Examples with Reference java.lang.ref.Reference used on opensource projects

Example 51 with Reference

use of java.lang.ref.Reference in project geode by apache.

the class ConnectionTable method getThreadOwnedConnection.

/**
   * Must be looking for an ordered connection that this thread owns
   * 
   * @param id stub on which to create the connection
   * @param startTime the ms clock start time for the operation
   * @param ackTimeout the ms ack-wait-threshold, or zero
   * @param ackSATimeout the ms ack-severe-alert-threshold, or zero
   * @return the connection, or null if an error
   * @throws IOException if the connection could not be created
   * @throws DistributedSystemDisconnectedException
   */
Connection getThreadOwnedConnection(DistributedMember id, long startTime, long ackTimeout, long ackSATimeout) throws IOException, DistributedSystemDisconnectedException {
    Connection result = null;
    // Look for result in the thread local
    Map m = (Map) this.threadOrderedConnMap.get();
    if (m == null) {
        // First time for this thread. Create thread local
        m = new HashMap();
        synchronized (this.threadConnMaps) {
            if (this.closed) {
                owner.getCancelCriterion().checkCancelInProgress(null);
                throw new DistributedSystemDisconnectedException(LocalizedStrings.ConnectionTable_CONNECTION_TABLE_IS_CLOSED.toLocalizedString());
            }
            // check for stale references and remove them.
            for (Iterator it = this.threadConnMaps.iterator(); it.hasNext(); ) {
                Reference r = (Reference) it.next();
                if (r.get() == null) {
                    it.remove();
                }
            }
            // for
            // ref added for bug 38011
            this.threadConnMaps.add(new WeakReference(m));
        }
        // synchronized
        this.threadOrderedConnMap.set(m);
    } else {
        // Consult thread local.
        synchronized (m) {
            result = (Connection) m.get(id);
        }
        if (result != null && result.timedOut) {
            result = null;
        }
    }
    if (result != null)
        return result;
    // OK, we have to create a new connection.
    result = Connection.createSender(owner.getMembershipManager(), this, true, /* preserveOrder */
    id, false, /* shared */
    startTime, ackTimeout, ackSATimeout);
    if (logger.isDebugEnabled()) {
        logger.debug("ConnectionTable: created an ordered connection: {}", result);
    }
    this.owner.stats.incSenders(false, /* shared */
    true);
    if (this.threadConnectionMap == null) {
        // This instance is being destroyed; fail the operation
        closeCon(LocalizedStrings.ConnectionTable_CONNECTION_TABLE_BEING_DESTROYED.toLocalizedString(), result);
        return null;
    }
    ArrayList al = (ArrayList) this.threadConnectionMap.get(id);
    if (al == null) {
        // First connection for this DistributedMember. Make sure list for this
        // stub is created if it isn't already there.
        al = new ArrayList();
        // Since it's a concurrent map, we just try to put it and then
        // return whichever we got.
        Object o = this.threadConnectionMap.putIfAbsent(id, al);
        if (o != null) {
            al = (ArrayList) o;
        }
    }
    // Add our Connection to the list
    synchronized (al) {
        al.add(result);
    }
    // Finally, add the connection to our thread local map.
    synchronized (m) {
        m.put(id, result);
    }
    scheduleIdleTimeout(result);
    return result;
}

Example 52 with Reference

use of java.lang.ref.Reference in project geode by apache.

the class ConnectionTable method close.

protected void close() {
    /*
     * NOMUX if (inputMuxManager != null) { inputMuxManager.stop(); }
     */
    if (this.closed) {
        return;
    }
    this.closed = true;
    synchronized (this) {
        if (this.idleConnTimer != null) {
            this.idleConnTimer.cancel();
        }
    }
    synchronized (this.orderedConnectionMap) {
        for (Iterator it = this.orderedConnectionMap.values().iterator(); it.hasNext(); ) {
            closeCon(LocalizedStrings.ConnectionTable_CONNECTION_TABLE_BEING_DESTROYED.toLocalizedString(), it.next());
        }
        this.orderedConnectionMap.clear();
    }
    synchronized (this.unorderedConnectionMap) {
        for (Iterator it = this.unorderedConnectionMap.values().iterator(); it.hasNext(); ) {
            closeCon(LocalizedStrings.ConnectionTable_CONNECTION_TABLE_BEING_DESTROYED.toLocalizedString(), it.next());
        }
        this.unorderedConnectionMap.clear();
    }
    if (this.threadConnectionMap != null) {
        this.threadConnectionMap = null;
    }
    if (this.threadConnMaps != null) {
        synchronized (this.threadConnMaps) {
            for (Iterator it = this.threadConnMaps.iterator(); it.hasNext(); ) {
                Reference r = (Reference) it.next();
                Map m = (Map) r.get();
                if (m != null) {
                    synchronized (m) {
                        for (Iterator mit = m.values().iterator(); mit.hasNext(); ) {
                            closeCon(LocalizedStrings.ConnectionTable_CONNECTION_TABLE_BEING_DESTROYED.toLocalizedString(), mit.next());
                        }
                    }
                }
            }
            this.threadConnMaps.clear();
        }
    }
    {
        Executor localExec = this.p2pReaderThreadPool;
        if (localExec != null) {
            if (localExec instanceof ExecutorService) {
                ((ExecutorService) localExec).shutdown();
            }
        }
    }
    closeReceivers(false);
    Map m = (Map) this.threadOrderedConnMap.get();
    if (m != null) {
        synchronized (m) {
            m.clear();
        }
    }
    this.socketCloser.close();
}

