/**
* Copyright (c) 2013, impossibl.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of impossibl.com nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.impossibl.postgres.protocol.v30;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import static java.lang.Runtime.getRuntime;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.PooledByteBufAllocator;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.util.ThreadDeathWatcher;
import io.netty.util.concurrent.Future;
public class ProtocolShared {
public class Ref {
private boolean released;
public ProtocolShared get() {
return ProtocolShared.this;
}
public void release() {
if (!released) {
released = true;
ProtocolShared.this.release();
}
}
}
static ProtocolShared instance;
public static synchronized Ref acquire() {
if (instance == null) {
instance = new ProtocolShared();
}
return instance.addReference();
}
private Bootstrap bootstrap;
private int count = 0;
public Bootstrap getBootstrap() {
return bootstrap;
}
private synchronized Ref addReference() {
if (count == 0) {
init();
}
count++;
return new Ref();
}
private synchronized void release() {
if (count == 1) {
shutdown();
count = 0;
}
else {
count--;
}
}
private void init() {
int workerCount = getRuntime().availableProcessors();
NioEventLoopGroup group = new NioEventLoopGroup(workerCount, new NamedThreadFactory("PG-JDBC EventLoop"));
bootstrap = new Bootstrap();
bootstrap.group(group).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new MessageDecoder(), new MessageHandler());
}
}).option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT);
}
public Future<?> shutdown() {
return bootstrap.group().shutdownGracefully(10, 100, TimeUnit.MILLISECONDS);
}
public void waitForShutdown() {
Future<?> term = shutdown();
try {
ThreadDeathWatcher.awaitInactivity(5, TimeUnit.SECONDS);
}
catch (InterruptedException e) {
// Ignore
}
term.awaitUninterruptibly();
}
}
class NamedThreadFactory implements ThreadFactory {
private String baseName;
private AtomicInteger idx = new AtomicInteger(1);
public NamedThreadFactory(String baseName) {
super();
this.baseName = baseName;
}
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r, baseName + " (" + idx.getAndIncrement() + ")");
thread.setDaemon(true);
if (thread.getPriority() != Thread.NORM_PRIORITY)
thread.setPriority(Thread.NORM_PRIORITY);
return thread;
}
}