Example usage for org.apache.zookeeper Watcher Watcher

Introduction

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

Prototype

Watcher

Source Link

Usage

From source file:blazingcache.zookeeper.ZKCacheServerLocator.java

License:Apache License

@Override
protected ServerHostData getServer() {

    String leaderPath = basePath + "/leader";
    try {/* www.j a v a  2  s . c  om*/
        byte[] data;
        if (ownedZk) {
            CountDownLatch connection = new CountDownLatch(1);
            try {
                LOGGER.finest("creating temp ZK client for discovery");
                ZooKeeper client = new ZooKeeper(zkAddress, zkSessiontimeout, new Watcher() {

                    @Override
                    public void process(WatchedEvent event) {
                        if (event.getState() == Event.KeeperState.SyncConnected
                                || event.getState() == Event.KeeperState.ConnectedReadOnly) {
                            connection.countDown();
                        }
                        LOGGER.severe("process ZK event " + event.getState() + " " + event.getType() + " "
                                + event.getPath());
                    }
                });
                try {
                    connection.await(connectTimeout, TimeUnit.MILLISECONDS);
                    LOGGER.finest("ZK client is " + client);
                    // se la connessione non sar stabilita in tempo o c' qualche problem troveremo un ConnectionLoss ad esempio                                        
                    data = client.getData(leaderPath, false, null);
                } finally {
                    client.close();
                }
            } catch (IOException err) {
                LOGGER.log(Level.SEVERE, "zookeeper client not available: " + err);
                return null;
            }

        } else {
            ZooKeeper client = zkSupplier.get();
            if (client == null) {
                LOGGER.log(Level.SEVERE, "zookeeper client available");
                return null;
            }
            data = client.getData(leaderPath, false, null);
        }
        lastKnownServer = ServerHostData.parseHostdata(data);
        return lastKnownServer;
    } catch (KeeperException.NoNodeException nobroker) {
        LOGGER.log(Level.SEVERE, "zookeeper client error", nobroker);
        return null;
    } catch (KeeperException | InterruptedException err) {
        LOGGER.log(Level.SEVERE, "zookeeper client error", err);
        return null;
    }
}

---

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.
 *///from   w w w .ja v a  2 s  .c  o  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 ww  w . j ava 2s.c o  m*/
 * @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.cdap.common.zookeeper.store.ZKPropertyStore.java

License:Apache License

private void getDataAndWatch(final String name) {
    Futures.addCallback(zkClient.getData(getPath(name), new Watcher() {
        @Override//  w w w  . j av  a  2s  . c om
        public void process(WatchedEvent event) {
            if (isClosed()) {
                return;
            }

            if (event.getType() == Event.EventType.NodeDeleted) {
                existsAndWatch(name);
            } else {
                getDataAndWatch(name);
            }
        }
    }), new FutureCallback<NodeData>() {
        @Override
        public void onSuccess(NodeData result) {
            byte[] data = result.getData();
            if (data == null) {
                updateAndNotify(name, null);
            } else {
                try {
                    updateAndNotify(name, codec.decode(data));
                } catch (IOException e) {
                    LOG.error("Failed to decode property data for {}: {}", name, Bytes.toStringBinary(data), e);
                    notifyError(name, e);
                }
            }
        }

        @Override
        public void onFailure(Throwable t) {
            if (t instanceof KeeperException.NoNodeException) {
                // If node not exists, watch for exists.
                existsAndWatch(name);
            } else {
                LOG.error("Failed to get property data for {}", name, t);
                notifyError(name, t);
            }
        }
    }, Threads.SAME_THREAD_EXECUTOR);
}

---

From source file:co.cask.cdap.common.zookeeper.store.ZKPropertyStore.java

License:Apache License

private void existsAndWatch(final String name) {
    Futures.addCallback(zkClient.exists(getPath(name), new Watcher() {
        @Override/*from   w  w w  . j a v a  2s  . c om*/
        public void process(WatchedEvent event) {
            if (isClosed()) {
                return;
            }

            // If the event is not node created, meaning the node was existed.
            // Hence getDataAndWatch should be handling that case already
            if (event.getType() == Event.EventType.NodeCreated) {
                getDataAndWatch(name);
            }
        }
    }), new FutureCallback<Stat>() {
        @Override
        public void onSuccess(Stat result) {
            // If the node exists, call getData. Otherwise, the watcher should handle the case when the node is created
            if (result != null) {
                getDataAndWatch(name);
            }
        }

        @Override
        public void onFailure(Throwable t) {
            LOG.error("Failed to check exists for property data for {}", name, t);
            notifyError(name, t);
        }
    }, Threads.SAME_THREAD_EXECUTOR);
}

