Example usage for org.apache.zookeeper KeeperException code

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Usage

From source file:org.apache.curator.framework.imps.TestTransactionsNew.java

License:Apache License

@Test
public void testErrors() throws Exception {
    CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
    try {//from  w w w  .j  av a 2 s . c  o m
        client.start();
        CuratorOp createOp1 = client.transactionOp().create().forPath("/bar");
        CuratorOp createOp2 = client.transactionOp().create().forPath("/z/blue");
        final BlockingQueue<CuratorEvent> callbackQueue = new LinkedBlockingQueue<>();
        BackgroundCallback callback = new BackgroundCallback() {
            @Override
            public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                callbackQueue.add(event);
            }
        };
        client.transaction().inBackground(callback).forOperations(createOp1, createOp2);
        CuratorEvent event = callbackQueue.poll(new Timing().milliseconds(), TimeUnit.MILLISECONDS);
        Assert.assertNotNull(event);
        Assert.assertNotNull(event.getOpResults());
        Assert.assertEquals(event.getOpResults().size(), 2);
        Assert.assertEquals(event.getOpResults().get(0).getError(), KeeperException.Code.OK.intValue());
        Assert.assertEquals(event.getOpResults().get(1).getError(), KeeperException.Code.NONODE.intValue());
    } finally {
        CloseableUtils.closeQuietly(client);
    }
}

From source file:org.apache.curator.framework.recipes.cache.PathChildrenCache.java

License:Apache License

void refresh(final RefreshMode mode) throws Exception {
    ensurePath();/*from  www  .ja v a 2 s .  co m*/

    final BackgroundCallback callback = new BackgroundCallback() {
        @Override
        public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
            if (PathChildrenCache.this.state.get().equals(State.CLOSED)) {
                // This ship is closed, don't handle the callback
                return;
            }
            if (event.getResultCode() == KeeperException.Code.OK.intValue()) {
                processChildren(event.getChildren(), mode);
            }
        }
    };

    client.getChildren().usingWatcher(childrenWatcher).inBackground(callback).forPath(path);
}

From source file:org.apache.curator.framework.recipes.cache.PathChildrenCache.java

License:Apache License

private void applyNewData(String fullPath, int resultCode, Stat stat, byte[] bytes) {
    if (resultCode == KeeperException.Code.OK.intValue()) // otherwise - node must have dropped or something - we should be getting another event
    {//from   w ww .j  a v  a  2  s  . c o m
        ChildData data = new ChildData(fullPath, stat, bytes);
        ChildData previousData = currentData.put(fullPath, data);
        if (previousData == null) // i.e. new
        {
            offerOperation(new EventOperation(this,
                    new PathChildrenCacheEvent(PathChildrenCacheEvent.Type.CHILD_ADDED, data)));
        } else if (stat.getMzxid() != previousData.getStat().getMzxid()) {
            offerOperation(new EventOperation(this,
                    new PathChildrenCacheEvent(PathChildrenCacheEvent.Type.CHILD_UPDATED, data)));
        }
        updateInitialSet(ZKPaths.getNodeFromPath(fullPath), data);
    }
}

From source file:org.apache.curator.framework.recipes.leader.LeaderLatch.java

License:Apache License

@VisibleForTesting
void reset() throws Exception {
    setLeadership(false);/*from   w w w.j av a  2 s . c  om*/
    setNode(null);

    BackgroundCallback callback = new BackgroundCallback() {
        @Override
        public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
            if (debugResetWaitLatch != null) {
                debugResetWaitLatch.await();
                debugResetWaitLatch = null;
            }

            if (event.getResultCode() == KeeperException.Code.OK.intValue()) {
                setNode(event.getName());
                if (state.get() == State.CLOSED) {
                    setNode(null);
                } else {
                    getChildren();
                }
            } else {
                log.error("getChildren() failed. rc = " + event.getResultCode());
            }
        }
    };
    client.create().creatingParentContainersIfNeeded().withProtection()
            .withMode(CreateMode.EPHEMERAL_SEQUENTIAL).inBackground(callback)
            .forPath(ZKPaths.makePath(latchPath, LOCK_NAME), LeaderSelector.getIdBytes(id));
}

