Example usage for org.apache.zookeeper WatchedEvent getPath

Introduction

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

Prototype

public String getPath() 

Source Link

Usage

From source file:org.apache.accumulo.fate.zookeeper.ZooLock.java

License:Apache License

public synchronized void lockAsync(final AsyncLockWatcher lw, byte data[]) {

    if (lockWatcher != null || lock != null || asyncLock != null) {
        throw new IllegalStateException();
    }/* ww w. j  ava2 s . c  om*/

    lockWasAcquired = false;

    try {
        final String asyncLockPath = zooKeeper.putEphemeralSequential(path + "/" + LOCK_PREFIX, data);
        log.trace("Ephemeral node " + asyncLockPath + " created");
        Stat stat = zooKeeper.getStatus(asyncLockPath, new Watcher() {

            private void failedToAcquireLock() {
                lw.failedToAcquireLock(new Exception("Lock deleted before acquired"));
                asyncLock = null;
            }

            @Override
            public void process(WatchedEvent event) {
                synchronized (ZooLock.this) {
                    if (lock != null && event.getType() == EventType.NodeDeleted
                            && event.getPath().equals(path + "/" + lock)) {
                        lostLock(LockLossReason.LOCK_DELETED);
                    } else if (asyncLock != null && event.getType() == EventType.NodeDeleted
                            && event.getPath().equals(path + "/" + asyncLock)) {
                        failedToAcquireLock();
                    } else if (event.getState() != KeeperState.Disconnected
                            && event.getState() != KeeperState.Expired && (lock != null || asyncLock != null)) {
                        log.debug("Unexpected event watching lock node " + event + " " + asyncLockPath);
                        try {
                            Stat stat2 = zooKeeper.getStatus(asyncLockPath, this);
                            if (stat2 == null) {
                                if (lock != null)
                                    lostLock(LockLossReason.LOCK_DELETED);
                                else if (asyncLock != null)
                                    failedToAcquireLock();
                            }
                        } catch (Throwable e) {
                            lockWatcher.unableToMonitorLockNode(e);
                            log.error("Failed to stat lock node " + asyncLockPath, e);
                        }
                    }

                }
            }
        });

        if (stat == null) {
            lw.failedToAcquireLock(new Exception("Lock does not exist after create"));
            return;
        }

        asyncLock = asyncLockPath.substring(path.length() + 1);

        lockAsync(asyncLock, lw);

    } catch (KeeperException e) {
        lw.failedToAcquireLock(e);
    } catch (InterruptedException e) {
        lw.failedToAcquireLock(e);
    }
}

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From source file:org.apache.accumulo.fate.zookeeper.ZooLock.java

License:Apache License

@Override
public synchronized void process(WatchedEvent event) {
    log.debug("event " + event.getPath() + " " + event.getType() + " " + event.getState());

    watchingParent = false;/*  w  w  w  .  j  a v  a 2  s . c om*/

    if (event.getState() == KeeperState.Expired && lock != null) {
        lostLock(LockLossReason.SESSION_EXPIRED);
    } else {

        try { // set the watch on the parent node again
            zooKeeper.getStatus(path, this);
            watchingParent = true;
        } catch (KeeperException.ConnectionLossException ex) {
            // we can't look at the lock because we aren't connected, but our session is still good
            log.warn("lost connection to zookeeper");
        } catch (Exception ex) {
            if (lock != null || asyncLock != null) {
                lockWatcher.unableToMonitorLockNode(ex);
                log.error("Error resetting watch on ZooLock " + lock == null ? asyncLock : lock + " " + event,
                        ex);
            }
        }

    }

}

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From source file:org.apache.accumulo.server.conf.NamespaceConfWatcher.java

License:Apache License

static String toString(WatchedEvent event) {
    return new StringBuilder("{path=").append(event.getPath()).append(",state=").append(event.getState())
            .append(",type=").append(event.getType()).append("}").toString();
}

---

From source file:org.apache.accumulo.server.conf.NamespaceConfWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    String path = event.getPath();
    if (log.isTraceEnabled())
        log.trace("WatchedEvent : " + toString(event));

    String namespaceId = null;// w ww.  j  a v  a  2  s . c  o  m
    String key = null;

    if (path != null) {
        if (path.startsWith(namespacesPrefix)) {
            namespaceId = path.substring(namespacesPrefixLength);
            if (namespaceId.contains("/")) {
                namespaceId = namespaceId.substring(0, namespaceId.indexOf('/'));
                if (path.startsWith(namespacesPrefix + namespaceId + Constants.ZNAMESPACE_CONF + "/"))
                    key = path.substring(
                            (namespacesPrefix + namespaceId + Constants.ZNAMESPACE_CONF + "/").length());
            }
        }

        if (namespaceId == null) {
            log.warn("Zookeeper told me about a path I was not watching: " + path + ", event "
                    + toString(event));
            return;
        }
    }

