Example usage for org.apache.zookeeper Watcher process

Introduction

In this page you can find the example usage for org.apache.zookeeper Watcher process.

Prototype

void process(WatchedEvent event);

Source Link

Usage

From source file:co.cask.cdap.common.zookeeper.coordination.ResourceCoordinator.java

License:Apache License

/**
 * Wraps a given Watcher so that it only get triggered if {@link #shouldProcess()} returns true.
 *//* w ww  .  ja  va2  s .  co m*/
private Watcher wrapWatcher(final Watcher watcher) {
    return new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            if (!shouldProcess()) {
                return;
            }
            watcher.process(event);
        }
    };
}

From source file:co.cask.cdap.common.zookeeper.coordination.ResourceCoordinatorClient.java

License:Apache License

/**
 * Wraps a ZK watcher so that it only get triggered if this service is running.
 *
 * @param watcher The Watcher to wrap./*from  w  w  w .  j  av a 2  s  . c  om*/
 * @return A wrapped Watcher.
 */
private Watcher wrapWatcher(final Watcher watcher) {
    return new Watcher() {
        @Override
        public void process(WatchedEvent event) {
            if (isRunning()) {
                watcher.process(event);
            }
        }
    };
}

From source file:co.cask.tephra.zookeeper.TephraZKClientService.java

License:Apache License

/**
 * Wraps the given watcher to be called from the event executor.
 * @param watcher Watcher to be wrapped//from  w w w.  j  a  v  a2 s . c  o m
 * @return The wrapped Watcher
 */
private Watcher wrapWatcher(final Watcher watcher) {
    if (watcher == null) {
        return null;
    }
    return new Watcher() {
        @Override
        public void process(final WatchedEvent event) {
            if (eventExecutor.isShutdown()) {
                LOG.debug("Already shutdown. Discarding event: {}", event);
                return;
            }
            eventExecutor.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        watcher.process(event);
                    } catch (Throwable t) {
                        LOG.error("Watcher throws exception.", t);
                    }
                }
            });
        }
    };
}

From source file:co.cask.tephra.zookeeper.TephraZKClientService.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    State state = state();/*from  ww w  .j a v  a  2 s. c  o m*/
    if (state == State.TERMINATED || state == State.FAILED) {
        return;
    }

    try {
        if (event.getState() == Event.KeeperState.SyncConnected && state == State.STARTING) {
            LOG.debug("Connected to ZooKeeper: {}", zkStr);
            notifyStarted();
            return;
        }
        if (event.getState() == Event.KeeperState.Expired) {
            LOG.info("ZooKeeper session expired: {}", zkStr);

            // When connection expired, simply reconnect again
            if (state != State.RUNNING) {
                return;
            }
            eventExecutor.submit(new Runnable() {
                @Override
                public void run() {
                    // Only reconnect if the current state is running
                    if (state() != State.RUNNING) {
                        return;
                    }
                    try {
                        LOG.info("Reconnect to ZooKeeper due to expiration: {}", zkStr);
                        closeZooKeeper(zooKeeper.getAndSet(createZooKeeper()));
                    } catch (IOException e) {
                        notifyFailed(e);
                    }
                }
            });
        }
    } finally {
        if (event.getType() == Event.EventType.None) {
            for (Watcher connectionWatcher : connectionWatchers) {
                connectionWatcher.process(event);
            }
        }
    }
}

From source file:com.continuuity.loom.common.zookeeper.LeaderElection.java

License:Apache License

private Watcher wrapWatcher(final Watcher watcher) {
    return new Watcher() {
        @Override//from ww  w  . jav a2 s . c  o m
        public void process(final WatchedEvent event) {
            executor.execute(new Runnable() {
                @Override
                public void run() {
                    watcher.process(event);
                }
            });
        }
    };
}

From source file:com.continuuity.weave.internal.zookeeper.DefaultZKClientService.java