Example 53 with Reference

use of java.lang.ref.Reference in project jdk8u_jdk by JetBrains.

the class LFGarbageCollectedTest method collectLambdaForm.

private void collectLambdaForm() throws IllegalAccessException {
    // Usually, 2 System.GCs are necessary to enqueue a SoftReference.
    System.gc();
    System.gc();
    Reference ref = null;
    for (int i = 0; i < 10; i++) {
        try {
            ref = rq.remove(1000);
        } catch (InterruptedException e) {
        /* ignore */
        }
        if (ref != null) {
            break;
        }
        // If the reference hasn't been queued yet, trigger one more GC.
        System.gc();
    }
    if (ref == null) {
        dumpTestData();
        System.err.println("Method type: " + mtype);
        System.err.println("LambdaForm:  " + REF_FIELD.get(ph));
        if (HEAP_DUMP) {
            // Trigger OOM to force heap dump for post-mortem analysis.
            val = new long[1_000_000_000];
        }
        throw new AssertionError("Error: LambdaForm is not garbage collected");
    }
    ;
}

Example 54 with Reference

use of java.lang.ref.Reference in project jdk8u_jdk by JetBrains.

the class ConnectionAcceptor method checkConnectPermission.

/**
     * Checks if the current caller has sufficient privilege to make
     * a connection to the remote endpoint.
     * @exception SecurityException if caller is not allowed to use this
     * Channel.
     */
private void checkConnectPermission() throws SecurityException {
    SecurityManager security = System.getSecurityManager();
    if (security == null)
        return;
    if (security != cacheSecurityManager) {
        // The security manager changed: flush the cache
        okContext = null;
        authcache = new WeakHashMap<AccessControlContext, Reference<AccessControlContext>>();
        cacheSecurityManager = security;
    }
    AccessControlContext ctx = AccessController.getContext();
    // appears in the cache, bypass the checkConnect.
    if (okContext == null || !(okContext.equals(ctx) || authcache.containsKey(ctx))) {
        security.checkConnect(ep.getHost(), ep.getPort());
        authcache.put(ctx, new SoftReference<AccessControlContext>(ctx));
    // A WeakHashMap is transformed into a SoftHashSet by making
    // each value softly refer to its own key (Peter's idea).
    }
    okContext = ctx;
}

Example 55 with Reference

use of java.lang.ref.Reference in project cdap by caskdata.

the class BaseHiveExploreService method startUp.

@Override
protected void startUp() throws Exception {
    LOG.info("Starting {}...", BaseHiveExploreService.class.getSimpleName());
    HiveConf hiveConf = getHiveConf();
    setupSparkConf();
    cliService.init(hiveConf);
    cliService.start();
    metastoreClientsExecutorService.scheduleWithFixedDelay(new Runnable() {

        @Override
        public void run() {
            Reference<? extends Supplier<IMetaStoreClient>> ref = metastoreClientReferenceQueue.poll();
            while (ref != null) {
                IMetaStoreClient client = metastoreClientReferences.remove(ref);
                if (client != null) {
                    closeMetastoreClient(client);
                }
                ref = metastoreClientReferenceQueue.poll();
            }
        }
    }, METASTORE_CLIENT_CLEANUP_PERIOD, METASTORE_CLIENT_CLEANUP_PERIOD, TimeUnit.SECONDS);
    // Schedule the cache cleanup
    scheduledExecutorService.scheduleWithFixedDelay(new Runnable() {

        @Override
        public void run() {
            runCacheCleanup();
        }
    }, cleanupJobSchedule, cleanupJobSchedule, TimeUnit.SECONDS);
}