Example usage for org.apache.zookeeper KeeperException code

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

License:Apache License

/**
 * Gets the children of the given node. A watch is established by this call.
 *
 * @param zPath/*w ww  .ja v a 2 s  . c  om*/
 *          path of node
 * @return children list, or null if node has no children or does not exist
 */
public synchronized List<String> getChildren(final String zPath) {

    ZooRunnable<List<String>> zr = new ZooRunnable<List<String>>() {

        @Override
        public List<String> run() throws KeeperException, InterruptedException {
            try {
                cacheReadLock.lock();
                if (childrenCache.containsKey(zPath)) {
                    return childrenCache.get(zPath);
                }
            } finally {
                cacheReadLock.unlock();
            }

            cacheWriteLock.lock();
            try {
                if (childrenCache.containsKey(zPath)) {
                    return childrenCache.get(zPath);
                }

                final ZooKeeper zooKeeper = getZooKeeper();

                List<String> children = zooKeeper.getChildren(zPath, watcher);
                childrenCache.put(zPath, children);
                return children;
            } catch (KeeperException ke) {
                if (ke.code() != Code.NONODE) {
                    throw ke;
                }
            } finally {
                cacheWriteLock.unlock();
            }
            return null;
        }

    };

    List<String> children = zr.retry();

    if (children == null) {
        return null;
    }
    return Collections.unmodifiableList(children);
}

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

License:Apache License

@Override
public byte[] getData(String zPath, boolean watch, Stat stat) throws KeeperException, InterruptedException {
    final Retry retry = getRetryFactory().create();
    while (true) {
        try {/*from ww w  .jav  a 2  s. c  o m*/
            return getZooKeeper().getData(zPath, watch, stat);
        } catch (KeeperException e) {
            final Code code = e.code();
            if (code == Code.CONNECTIONLOSS || code == Code.OPERATIONTIMEOUT || code == Code.SESSIONEXPIRED) {
                retryOrThrow(retry, e);
            } else {
                throw e;
            }
        }

        retry.waitForNextAttempt();
    }
}

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

License:Apache License

@Override
public byte[] getData(String zPath, Watcher watcher, Stat stat) throws KeeperException, InterruptedException {
    final Retry retry = getRetryFactory().create();
    while (true) {
        try {//from   ww w.  j av a 2  s  .c o m
            return getZooKeeper().getData(zPath, watcher, stat);
        } catch (KeeperException e) {
            final Code code = e.code();
            if (code == Code.CONNECTIONLOSS || code == Code.OPERATIONTIMEOUT || code == Code.SESSIONEXPIRED) {
                retryOrThrow(retry, e);
            } else {
                throw e;
            }
        }

        retry.waitForNextAttempt();
    }
}

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

License:Apache License

@Override
public Stat getStatus(String zPath) throws KeeperException, InterruptedException {
    final Retry retry = getRetryFactory().create();
    while (true) {
        try {/*from  ww  w  .  j  a v a  2  s  .co m*/
            return getZooKeeper().exists(zPath, false);
        } catch (KeeperException e) {
            final Code code = e.code();
            if (code == Code.CONNECTIONLOSS || code == Code.OPERATIONTIMEOUT || code == Code.SESSIONEXPIRED) {
                retryOrThrow(retry, e);
            } else {
                throw e;
            }
        }

        retry.waitForNextAttempt();
    }
}

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

License:Apache License

@Override
public Stat getStatus(String zPath, Watcher watcher) throws KeeperException, InterruptedException {
    final Retry retry = getRetryFactory().create();
    while (true) {
        try {//from   ww  w  .j  ava2  s.  c  o  m
            return getZooKeeper().exists(zPath, watcher);
        } catch (KeeperException e) {
            final Code code = e.code();
            if (code == Code.CONNECTIONLOSS || code == Code.OPERATIONTIMEOUT || code == Code.SESSIONEXPIRED) {
                retryOrThrow(retry, e);
            } else {
                throw e;
            }
        }

        retry.waitForNextAttempt();
    }
}

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

License:Apache License

@Override
public List<String> getChildren(String zPath) throws KeeperException, InterruptedException {
    final Retry retry = getRetryFactory().create();
    while (true) {
        try {//  w  w w  .java 2  s  .  c om
            return getZooKeeper().getChildren(zPath, false);
        } catch (KeeperException e) {
            final Code code = e.code();
            if (code == Code.CONNECTIONLOSS || code == Code.OPERATIONTIMEOUT || code == Code.SESSIONEXPIRED) {
                retryOrThrow(retry, e);
            } else {
                throw e;
            }
        }

        retry.waitForNextAttempt();
    }
}

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

License:Apache License

@Override
public List<String> getChildren(String zPath, Watcher watcher) throws KeeperException, InterruptedException {
    final Retry retry = getRetryFactory().create();
    while (true) {
        try {// w w  w  .  j av  a  2  s .c o  m
            return getZooKeeper().getChildren(zPath, watcher);
        } catch (KeeperException e) {
            final Code code = e.code();
            if (code == Code.CONNECTIONLOSS || code == Code.OPERATIONTIMEOUT || code == Code.SESSIONEXPIRED) {
                retryOrThrow(retry, e);
            } else {
                throw e;
            }
        }

        retry.waitForNextAttempt();
    }
}

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

License:Apache License

@Override
public boolean exists(String zPath) throws KeeperException, InterruptedException {
    final Retry retry = getRetryFactory().create();
    while (true) {
        try {//  ww w . ja  v  a2s . c o m
            return getZooKeeper().exists(zPath, false) != null;
        } catch (KeeperException e) {
            final Code code = e.code();
            if (code == Code.CONNECTIONLOSS || code == Code.OPERATIONTIMEOUT || code == Code.SESSIONEXPIRED) {
                retryOrThrow(retry, e);
            } else {
                throw e;
            }
        }

        retry.waitForNextAttempt();
    }
}

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

License:Apache License

@Override
public boolean exists(String zPath, Watcher watcher) throws KeeperException, InterruptedException {
    final Retry retry = getRetryFactory().create();
    while (true) {
        try {//ww  w.j  a v  a 2s . c o  m
            return getZooKeeper().exists(zPath, watcher) != null;
        } catch (KeeperException e) {
            final Code code = e.code();
            if (code == Code.CONNECTIONLOSS || code == Code.OPERATIONTIMEOUT || code == Code.SESSIONEXPIRED) {
                retryOrThrow(retry, e);
            } else {
                throw e;
            }
        }

        retry.waitForNextAttempt();
    }
}

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

License:Apache License

@Override
public void sync(final String path) throws KeeperException, InterruptedException {
    final AtomicInteger rc = new AtomicInteger();
    final CountDownLatch waiter = new CountDownLatch(1);
    getZooKeeper().sync(path, new VoidCallback() {
        @Override/*from  ww  w  .j a v a 2 s  .co  m*/
        public void processResult(int code, String arg1, Object arg2) {
            rc.set(code);
            waiter.countDown();
        }
    }, null);
    waiter.await();
    Code code = Code.get(rc.get());
    if (code != KeeperException.Code.OK) {
        throw KeeperException.create(code);
    }
}