License:Open Source License

/**
 * Wraps the given watcher to be called from the event executor.
 * @param watcher Watcher to be wrapped//from   ww  w. j  a v a 2s  .  c om
 * @return The wrapped Watcher
 */
private Watcher wrapWatcher(final Watcher watcher) {
    if (watcher == null) {
        return null;
    }
    return new Watcher() {
        @Override
        public void process(final WatchedEvent event) {
            eventExecutor.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        watcher.process(event);
                    } catch (Throwable t) {
                        LOG.error("Watcher throws exception.", t);
                    }
                }
            });
        }
    };
}

From source file:com.facebook.zookeeper.mock.MockZkConnectionManager.java

License:Apache License

public void refreshClient() {
    try {/*from   ww w  . j  a v a2  s .  c o  m*/
        if (zk != null) {
            zk.close();
        }
        zk = zooKeeperFactory.create(new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                for (Watcher watcher : watchers) {
                    watcher.process(event);
                }
            }
        });
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

From source file:com.facebook.zookeeper.mock.MockZooKeeperDataStore.java

License:Apache License

public synchronized String create(long sessionId, String path, byte[] data, List<ACL> acl,
        CreateMode createMode) throws KeeperException {
    if (isRootPath(path)) {
        throw new KeeperException.NodeExistsException(path);
    }/*from w  ww . jav  a2 s . co  m*/
    String relativePath = stripRootFromPath(path);
    String relativeChildPath = root.createDescendant(sessionId, relativePath, data, acl, createMode);
    String absChildPath = addRootToPath(relativeChildPath);

    // Trigger any creation watches that may exist
    if (creationWatchers.containsKey(absChildPath)) {
        WatchedEvent watchedEvent = new WatchedEvent(EventType.NodeCreated, KeeperState.SyncConnected,
                absChildPath);
        for (Watcher watcher : creationWatchers.get(absChildPath)) {
            watcher.process(watchedEvent);
        }
        creationWatchers.remove(absChildPath);
    }
    return absChildPath;
}

From source file:com.netflix.curator.ConnectionState.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (LOG_EVENTS) {
        log.debug("ConnectState watcher: " + event);
    }//from w  w  w  .  j a  va2s.co m

    for (Watcher parentWatcher : parentWatchers) {
        TimeTrace timeTrace = new TimeTrace("connection-state-parent-process", tracer.get());
        parentWatcher.process(event);
        timeTrace.commit();
    }

    boolean wasConnected = isConnected.get();
    boolean newIsConnected = wasConnected;
    if (event.getType() == Watcher.Event.EventType.None) {
        newIsConnected = checkState(event.getState(), wasConnected);
    }

    if (newIsConnected != wasConnected) {
        isConnected.set(newIsConnected);
        connectionStartMs = System.currentTimeMillis();
    }
}

From source file:com.netflix.curator.x.zkclientbridge.CuratorZKClientBridge.java

License:Apache License

@Override
public void connect(final Watcher watcher) {
    if (watcher != null) {
        CuratorListener localListener = new CuratorListener() {
            @Override// w w  w .  j  a v a 2  s  .co  m
            public void eventReceived(CuratorFramework client, CuratorEvent event) throws Exception {
                if (event.getWatchedEvent() != null) {
                    watcher.process(event.getWatchedEvent());
                }
            }
        };
        curator.getCuratorListenable().addListener(localListener);
        listener.set(localListener);

        try {
            BackgroundCallback callback = new BackgroundCallback() {
                @Override
                public void processResult(CuratorFramework client, CuratorEvent event) throws Exception {
                    WatchedEvent fakeEvent = new WatchedEvent(Watcher.Event.EventType.None,
                            curator.getZookeeperClient().isConnected() ? Watcher.Event.KeeperState.SyncConnected
                                    : Watcher.Event.KeeperState.Disconnected,
                            null);
                    watcher.process(fakeEvent);
                }
            };
            curator.checkExists().inBackground(callback).forPath("/foo");
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}