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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.p2p.support;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.utils.ExecutorUtil;
import org.apache.dubbo.common.utils.IOUtils;
import org.apache.dubbo.common.utils.NamedThreadFactory;
import org.apache.dubbo.common.utils.NetUtils;
import org.apache.dubbo.remoting.ChannelHandler;
import org.apache.dubbo.remoting.RemotingException;
import org.apache.dubbo.remoting.p2p.Peer;
import java.io.File;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
/**
* FileGroup
*/
public class FileGroup extends AbstractGroup {
private final File file;
// Scheduled executor service
private final ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(3, new NamedThreadFactory("FileGroupModifiedChecker", true));
// Reconnect the timer to check whether the connection is available at a time, and when unavailable, an infinite reconnection
private final ScheduledFuture checkModifiedFuture;
private volatile long last;
public FileGroup(URL url) {
super(url);
String path = url.getAbsolutePath();
file = new File(path);
checkModifiedFuture = scheduledExecutorService.scheduleWithFixedDelay(new Runnable() {
@Override
public void run() {
// Check the file change
try {
check();
} catch (Throwable t) { // Defensive fault tolerance
logger.error("Unexpected error occur at reconnect, cause: " + t.getMessage(), t);
}
}
}, 2000, 2000, TimeUnit.MILLISECONDS);
}
@Override
public void close() {
super.close();
try {
ExecutorUtil.cancelScheduledFuture(checkModifiedFuture);
} catch (Throwable t) {
logger.error(t.getMessage(), t);
}
}
private void check() throws RemotingException {
long modified = file.lastModified();
if (modified > last) {
last = modified;
changed();
}
}
private void changed() throws RemotingException {
try {
String[] lines = IOUtils.readLines(file);
for (String line : lines) {
connect(URL.valueOf(line));
}
} catch (IOException e) {
throw new RemotingException(new InetSocketAddress(NetUtils.getLocalHost(), 0), getUrl().toInetSocketAddress(), e.getMessage(), e);
}
}
@Override
public Peer join(URL url, ChannelHandler handler) throws RemotingException {
Peer peer = super.join(url, handler);
try {
String full = url.toFullString();
String[] lines = IOUtils.readLines(file);
for (String line : lines) {
if (full.equals(line)) {
return peer;
}
}
IOUtils.appendLines(file, new String[]{full});
} catch (IOException e) {
throw new RemotingException(new InetSocketAddress(NetUtils.getLocalHost(), 0), getUrl().toInetSocketAddress(), e.getMessage(), e);
}
return peer;
}
@Override
public void leave(URL url) throws RemotingException {
super.leave(url);
try {
String full = url.toFullString();
String[] lines = IOUtils.readLines(file);
List saves = new ArrayList();
for (String line : lines) {
if (full.equals(line)) {
return;
}
saves.add(line);
}
IOUtils.appendLines(file, saves.toArray(new String[0]));
} catch (IOException e) {
throw new RemotingException(new InetSocketAddress(NetUtils.getLocalHost(), 0), getUrl().toInetSocketAddress(), e.getMessage(), e);
}
}
}