    switch (event.getType()) {
    case NodeDataChanged:
        if (log.isTraceEnabled())
            log.trace("EventNodeDataChanged " + event.getPath());
        if (key != null)
            scf.getNamespaceConfiguration(namespaceId).propertyChanged(key);
        break;
    case NodeChildrenChanged:
        scf.getNamespaceConfiguration(namespaceId).propertiesChanged();
        break;
    case NodeDeleted:
        if (key == null) {
            ServerConfigurationFactory.removeCachedNamespaceConfiguration(instance.getInstanceID(),
                    namespaceId);
        }
        break;
    case None:
        switch (event.getState()) {
        case Expired:
            ServerConfigurationFactory.expireAllTableObservers();
            break;
        case SyncConnected:
            break;
        case Disconnected:
            break;
        default:
            log.warn("EventNone event not handled " + toString(event));
        }
        break;
    case NodeCreated:
        switch (event.getState()) {
        case SyncConnected:
            break;
        default:
            log.warn("Event NodeCreated event not handled " + toString(event));
        }
        break;
    default:
        log.warn("Event not handled " + toString(event));
    }
}

---

From source file:org.apache.accumulo.server.conf.TableConfWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    String path = event.getPath();
    if (log.isTraceEnabled())
        log.trace("WatchedEvent : " + toString(event));

    String tableId = null;/* ww  w.j a va  2s  . c om*/
    String key = null;

    if (path != null) {
        if (path.startsWith(tablesPrefix)) {
            tableId = path.substring(tablesPrefix.length());
            if (tableId.contains("/")) {
                tableId = tableId.substring(0, tableId.indexOf('/'));
                if (path.startsWith(tablesPrefix + tableId + Constants.ZTABLE_CONF + "/"))
                    key = path.substring((tablesPrefix + tableId + Constants.ZTABLE_CONF + "/").length());
            }
        }

        if (tableId == null) {
            log.warn("Zookeeper told me about a path I was not watching: " + path + ", event "
                    + toString(event));
            return;
        }
    }

    switch (event.getType()) {
    case NodeDataChanged:
        if (log.isTraceEnabled())
            log.trace("EventNodeDataChanged " + event.getPath());
        if (key != null)
            scf.getTableConfiguration(tableId).propertyChanged(key);
        break;
    case NodeChildrenChanged:
        scf.getTableConfiguration(tableId).propertiesChanged();
        break;
    case NodeDeleted:
        if (key == null) {
            // only remove the AccumuloConfiguration object when a
            // table node is deleted, not when a tables property is
            // deleted.
            ServerConfigurationFactory.removeCachedTableConfiguration(instance.getInstanceID(), tableId);
        }
        break;
    case None:
        switch (event.getState()) {
        case Expired:
            ServerConfigurationFactory.expireAllTableObservers();
            break;
        case SyncConnected:
            break;
        case Disconnected:
            break;
        default:
            log.warn("EventNone event not handled " + toString(event));
        }
        break;
    case NodeCreated:
        switch (event.getState()) {
        case SyncConnected:
            break;
        default:
            log.warn("Event NodeCreated event not handled " + toString(event));
        }
        break;
    default:
        log.warn("Event not handled " + toString(event));
    }
}

---

From source file:org.apache.accumulo.server.logger.LogService.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    LOG.debug("event " + event.getPath() + " " + event.getType() + " " + event.getState());

    if (event.getState() == KeeperState.Expired) {
        LOG.warn("Logger lost zookeeper registration at " + event.getPath());
        service.stop();/*from ww  w  . j  av  a2  s.c o  m*/
    } else if (event.getType() == EventType.NodeDeleted) {
        LOG.info("Logger zookeeper entry lost " + event.getPath());
        String[] path = event.getPath().split("/");
        if (path[path.length - 1].equals(Constants.ZLOGGERS)
                && this.shutdownState == ShutdownState.REGISTERED) {
            LOG.fatal("Stopping server, zookeeper entry lost " + event.getPath());
            service.stop();
        }
    }
}

---

From source file:org.apache.accumulo.server.master.LiveTServerSet.java

License:Apache License

@Override
public void process(WatchedEvent event) {

    // its important that these event are propagated by ZooCache, because this ensures when reading zoocache that is has already processed the event and cleared
    // relevant nodes before code below reads from zoocache

    if (event.getPath() != null) {
        if (event.getPath().endsWith(Constants.ZTSERVERS)) {
            scanServers();//w w  w .java2 s .  com
        } else if (event.getPath().contains(Constants.ZTSERVERS)) {
            int pos = event.getPath().lastIndexOf('/');

            // do only if ZTSERVER is parent
            if (pos >= 0 && event.getPath().substring(0, pos).endsWith(Constants.ZTSERVERS)) {

