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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.remoting.exchange.support.header;
import org.apache.dubbo.common.Parameters;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.Version;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.timer.HashedWheelTimer;
import org.apache.dubbo.common.utils.Assert;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.NamedThreadFactory;
import org.apache.dubbo.remoting.Channel;
import org.apache.dubbo.remoting.ChannelHandler;
import org.apache.dubbo.remoting.Constants;
import org.apache.dubbo.remoting.RemotingException;
import org.apache.dubbo.remoting.RemotingServer;
import org.apache.dubbo.remoting.exchange.ExchangeChannel;
import org.apache.dubbo.remoting.exchange.ExchangeServer;
import org.apache.dubbo.remoting.exchange.Request;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import static java.util.Collections.unmodifiableCollection;
import static org.apache.dubbo.common.constants.CommonConstants.READONLY_EVENT;
import static org.apache.dubbo.remoting.Constants.HEARTBEAT_CHECK_TICK;
import static org.apache.dubbo.remoting.Constants.LEAST_HEARTBEAT_DURATION;
import static org.apache.dubbo.remoting.Constants.TICKS_PER_WHEEL;
import static org.apache.dubbo.remoting.utils.UrlUtils.getHeartbeat;
import static org.apache.dubbo.remoting.utils.UrlUtils.getIdleTimeout;
/**
* ExchangeServerImpl
*/
public class HeaderExchangeServer implements ExchangeServer {
protected final Logger logger = LoggerFactory.getLogger(getClass());
private final RemotingServer server;
private AtomicBoolean closed = new AtomicBoolean(false);
private static final HashedWheelTimer IDLE_CHECK_TIMER = new HashedWheelTimer(new NamedThreadFactory("dubbo-server-idleCheck", true), 1,
TimeUnit.SECONDS, TICKS_PER_WHEEL);
private CloseTimerTask closeTimerTask;
public HeaderExchangeServer(RemotingServer server) {
Assert.notNull(server, "server == null");
this.server = server;
startIdleCheckTask(getUrl());
}
public RemotingServer getServer() {
return server;
}
@Override
public boolean isClosed() {
return server.isClosed();
}
private boolean isRunning() {
Collection channels = getChannels();
for (Channel channel : channels) {
/**
* If there are any client connections,
* our server should be running.
*/
if (channel.isConnected()) {
return true;
}
}
return false;
}
@Override
public void close() {
doClose();
server.close();
}
@Override
public void close(final int timeout) {
startClose();
if (timeout > 0) {
final long max = timeout;
final long start = System.currentTimeMillis();
if (getUrl().getParameter(Constants.CHANNEL_SEND_READONLYEVENT_KEY, true)) {
sendChannelReadOnlyEvent();
}
while (isRunning() && System.currentTimeMillis() - start < max) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
logger.warn(e.getMessage(), e);
}
}
}
doClose();
server.close(timeout);
}
@Override
public void startClose() {
server.startClose();
}
private void sendChannelReadOnlyEvent() {
Request request = new Request();
request.setEvent(READONLY_EVENT);
request.setTwoWay(false);
request.setVersion(Version.getProtocolVersion());
Collection channels = getChannels();
for (Channel channel : channels) {
try {
if (channel.isConnected()) {
channel.send(request, getUrl().getParameter(Constants.CHANNEL_READONLYEVENT_SENT_KEY, true));
}
} catch (RemotingException e) {
logger.warn("send cannot write message error.", e);
}
}
}
private void doClose() {
if (!closed.compareAndSet(false, true)) {
return;
}
cancelCloseTask();
}
private void cancelCloseTask() {
if (closeTimerTask != null) {
closeTimerTask.cancel();
}
}
@Override
public Collection getExchangeChannels() {
Collection exchangeChannels = new ArrayList();
Collection channels = server.getChannels();
if (CollectionUtils.isNotEmpty(channels)) {
for (Channel channel : channels) {
exchangeChannels.add(HeaderExchangeChannel.getOrAddChannel(channel));
}
}
return exchangeChannels;
}
@Override
public ExchangeChannel getExchangeChannel(InetSocketAddress remoteAddress) {
Channel channel = server.getChannel(remoteAddress);
return HeaderExchangeChannel.getOrAddChannel(channel);
}
@Override
@SuppressWarnings({"unchecked", "rawtypes"})
public Collection getChannels() {
return (Collection) getExchangeChannels();
}
@Override
public Channel getChannel(InetSocketAddress remoteAddress) {
return getExchangeChannel(remoteAddress);
}
@Override
public boolean isBound() {
return server.isBound();
}
@Override
public InetSocketAddress getLocalAddress() {
return server.getLocalAddress();
}
@Override
public URL getUrl() {
return server.getUrl();
}
@Override
public ChannelHandler getChannelHandler() {
return server.getChannelHandler();
}
@Override
public void reset(URL url) {
server.reset(url);
try {
int currHeartbeat = getHeartbeat(getUrl());
int currIdleTimeout = getIdleTimeout(getUrl());
int heartbeat = getHeartbeat(url);
int idleTimeout = getIdleTimeout(url);
if (currHeartbeat != heartbeat || currIdleTimeout != idleTimeout) {
cancelCloseTask();
startIdleCheckTask(url);
}
} catch (Throwable t) {
logger.error(t.getMessage(), t);
}
}
@Override
@Deprecated
public void reset(Parameters parameters) {
reset(getUrl().addParameters(parameters.getParameters()));
}
@Override
public void send(Object message) throws RemotingException {
if (closed.get()) {
throw new RemotingException(this.getLocalAddress(), null, "Failed to send message " + message
+ ", cause: The server " + getLocalAddress() + " is closed!");
}
server.send(message);
}
@Override
public void send(Object message, boolean sent) throws RemotingException {
if (closed.get()) {
throw new RemotingException(this.getLocalAddress(), null, "Failed to send message " + message
+ ", cause: The server " + getLocalAddress() + " is closed!");
}
server.send(message, sent);
}
/**
* Each interval cannot be less than 1000ms.
*/
private long calculateLeastDuration(int time) {
if (time / HEARTBEAT_CHECK_TICK <= 0) {
return LEAST_HEARTBEAT_DURATION;
} else {
return time / HEARTBEAT_CHECK_TICK;
}
}
private void startIdleCheckTask(URL url) {
if (!server.canHandleIdle()) {
AbstractTimerTask.ChannelProvider cp = () -> unmodifiableCollection(HeaderExchangeServer.this.getChannels());
int idleTimeout = getIdleTimeout(url);
long idleTimeoutTick = calculateLeastDuration(idleTimeout);
CloseTimerTask closeTimerTask = new CloseTimerTask(cp, idleTimeoutTick, idleTimeout);
this.closeTimerTask = closeTimerTask;
// init task and start timer.
IDLE_CHECK_TIMER.newTimeout(closeTimerTask, idleTimeoutTick, TimeUnit.MILLISECONDS);
}
}
}