
// node B is not a member yet and rebalance has not started yet
CacheTopology cacheTopology =
advancedCache(1).getComponentRegistry().getStateTransferManager().getCacheTopology();
assertNull(cacheTopology.getPendingCH());
assertTrue(cacheTopology.getMembers().contains(address(0)));
assertFalse(cacheTopology.getMembers().contains(address(1)));
assertFalse(cacheTopology.getCurrentCH().getMembers().contains(address(1)));
// no keys should be present on node B yet because state transfer is blocked
assertTrue(cache(1).keySet().isEmpty());
// initiate a REPLACE
Future<Object> getFuture =
fork(
new Callable<Object>() {
@Override
public Object call() throws Exception {
try {
return cache(1).replace("myKey", "newValue");
} catch (Exception e) {
log.errorf(e, "REPLACE failed: %s", e.getMessage());
throw e;
}
}
});
// wait for REPLACE command on node B to reach beyond *EntryWrappingInterceptor, where it will
// block.
// the value seen so far is null
if (!replaceStartedLatch.await(15, TimeUnit.SECONDS)) {
throw new TimeoutException();
}
// paranoia, yes the value is still missing from data container
assertTrue(cache(1).keySet().isEmpty());
// allow rebalance to start
ctm0.setRebalancingEnabled(true);
// wait for state transfer to end
TestingUtil.waitForRehashToComplete(cache(0), cache(1));
// the state should be already transferred now
assertEquals(1, cache(1).keySet().size());
// allow REPLACE to continue
replaceProceedLatch.countDown();
Object oldVal = getFuture.get(15, TimeUnit.SECONDS);
assertNotNull(oldVal);
assertEquals("myValue", oldVal);
assertEquals("newValue", cache(0).get("myKey"));
assertEquals("newValue", cache(1).get("myKey"));
}