                String server = event.getPath().substring(pos + 1);

                final Set<TServerInstance> updates = new HashSet<>();
                final Set<TServerInstance> doomed = new HashSet<>();

                final String path = ZooUtil.getRoot(context.getInstance()) + Constants.ZTSERVERS;

                try {
                    checkServer(updates, doomed, path, server);
                    if (!doomed.isEmpty() || !updates.isEmpty())
                        this.cback.update(this, doomed, updates);
                } catch (Exception ex) {
                    log.error("Exception", ex);
                }
            }
        }
    }
}

---

From source file:org.apache.accumulo.server.security.delegation.ZooAuthenticationKeyWatcher.java

License:Apache License

@Override
public void process(WatchedEvent event) {
    if (EventType.None == event.getType()) {
        switch (event.getState()) {
        case Disconnected: // Intentional fall through of case
        case Expired: // ZooReader is handling the Expiration of the original ZooKeeper object for us
            log.debug("ZooKeeper connection disconnected, clearing secret manager");
            secretManager.removeAllKeys();
            break;
        case SyncConnected:
            log.debug("ZooKeeper reconnected, updating secret manager");
            try {
                updateAuthKeys();/*from  w w  w  .ja  v a 2  s.  c  om*/
            } catch (KeeperException | InterruptedException e) {
                log.error("Failed to update secret manager after ZooKeeper reconnect");
            }
            break;
        default:
            log.warn("Unhandled: " + event);
        }

        // Nothing more to do for EventType.None
        return;
    }

    String path = event.getPath();
    if (null == path) {
        return;
    }

    if (!path.startsWith(baseNode)) {
        log.info("Ignoring event for path: {}", path);
        return;
    }

    try {
        if (path.equals(baseNode)) {
            processBaseNode(event);
        } else {
            processChildNode(event);
        }
    } catch (KeeperException | InterruptedException e) {
        log.error("Failed to communicate with ZooKeeper", e);
    }
}

---

From source file:org.apache.accumulo.server.security.delegation.ZooAuthenticationKeyWatcher.java

License:Apache License

/**
 * Process the {@link WatchedEvent} for the base znode that the {@link AuthenticationKey}s are stored in.
 *///ww  w  . ja va  2 s . com
void processBaseNode(WatchedEvent event) throws KeeperException, InterruptedException {
    switch (event.getType()) {
    case NodeDeleted:
        // The parent node was deleted, no children are possible, remove all keys
        log.debug("Parent ZNode was deleted, removing all AuthenticationKeys");
        secretManager.removeAllKeys();
        break;
    case None:
        // Not connected, don't care
        break;
    case NodeCreated: // intentional fall-through to NodeChildrenChanged
    case NodeChildrenChanged:
        // Process each child, and reset the watcher on the parent node. We know that the node exists
        updateAuthKeys(event.getPath());
        break;
    case NodeDataChanged:
        // The data on the parent changed. We aren't storing anything there so it's a noop
        break;
    default:
        log.warn("Unsupported event type: {}", event.getType());
        break;
    }
}

---

From source file:org.apache.accumulo.server.security.delegation.ZooAuthenticationKeyWatcher.java

License:Apache License

/**
 * Process the {@link WatchedEvent} for a node which represents an {@link AuthenticationKey}
 *///from ww  w.ja  v a2s. com
void processChildNode(WatchedEvent event) throws KeeperException, InterruptedException {
    final String path = event.getPath();
    switch (event.getType()) {
    case NodeDeleted:
        // Key expired
        if (null == path) {
            log.error("Got null path for NodeDeleted event");
            return;
        }

        // Pull off the base ZK path and the '/' separator
        String childName = path.substring(baseNode.length() + 1);
        secretManager.removeKey(Integer.parseInt(childName));
        break;
    case None:
        // Not connected, don't care. We'll update when we're reconnected
        break;
    case NodeCreated:
        // New key created
        if (null == path) {
            log.error("Got null path for NodeCreated event");
            return;
        }
        // Get the data and reset the watcher
        AuthenticationKey key = deserializeKey(zk.getData(path, this, null));
        log.debug("Adding AuthenticationKey with keyId {}", key.getKeyId());
        secretManager.addKey(key);
        break;
    case NodeDataChanged:
        // Key changed, could happen on restart after not running Accumulo.
        if (null == path) {
            log.error("Got null path for NodeDataChanged event");
            return;
        }
        // Get the data and reset the watcher
        AuthenticationKey newKey = deserializeKey(zk.getData(path, this, null));
        // Will overwrite the old key if one exists
        secretManager.addKey(newKey);
        break;
    case NodeChildrenChanged:
        // no children for the children..
        log.warn("Unexpected NodeChildrenChanged event for authentication key node {}", path);
        break;
    default:
        log.warn("Unsupported event type: {}", event.getType());
        break;
    }
}

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