From source file:org.apache.curator.framework.recipes.leader.LeaderLatch.java

License:Apache License

private void checkLeadership(List<String> children) throws Exception {
    final String localOurPath = ourPath.get();
    List<String> sortedChildren = LockInternals.getSortedChildren(LOCK_NAME, sorter, children);
    int ourIndex = (localOurPath != null) ? sortedChildren.indexOf(ZKPaths.getNodeFromPath(localOurPath)) : -1;
    if (ourIndex < 0) {
        log.error("Can't find our node. Resetting. Index: " + ourIndex);
        reset();//from   ww  w . j a  v  a 2  s.  c om
    } else if (ourIndex == 0) {
        setLeadership(true);
    } else {
        String watchPath = sortedChildren.get(ourIndex - 1);
        Watcher watcher = new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                if ((state.get() == State.STARTED) && (event.getType() == Event.EventType.NodeDeleted)
                        && (localOurPath != null)) {
                    try {
                        getChildren();
                    } catch (Exception ex) {
                        ThreadUtils.checkInterrupted(ex);
                        log.error("An error occurred checking the leadership.", ex);
                    }
                }
            }
        };

        BackgroundCallback callback = new BackgroundCallback() {
            @Override
            public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                if (event.getResultCode() == KeeperException.Code.NONODE.intValue()) {
                    // previous node is gone - reset
                    reset();
                }
            }
        };
        // use getData() instead of exists() to avoid leaving unneeded watchers which is a type of resource leak
        client.getData().usingWatcher(watcher).inBackground(callback)
                .forPath(ZKPaths.makePath(latchPath, watchPath));
    }
}

From source file:org.apache.curator.framework.recipes.leader.LeaderLatch.java

License:Apache License

private void getChildren() throws Exception {
    BackgroundCallback callback = new BackgroundCallback() {
        @Override/*from   w  w  w  . j  av  a  2 s .  c om*/
        public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
            if (event.getResultCode() == KeeperException.Code.OK.intValue()) {
                checkLeadership(event.getChildren());
            }
        }
    };
    client.getChildren().inBackground(callback).forPath(ZKPaths.makePath(latchPath, null));
}

From source file:org.apache.curator.framework.recipes.leader.TestLeaderSelectorEdges.java

License:Apache License

/**
 * Create a protected node in background with a retry policy
 *///from w ww . j  a  va  2  s. co  m
@Test
public void createProtectedNodeInBackgroundTest() throws Exception {
    final CuratorFramework client = CuratorFrameworkFactory.builder().connectString(server.getConnectString())
            .retryPolicy(new RetryNTimes(2, 1)).connectionTimeoutMs(100).sessionTimeoutMs(60000).build();
    final CountDownLatch latch = new CountDownLatch(1);
    client.start();
    try {
        client.create().forPath(ChaosMonkeyCnxnFactory.CHAOS_ZNODE);
        client.create().withProtection().withMode(CreateMode.EPHEMERAL_SEQUENTIAL)
                .inBackground(new BackgroundCallback() {
                    public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                        log.info("Receive event {}", event.toString());
                        if (event.getResultCode() == KeeperException.Code.CONNECTIONLOSS.intValue()) {
                            latch.countDown();
                        }
                    }
                }).forPath(ChaosMonkeyCnxnFactory.CHAOS_ZNODE_PREFIX + "foo-");

