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/*
* Copyright (c) 2015 Uber Technologies, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.uber.tchannel.channels;
import java.net.SocketAddress;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.HashMap;
import com.uber.tchannel.api.errors.TChannelConnectionFailure;
import com.uber.tchannel.codecs.MessageCodec;
import com.uber.tchannel.frames.InitFrame;
import com.uber.tchannel.frames.InitRequestFrame;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelId;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
/**
* Peer manages connections to/from the same host_port. It provides a way to choose connections based on
* their current status, e.g., connected, identified, etc.
*/
public class Peer {
public ConcurrentHashMap connections = new ConcurrentHashMap<>();
public SocketAddress remoteAddress = null;
private PeerManager manager;
public Peer(PeerManager manager, SocketAddress remoteAddress) {
this.manager = manager;
this.remoteAddress = remoteAddress;
}
public Connection add(Connection connection) {
Connection conn = connections.putIfAbsent(connection.channel().id(), connection);
if (conn != null) {
return conn;
}
return connection;
}
public Connection add(Channel channel, Connection.Direction direction) {
Connection conn = connections.get(channel.id());
if (conn != null) {
return conn;
}
return add(new Connection(this, channel, direction));
}
public Connection handleActiveOutConnection(ChannelHandlerContext ctx) {
Channel channel = ctx.channel();
Connection conn = add(channel, Connection.Direction.OUT);
// Sending out the init request
InitRequestFrame initRequestFrame = new InitRequestFrame(0,
InitFrame.DEFAULT_VERSION,
new HashMap() { }
);
initRequestFrame.setHostPort(this.manager.getHostPort());
// TODO: figure out what to put here
initRequestFrame.setProcessName("java-process");
MessageCodec.write(ctx, initRequestFrame);
return conn;
}
public void remove(Connection connection) {
connections.remove(connection.channel().id());
}
public Connection remove(Channel channel) {
Connection conn = connections.remove(channel.id());
return conn;
}
public Connection connect(Bootstrap bootstrap, Connection.Direction preferredDirection) {
Connection conn = getConnection(ConnectionState.IDENTIFIED, preferredDirection);
if (conn != null && (
conn.satisfy(preferredDirection) || preferredDirection == Connection.Direction.IN)) {
return conn;
}
final ChannelFuture f = bootstrap.connect(remoteAddress);
Channel channel = f.channel();
final Connection connection = add(channel, Connection.Direction.OUT);
// handle connection errors
f.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (!future.isSuccess()) {
connection.setIndentified(new TChannelConnectionFailure(future.cause()));
}
}
});
return connection;
}
public Connection connect(Bootstrap bootstrap) {
return connect(bootstrap, Connection.Direction.NONE);
}
public Connection getConnection(ConnectionState preferedState, Connection.Direction preferredDirection) {
Connection conn = null;
Connection next = null;
for (ChannelId id : connections.keySet()) {
next = connections.get(id);
if (next.satisfy(preferedState)) {
conn = next;
if (preferredDirection == Connection.Direction.NONE
|| conn.direction == preferredDirection) {
break;
}
} else if (conn == null) {
conn = next;
}
}
return conn;
}
public Connection getConnection(ConnectionState preferedState) {
return getConnection(preferedState, Connection.Direction.NONE);
}
public Connection getConnection(ChannelId channelId) {
return connections.get(channelId);
}
public void close() {
for (ChannelId id : connections.keySet()) {
Connection conn = connections.get(id);
if (conn != null) {
conn.close();
}
}
this.connections.clear();
}
public Map getStats() {
int in = 0;
int out = 0;
for (ChannelId id : connections.keySet()) {
Connection conn = connections.get(id);
if (conn == null) {
continue;
} else if (conn.direction == Connection.Direction.OUT) {
out++;
} else {
in++;
}
}
Map result = new HashMap<>();
result.put("connections.in", in);
result.put("connections.out", out);
return result;
}
}
