Example usage for java.util.concurrent.locks Condition signal

Introduction

In this page you can find the example usage for java.util.concurrent.locks Condition signal.

Prototype

void signal();

Source Link

Document

Wakes up one waiting thread.

Usage

From source file:io.fabric8.maven.core.service.PortForwardService.java

/**
 * Forwards a port to the newest pod matching the given selector.
 * If another pod is created, it forwards connections to the new pod once it's ready.
 *//*www  . j  a v  a  2  s  . c o  m*/
public Closeable forwardPortAsync(final Logger externalProcessLogger, final LabelSelector podSelector,
        final int remotePort, final int localPort) throws Fabric8ServiceException {

    final Lock monitor = new ReentrantLock(true);
    final Condition podChanged = monitor.newCondition();
    final Pod[] nextForwardedPod = new Pod[1];

    final Thread forwarderThread = new Thread() {
        @Override
        public void run() {

            Pod currentPod = null;
            Closeable currentPortForward = null;

            try {
                monitor.lock();

                while (true) {
                    if (podEquals(currentPod, nextForwardedPod[0])) {
                        podChanged.await();
                    } else {
                        Pod nextPod = nextForwardedPod[0]; // may be null
                        try {
                            monitor.unlock();
                            // out of critical section

                            if (currentPortForward != null) {
                                log.info("Closing port-forward from pod %s",
                                        KubernetesHelper.getName(currentPod));
                                currentPortForward.close();
                                currentPortForward = null;
                            }

                            if (nextPod != null) {
                                log.info("Starting port-forward to pod %s", KubernetesHelper.getName(nextPod));
                                currentPortForward = forwardPortAsync(externalProcessLogger,
                                        KubernetesHelper.getName(nextPod), remotePort, localPort);
                            } else {
                                log.info("Waiting for a pod to become ready before starting port-forward");
                            }
                            currentPod = nextPod;
                        } finally {
                            monitor.lock();
                        }
                    }

                }

            } catch (InterruptedException e) {
                log.debug("Port-forwarding thread interrupted", e);
                Thread.currentThread().interrupt();
            } catch (Exception e) {
                log.warn("Error while port-forwarding to pod", e);
            } finally {
                monitor.unlock();

                if (currentPortForward != null) {
                    try {
                        currentPortForward.close();
                    } catch (Exception e) {
                    }
                }
            }
        }
    };

    // Switching forward to the current pod if present
    Pod newPod = getNewestPod(podSelector);
    nextForwardedPod[0] = newPod;

    final Watch watch = KubernetesClientUtil.withSelector(kubernetes.pods(), podSelector, log)
            .watch(new Watcher<Pod>() {

                @Override
                public void eventReceived(Action action, Pod pod) {
                    monitor.lock();
                    try {
                        List<Pod> candidatePods;
                        if (nextForwardedPod[0] != null) {
                            candidatePods = new LinkedList<>();
                            candidatePods.add(nextForwardedPod[0]);
                            candidatePods.add(pod);
                        } else {
                            candidatePods = Collections.singletonList(pod);
                        }
                        Pod newPod = getNewestPod(candidatePods); // may be null
                        if (!podEquals(nextForwardedPod[0], newPod)) {
                            nextForwardedPod[0] = newPod;
                            podChanged.signal();
                        }
                    } finally {
                        monitor.unlock();
                    }
                }

                @Override
                public void onClose(KubernetesClientException e) {
                    // don't care
                }
            });

    forwarderThread.start();

    final Closeable handle = new Closeable() {
        @Override
        public void close() throws IOException {
            try {
                watch.close();
            } catch (Exception e) {
            }
            try {
                forwarderThread.interrupt();
                forwarderThread.join(15000);
            } catch (Exception e) {
            }
        }
    };
    Runtime.getRuntime().addShutdownHook(new Thread() {
        @Override
        public void run() {
            try {
                handle.close();
            } catch (Exception e) {
                // suppress
            }
        }
    });

    return handle;
}

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From source file:org.commoncrawl.util.S3InputStream.java

@Override
public boolean contentAvailable(NIOHttpConnection theConnection, int itemId, String itemKey,
        NIOBufferList contentBuffer) {/*from  w  w  w  . j a v a  2  s  . c  o m*/

