Examples with CurrentStateChangeListener org.apache.helix.CurrentStateChangeListener used on opensource projects

Example 1 with CurrentStateChangeListener

use of org.apache.helix.CurrentStateChangeListener in project helix by apache.

the class TestZkCallbackHandlerLeak method testRemoveUserCbHdlrOnPathRemoval.

@Test
public void testRemoveUserCbHdlrOnPathRemoval() throws Exception {
    String className = TestHelper.getTestClassName();
    String methodName = TestHelper.getTestMethodName();
    String clusterName = className + "_" + methodName;
    final int n = 3;
    final String zkAddr = ZK_ADDR;
    System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
    // resource
    TestHelper.setupCluster(// resource
    clusterName, // resource
    zkAddr, // resource
    12918, // resource
    "localhost", // resource
    "TestDB", // resource
    1, // partitions
    32, // nodes
    n, // replicas
    2, "MasterSlave", true);
    final ClusterControllerManager controller = new ClusterControllerManager(zkAddr, clusterName, "controller");
    controller.syncStart();
    MockParticipantManager[] participants = new MockParticipantManager[n];
    for (int i = 0; i < n; i++) {
        String instanceName = "localhost_" + (12918 + i);
        participants[i] = new MockParticipantManager(zkAddr, clusterName, instanceName);
        participants[i].syncStart();
        // register a controller listener on participant_0
        if (i == 0) {
            MockParticipantManager manager = participants[0];
            manager.addCurrentStateChangeListener(new CurrentStateChangeListener() {