---

From source file:co.cask.cdap.route.store.ZKRouteStore.java

License:Apache License

private void existsAndWatch(final ProgramId serviceId, final SettableFuture<RouteConfig> oldSettableFuture) {
    Futures.addCallback(zkClient.exists(getZKPath(serviceId), new Watcher() {
        @Override//from  w  ww  . j  a  v  a  2 s .c o m
        public void process(WatchedEvent event) {
            // If service name doesn't exist in the map, then don't rewatch it.
            if (!routeConfigMap.containsKey(serviceId)) {
                return;
            }

            if (event.getType() == Event.EventType.NodeCreated) {
                getAndWatchData(serviceId, SettableFuture.<RouteConfig>create(), oldSettableFuture,
                        new ZKRouteWatcher(serviceId));
            }
        }
    }), new FutureCallback<Stat>() {
        @Override
        public void onSuccess(@Nullable Stat result) {
            if (result != null) {
                getAndWatchData(serviceId, SettableFuture.<RouteConfig>create(), oldSettableFuture,
                        new ZKRouteWatcher(serviceId));
            }
        }

        @Override
        public void onFailure(Throwable t) {
            routeConfigMap.remove(serviceId);
            LOG.debug("Failed to check exists for property data for {}", serviceId, t);
        }
    });
}

---

From source file:co.cask.tephra.distributed.ThriftTransactionServerTest.java

License:Apache License

private void expireZkSession(ZKClientService zkClientService) throws Exception {
    ZooKeeper zooKeeper = zkClientService.getZooKeeperSupplier().get();
    final SettableFuture<?> connectFuture = SettableFuture.create();
    Watcher watcher = new Watcher() {
        @Override/* w w  w  .ja  v a2  s  .  co  m*/
        public void process(WatchedEvent event) {
            if (event.getState() == Event.KeeperState.SyncConnected) {
                connectFuture.set(null);
            }
        }
    };

    // Create another Zookeeper session with the same sessionId so that the original one expires.
    final ZooKeeper dupZookeeper = new ZooKeeper(zkClientService.getConnectString(),
            zooKeeper.getSessionTimeout(), watcher, zooKeeper.getSessionId(), zooKeeper.getSessionPasswd());
    connectFuture.get(30, TimeUnit.SECONDS);
    Assert.assertEquals("Failed to re-create current session", dupZookeeper.getState(),
            ZooKeeper.States.CONNECTED);
    dupZookeeper.close();
}

---

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.ja  va 2s. 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:com.alibaba.otter.shared.arbitrate.zookeeper.ZooKeeperClientTest.java

License:Apache License

@Test
public void testClient() {
    ZkClientx zk = ZooKeeperClient.getInstance();
    // ?zk??/*from   ww w .  ja v  a 2  s . com*/
    final ZooKeeper zkp = ((ZooKeeperx) zk.getConnection()).getZookeeper();
    ClientCnxn cnxn = (ClientCnxn) ReflectionUtils.getField(clientCnxnField, zkp);
    HostProvider hostProvider = (HostProvider) ReflectionUtils.getField(hostProviderField, cnxn);
    List<InetSocketAddress> serverAddrs = (List<InetSocketAddress>) ReflectionUtils
            .getField(serverAddressesField, hostProvider);
    want.number(serverAddrs.size()).isEqualTo(3);
    String s1 = serverAddrs.get(0).getAddress().getHostAddress() + ":" + serverAddrs.get(0).getPort();
    want.string(s1).isEqualTo(cluster1);

    Stat stat = new Stat();
    try {
        zkp.getChildren("/otter/channel/304/388", false, stat);
        System.out.println(stat.getCversion());
    } catch (KeeperException e2) {
        // TODO Auto-generated catch block
        e2.printStackTrace();
    } catch (InterruptedException e2) {
        // TODO Auto-generated catch block
        e2.printStackTrace();
    }

    // session timeout
    final CountDownLatch latch = new CountDownLatch(1);
    new Thread() {

        public void run() {
            try {
                zkp.getChildren("/", false);
            } catch (KeeperException e1) {
                want.fail();
            } catch (InterruptedException e1) {
                want.fail();
            }
            int sessionTimeout = zkp.getSessionTimeout();
            long sessionId = zkp.getSessionId();
            byte[] passwd = zkp.getSessionPasswd();
            try {
                ZooKeeper newZk = new ZooKeeper(cluster1, sessionTimeout, new Watcher() {

                    public void process(WatchedEvent event) {
                        // do nothing
                    }

                }, sessionId, passwd);

                // ?sessionIdclose??SESSION_EXPIRED
                newZk.close();
            } catch (IOException e) {
                want.fail();
            } catch (InterruptedException e) {
                want.fail();
            }

            latch.countDown();
        }

    }.start();

    try {
        latch.await();
    } catch (InterruptedException e) {
        want.fail();
    }

    zk.getChildren("/");
}

---

From source file:com.andyadc.menagerie.latches.ZkCountDownLatchTest.java

License:Apache License

private static ZooKeeper newZooKeeper() throws IOException {
    return new ZooKeeper("localhost:2181", timeout, new Watcher() {
        @Override//from w w w.j a  v  a  2 s . co  m
        public void process(WatchedEvent event) {
            System.out.println(event);
        }
    });
}

---

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