    ByteBuffer buffer = null;
    IOException exception = null;
    //int receivedBytes = 0;
    try {
        while ((buffer = contentBuffer.read()) != null) {
            if (buffer.position() != 0) {
                buffer = buffer.slice();
            }
            //receivedBytes += buffer.remaining();
            buffer.position(buffer.limit());
            _bufferQueue.write(buffer);
        }
        _bufferQueue.flush();
    } catch (IOException e) {
        LOG.error(CCStringUtils.stringifyException(e));
        exception = e;
    }
    if (_bufferQueue.available() >= MAX_BUFFER_SIZE) {
        LOG.info("*** PAUSING DOWNLOADS FOR:" + theConnection.getURL());
        theConnection.disableReads();
        pausedConnection.set(theConnection);
    }
    //long nanoTimeStart = System.nanoTime();
    _writeLock.lock();
    //long nanoTimeEnd = System.nanoTime();
    //System.out.println("Received: " + receivedBytes + "for URI:" + uri + " Lock took:" + (nanoTimeEnd-nanoTimeStart));
    try {
        Condition writeCondition = _writeEvent.getAndSet(null);
        if (exception != null) {
            _eofCondition.set(true);
            _exception.set(exception);
        }
        if (writeCondition != null) {
            writeCondition.signal();
        }
    } finally {
        _writeLock.unlock();
    }
    return true;
}

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From source file:org.commoncrawl.util.S3InputStream.java

@Override
public void downloadFailed(NIOHttpConnection connection, int itemId, String itemKey, String errorCode) {
    LOG.error("Download Failed for URI:" + S3InputStream.this.uri);
    _writeLock.lock();//from  w  ww  .  j  a va2s. c  om
    try {
        _exception.set(new IOException(errorCode));
        _eofCondition.set(true);
        Condition writeCondition = _writeEvent.getAndSet(null);
        if (writeCondition != null) {
            writeCondition.signal();
        }
    } finally {
        _writeLock.unlock();
    }
    downloader.getEventLoop().cancelTimer(timeoutTimer);
    activeConnection.set(null);
}

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From source file:org.commoncrawl.util.S3InputStream.java

@Override
public void downloadComplete(NIOHttpConnection connection, int itemId, String itemKey) {
    LOG.info("Download Complete for URI:" + S3InputStream.this.uri);
    _writeLock.lock();/*  w  w  w .  j  a v  a  2  s  . c  om*/
    try {
        _exception.set(null);
        _eofCondition.set(true);
        Condition writeCondition = _writeEvent.getAndSet(null);
        if (writeCondition != null) {
            writeCondition.signal();
        }
    } finally {
        _writeLock.unlock();
    }
    downloader.getEventLoop().cancelTimer(timeoutTimer);
    activeConnection.set(null);
}

---

From source file:org.commoncrawl.util.shared.S3InputStream.java

@Override
public boolean contentAvailable(NIOHttpConnection theConnection, int itemId, String itemKey,
        NIOBufferList contentBuffer) {//from   ww  w. j  ava2 s . c  om

    ByteBuffer buffer = null;
    IOException exception = null;
    //int receivedBytes = 0;
    try {
        while ((buffer = contentBuffer.read()) != null) {
            if (buffer.position() != 0) {
                buffer = buffer.slice();
            }
            //receivedBytes += buffer.remaining();
            buffer.position(buffer.limit());
            _bufferQueue.write(buffer);
        }
        _bufferQueue.flush();
    } catch (IOException e) {
        LOG.error(CCStringUtils.stringifyException(e));
        exception = e;
    }
    if (_bufferQueue.available() >= MAX_BUFFER_SIZE) {
        theConnection.disableReads();
        pausedConnection.set(theConnection);
    }
    //long nanoTimeStart = System.nanoTime();
    _writeLock.lock();
    //long nanoTimeEnd = System.nanoTime();
    //System.out.println("Received: " + receivedBytes + "for URI:" + uri + " Lock took:" + (nanoTimeEnd-nanoTimeStart));
    try {
        Condition writeCondition = _writeEvent.getAndSet(null);
        if (exception != null) {
            _eofCondition.set(true);
            _exception.set(exception);
        }
        if (writeCondition != null) {
            writeCondition.signal();
        }
    } finally {
        _writeLock.unlock();
    }
    return true;
}

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From source file:org.commoncrawl.util.shared.S3InputStream.java

@Override
public void downloadFailed(int itemId, String itemKey, String errorCode) {
    LOG.error("Download Failed for URI:" + S3InputStream.this.uri);
    _writeLock.lock();/*from www.ja  v a  2s.c  o m*/
    try {
        _exception.set(new IOException(errorCode));
        _eofCondition.set(true);
        Condition writeCondition = _writeEvent.getAndSet(null);
        if (writeCondition != null) {
            writeCondition.signal();
        }
    } finally {
        _writeLock.unlock();
    }
}

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From source file:org.commoncrawl.util.shared.S3InputStream.java

@Override
public void downloadComplete(int itemId, String itemKey) {
    LOG.info("Download Complete for URI:" + S3InputStream.this.uri);
    _writeLock.lock();//from   ww w .  j a v a 2s .c o  m
    try {
        _exception.set(null);
        _eofCondition.set(true);
        Condition writeCondition = _writeEvent.getAndSet(null);
        if (writeCondition != null) {
            writeCondition.signal();
        }
    } finally {
        _writeLock.unlock();
    }
}

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