        Assert.assertTrue(latch.await(30, TimeUnit.SECONDS), "Callback has not been called");
        // Wait for the znode to be deleted
        Thread.sleep(ChaosMonkeyCnxnFactory.LOCKOUT_DURATION_MS * 2);
        // Check that there is no znode
        final int children = client.getChildren().forPath(ChaosMonkeyCnxnFactory.CHAOS_ZNODE).size();
        Assert.assertEquals(children, 0,
                "Still " + children + " znodes under " + ChaosMonkeyCnxnFactory.CHAOS_ZNODE + " lock");
    } finally {
        client.close();
    }

}

From source file:org.apache.curator.framework.recipes.leader.TestLeaderSelectorEdges.java

License:Apache License

/**
 * Same test as above but without a retry policy
 */// www.j  a va2s  .c  o m
@Test
public void createProtectedNodeInBackgroundTestNoRetry() throws Exception {
    final CuratorFramework client = CuratorFrameworkFactory.builder().connectString(server.getConnectString())
            .retryPolicy(new RetryNTimes(0, 0)).connectionTimeoutMs(100).sessionTimeoutMs(60000).build();
    final CountDownLatch latch = new CountDownLatch(1);
    client.start();
    try {
        client.create().forPath(ChaosMonkeyCnxnFactory.CHAOS_ZNODE);
        client.create().withProtection().withMode(CreateMode.EPHEMERAL_SEQUENTIAL)
                .inBackground(new BackgroundCallback() {
                    public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                        log.info("Receive event {}", event.toString());
                        if (event.getResultCode() == KeeperException.Code.CONNECTIONLOSS.intValue()) {
                            latch.countDown();
                        }
                    }
                }).forPath(ChaosMonkeyCnxnFactory.CHAOS_ZNODE_PREFIX + "foo-");

        Assert.assertTrue(latch.await(30, TimeUnit.SECONDS), "Callback has not been called");
        // Wait for the znode to be deleted
        Thread.sleep(ChaosMonkeyCnxnFactory.LOCKOUT_DURATION_MS * 2);
        // Check that there is no znode
        final int children = client.getChildren().forPath(ChaosMonkeyCnxnFactory.CHAOS_ZNODE).size();
        Assert.assertEquals(children, 0,
                "Still " + children + " znodes under " + ChaosMonkeyCnxnFactory.CHAOS_ZNODE + " lock");
    } finally {
        client.close();
    }

}

From source file:org.apache.curator.framework.recipes.nodes.PersistentNode.java

License:Apache License

private void processBackgroundCallbackClosedState(CuratorEvent event) {
    String path = null;/*from   ww  w .  j a va 2  s  .  co  m*/
    if (event.getResultCode() == KeeperException.Code.NODEEXISTS.intValue()) {
        path = event.getPath();
    } else if (event.getResultCode() == KeeperException.Code.OK.intValue()) {
        path = event.getName();
    }

    if (path != null) {
        try {
            client.delete().guaranteed().inBackground().forPath(path);
        } catch (Exception e) {
            log.error("Could not delete node after close", e);
        }
    }
}

From source file:org.apache.curator.framework.recipes.nodes.PersistentNode.java

License:Apache License

private void processBackgroundCallback(CuratorEvent event) throws Exception {
    String path = null;//from   w w  w. j av a  2  s .  c  o  m
    boolean nodeExists = false;
    if (event.getResultCode() == KeeperException.Code.NODEEXISTS.intValue()) {
        path = event.getPath();
        nodeExists = true;
    } else if (event.getResultCode() == KeeperException.Code.OK.intValue()) {
        path = event.getName();
    } else if (event.getResultCode() == KeeperException.Code.NOAUTH.intValue()) {
        log.warn("Client does not have authorisation to create node at path {}", event.getPath());
        authFailure.set(true);
        return;
    }
    if (path != null) {
        authFailure.set(false);
        nodePath.set(path);
        watchNode();

        if (nodeExists) {
            client.setData().inBackground(setDataCallback).forPath(getActualPath(), getData());
        } else {
            initialisationComplete();
        }
    } else {
        createNode();
    }
}