                @Override
                public void onStateChange(String instanceName, List<CurrentState> statesInfo, NotificationContext changeContext) {
                // To change body of implemented methods use File | Settings | File Templates.
                // System.out.println(instanceName + " on current-state change, type: " +
                // changeContext.getType());
                }
            }, manager.getInstanceName(), manager.getSessionId());
        }
    }
    HelixClusterVerifier verifier = new BestPossibleExternalViewVerifier.Builder(clusterName).setZkAddr(zkAddr).build();
    Assert.assertTrue(verifier.verify());
    MockParticipantManager participantToExpire = participants[0];
    String oldSessionId = participantToExpire.getSessionId();
    PropertyKey.Builder keyBuilder = new PropertyKey.Builder(clusterName);
    // check manager#hanlders
    Assert.assertEquals(participantToExpire.getHandlers().size(), 2, "Should have 2 handlers: CURRENTSTATE/{sessionId}, and MESSAGES");
    // check zkclient#listeners
    Map<String, Set<IZkDataListener>> dataListeners = ZkTestHelper.getZkDataListener(participantToExpire.getZkClient());
    Map<String, Set<IZkChildListener>> childListeners = ZkTestHelper.getZkChildListener(participantToExpire.getZkClient());
    // printZkListeners(participantToExpire.getZkClient());
    Assert.assertEquals(dataListeners.size(), 1, "Should have 1 path (CURRENTSTATE/{sessionId}/TestDB0) which has 1 data-listeners");
    String path = keyBuilder.currentState(participantToExpire.getInstanceName(), oldSessionId, "TestDB0").getPath();
    Assert.assertEquals(dataListeners.get(path).size(), 1, "Should have 1 data-listeners on path: " + path);
    Assert.assertEquals(childListeners.size(), 2, "Should have 2 paths (CURRENTSTATE/{sessionId}, and MESSAGES) each of which has 1 child-listener");
    path = keyBuilder.currentStates(participantToExpire.getInstanceName(), oldSessionId).getPath();
    Assert.assertEquals(childListeners.get(path).size(), 1, "Should have 1 child-listener on path: " + path);
    path = keyBuilder.messages(participantToExpire.getInstanceName()).getPath();
    Assert.assertEquals(childListeners.get(path).size(), 1, "Should have 1 child-listener on path: " + path);
    path = keyBuilder.controller().getPath();
    Assert.assertNull(childListeners.get(path), "Should have no child-listener on path: " + path);
    // check zookeeper#watches on client side
    Map<String, List<String>> watchPaths = ZkTestHelper.getZkWatch(participantToExpire.getZkClient());
    LOG.debug("localhost_12918 zk-client side watchPaths: " + watchPaths);
    Assert.assertEquals(watchPaths.get("dataWatches").size(), 3, "Should have 3 data-watches: CURRENTSTATE/{sessionId}, CURRENTSTATE/{sessionId}/TestDB, MESSAGES");
    Assert.assertEquals(watchPaths.get("childWatches").size(), 2, "Should have 2 child-watches: MESSAGES, and CURRENTSTATE/{sessionId}");
    // expire localhost_12918
    System.out.println("Expire participant: " + participantToExpire.getInstanceName() + ", session: " + participantToExpire.getSessionId());
    ZkTestHelper.expireSession(participantToExpire.getZkClient());
    String newSessionId = participantToExpire.getSessionId();
    System.out.println(participantToExpire.getInstanceName() + " oldSessionId: " + oldSessionId + ", newSessionId: " + newSessionId);
    Assert.assertTrue(verifier.verify());
    // check manager#hanlders
    Assert.assertEquals(participantToExpire.getHandlers().size(), 1, "Should have 1 handler: MESSAGES. CURRENTSTATE/{sessionId} handler should be removed by CallbackHandler#handleChildChange()");
    // check zkclient#listeners
    dataListeners = ZkTestHelper.getZkDataListener(participantToExpire.getZkClient());
    childListeners = ZkTestHelper.getZkChildListener(participantToExpire.getZkClient());
    // printZkListeners(participantToExpire.getZkClient());
    Assert.assertTrue(dataListeners.isEmpty(), "Should have no data-listeners");
    Assert.assertEquals(childListeners.size(), 2, "Should have 2 paths (CURRENTSTATE/{oldSessionId}, and MESSAGES). " + "MESSAGE has 1 child-listener each. CURRENTSTATE/{oldSessionId} doesn't have listener (ZkClient doesn't remove empty childListener set. probably a ZkClient bug. see ZkClient#unsubscribeChildChange())");
    path = keyBuilder.currentStates(participantToExpire.getInstanceName(), oldSessionId).getPath();
    Assert.assertEquals(childListeners.get(path).size(), 0, "Should have no child-listener on path: " + path);
    path = keyBuilder.messages(participantToExpire.getInstanceName()).getPath();
    Assert.assertEquals(childListeners.get(path).size(), 1, "Should have 1 child-listener on path: " + path);
    path = keyBuilder.controller().getPath();
    Assert.assertNull(childListeners.get(path), "Should have no child-listener on path: " + path);
    // check zookeeper#watches on client side
    watchPaths = ZkTestHelper.getZkWatch(participantToExpire.getZkClient());
    LOG.debug("localhost_12918 zk-client side watchPaths: " + watchPaths);
    Assert.assertEquals(watchPaths.get("dataWatches").size(), 1, "Should have 1 data-watch: MESSAGES");
    Assert.assertEquals(watchPaths.get("childWatches").size(), 1, "Should have 1 child-watch: MESSAGES");
    Assert.assertEquals(watchPaths.get("existWatches").size(), 2, "Should have 2 exist-watches: CURRENTSTATE/{oldSessionId} and CURRENTSTATE/{oldSessionId}/TestDB0");
    // another session expiry on localhost_12918 should clear the two exist-watches on
    // CURRENTSTATE/{oldSessionId}
    System.out.println("Expire participant: " + participantToExpire.getInstanceName() + ", session: " + participantToExpire.getSessionId());
    ZkTestHelper.expireSession(participantToExpire.getZkClient());
    Assert.assertTrue(verifier.verify());
    // check zookeeper#watches on client side
    watchPaths = ZkTestHelper.getZkWatch(participantToExpire.getZkClient());
    LOG.debug("localhost_12918 zk-client side watchPaths: " + watchPaths);
    Assert.assertEquals(watchPaths.get("dataWatches").size(), 1, "Should have 1 data-watch: MESSAGES");
    Assert.assertEquals(watchPaths.get("childWatches").size(), 1, "Should have 1 child-watch: MESSAGES");
    Assert.assertEquals(watchPaths.get("existWatches").size(), 0, "Should have no exist-watches. exist-watches on CURRENTSTATE/{oldSessionId} and CURRENTSTATE/{oldSessionId}/TestDB0 should be cleared during handleNewSession");
    // Thread.sleep(1000);
    System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}