com.uber.tchannel.channels.Peer.java Source code

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Here is the source code for com.uber.tchannel.channels.Peer.java

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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<ChannelId, Connection> 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<String, String>() {
                });
        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<String, Integer> 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<String, Integer> result = new HashMap<>();
        result.put("connections.in", in);
        result.put("connections.out", out);
        return result;
    }
}