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/*
* Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.nio.tcp.nonblocking;
import com.hazelcast.instance.HazelcastThreadGroup;
import com.hazelcast.internal.metrics.MetricsRegistry;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.LoggingService;
import com.hazelcast.nio.IOService;
import com.hazelcast.nio.tcp.IOThreadingModel;
import com.hazelcast.nio.tcp.SocketReader;
import com.hazelcast.nio.tcp.TcpIpConnection;
import com.hazelcast.nio.tcp.SocketWriter;
import com.hazelcast.nio.tcp.nonblocking.iobalancer.IOBalancer;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.util.concurrent.atomic.AtomicInteger;
import static com.hazelcast.util.HashUtil.hashToIndex;
import static java.lang.Boolean.getBoolean;
import static java.util.logging.Level.FINE;
import static java.util.logging.Level.INFO;
/**
* A non blocking {@link IOThreadingModel} implementation that makes use of {@link java.nio.channels.Selector} to have a
* limited set of io threads, handle an arbitrary number of connections.
*
* By default the {@link NonBlockingIOThread} blocks on the Selector, but it can be put in a 'selectNow' mode that makes it
* spinning on the selector. This is an experimental feature and will cause the io threads to run hot. For this reason, when
* this feature is enabled, the number of io threads should be reduced (preferably 1).
*/
public class NonBlockingIOThreadingModel implements IOThreadingModel {
private final NonBlockingIOThread[] inputThreads;
private final NonBlockingIOThread[] outputThreads;
private final AtomicInteger nextInputThreadIndex = new AtomicInteger();
private final AtomicInteger nextOutputThreadIndex = new AtomicInteger();
private final ILogger logger;
private final IOService ioService;
private final MetricsRegistry metricsRegistry;
private final LoggingService loggingService;
private final HazelcastThreadGroup hazelcastThreadGroup;
// experimental settings; will be disabled by default.
private boolean inputSelectNow = getBoolean("hazelcast.io.input.thread.selectNow");
private boolean outputSelectNow = getBoolean("hazelcast.io.output.thread.selectNow");
private volatile IOBalancer ioBalancer;
public NonBlockingIOThreadingModel(
IOService ioService,
LoggingService loggingService,
MetricsRegistry metricsRegistry,
HazelcastThreadGroup hazelcastThreadGroup) {
this.ioService = ioService;
this.hazelcastThreadGroup = hazelcastThreadGroup;
this.metricsRegistry = metricsRegistry;
this.loggingService = loggingService;
this.logger = loggingService.getLogger(NonBlockingIOThreadingModel.class);
this.inputThreads = new NonBlockingIOThread[ioService.getInputSelectorThreadCount()];
this.outputThreads = new NonBlockingIOThread[ioService.getOutputSelectorThreadCount()];
}
public void setInputSelectNow(boolean enabled) {
this.inputSelectNow = enabled;
}
public void setOutputSelectNow(boolean enabled) {
this.outputSelectNow = enabled;
}
@Override
public boolean isBlocking() {
return false;
}
@SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "used only for testing")
public NonBlockingIOThread[] getInputThreads() {
return inputThreads;
}
@SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "used only for testing")
public NonBlockingIOThread[] getOutputThreads() {
return outputThreads;
}
public IOBalancer getIOBalancer() {
return ioBalancer;
}
@Override
public void start() {
logger.info("TcpIpConnectionManager configured with Non Blocking IO-threading model: "
+ inputThreads.length + " input threads and "
+ outputThreads.length + " output threads");
logger.log(inputSelectNow ? INFO : FINE, "InputThreads selectNow enabled=" + inputSelectNow);
logger.log(outputSelectNow ? INFO : FINE, "OutputThreads selectNow enabled=" + outputSelectNow);
NonBlockingIOThreadOutOfMemoryHandler oomeHandler = new NonBlockingIOThreadOutOfMemoryHandler() {
@Override
public void handle(OutOfMemoryError error) {
ioService.onOutOfMemory(error);
}
};
for (int i = 0; i < inputThreads.length; i++) {
NonBlockingIOThread thread = new NonBlockingIOThread(
ioService.getThreadGroup(),
ioService.getThreadPrefix() + "in-" + i,
ioService.getLogger(NonBlockingIOThread.class.getName()),
oomeHandler,
inputSelectNow
);
inputThreads[i] = thread;
metricsRegistry.scanAndRegister(thread, "tcp." + thread.getName());
thread.start();
}
for (int i = 0; i < outputThreads.length; i++) {
NonBlockingIOThread thread = new NonBlockingIOThread(
ioService.getThreadGroup(),
ioService.getThreadPrefix() + "out-" + i,
ioService.getLogger(NonBlockingIOThread.class.getName()),
oomeHandler,
outputSelectNow);
outputThreads[i] = thread;
metricsRegistry.scanAndRegister(thread, "tcp." + thread.getName());
thread.start();
}
startIOBalancer();
}
@Override
public void onConnectionAdded(TcpIpConnection connection) {
ioBalancer.connectionAdded(connection);
}
@Override
public void onConnectionRemoved(TcpIpConnection connection) {
ioBalancer.connectionRemoved(connection);
}
private void startIOBalancer() {
ioBalancer = new IOBalancer(inputThreads, outputThreads,
hazelcastThreadGroup, ioService.getBalancerIntervalSeconds(), loggingService);
ioBalancer.start();
metricsRegistry.scanAndRegister(ioBalancer, "tcp.balancer");
}
@Override
public void shutdown() {
ioBalancer.stop();
if (logger.isFinestEnabled()) {
logger.finest("Shutting down IO selectors... Total: " + (inputThreads.length + outputThreads.length));
}
shutdown(inputThreads);
shutdown(outputThreads);
}
private void shutdown(NonBlockingIOThread[] threads) {
for (int i = 0; i < threads.length; i++) {
NonBlockingIOThread ioThread = threads[i];
if (ioThread != null) {
ioThread.shutdown();
}
threads[i] = null;
}
}
@Override
public SocketWriter newSocketWriter(TcpIpConnection connection) {
int index = hashToIndex(nextOutputThreadIndex.getAndIncrement(), outputThreads.length);
return new NonBlockingSocketWriter(connection, outputThreads[index], metricsRegistry);
}
@Override
public SocketReader newSocketReader(TcpIpConnection connection) {
int index = hashToIndex(nextInputThreadIndex.getAndIncrement(), inputThreads.length);
return new NonBlockingSocketReader(connection, inputThreads[index], metricsRegistry);
}
}
