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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.messagebus;
import com.yahoo.concurrent.SystemTimer;
import com.yahoo.messagebus.metrics.RouteMetricSet;
import com.yahoo.messagebus.network.Network;
import com.yahoo.messagebus.routing.Resender;
import com.yahoo.messagebus.routing.RoutingNode;
import com.yahoo.log.LogLevel;
import java.util.logging.Logger;
/**
* This class owns a message that is being sent by message bus. Once a reply is received, the message is attached to it
* and returned to the application. This also implements the discard policy of {@link RoutingNode}.
*
* @author Simon Thoresen Hult
*/
public class SendProxy implements MessageHandler, ReplyHandler {
private static final Logger log = Logger.getLogger(SendProxy.class.getName());
private final MessageBus mbus;
private final Network net;
private final Resender resender;
private Message msg = null;
private boolean logTrace = false;
private final long sendTime;
/**
* Constructs a new instance of this class to maintain sending of a single message.
*
* @param mbus The message bus that owns this.
* @param net The network layer to transmit through.
* @param resender The resender to use.
*/
public SendProxy(MessageBus mbus, Network net, Resender resender) {
this.mbus = mbus;
this.net = net;
this.resender = resender;
sendTime = SystemTimer.INSTANCE.milliTime();
}
public void handleMessage(Message msg) {
Trace trace = msg.getTrace();
if (trace.getLevel() == 0) {
if (log.isLoggable(LogLevel.SPAM)) {
trace.setLevel(9);
logTrace = true;
} else if (log.isLoggable(LogLevel.DEBUG)) {
trace.setLevel(6);
logTrace = true;
}
}
this.msg = msg;
RoutingNode root = new RoutingNode(mbus, net, resender, this, msg);
root.send();
}
public void handleReply(Reply reply) {
if (reply == null) {
msg.discard();
} else {
Trace trace = msg.getTrace();
if (logTrace) {
if (reply.hasErrors()) {
log.log(LogLevel.DEBUG, "Trace for reply with error(s):\n" + reply.getTrace());
} else if (log.isLoggable(LogLevel.SPAM)) {
log.log(LogLevel.SPAM, "Trace for reply:\n" + reply.getTrace());
}
Trace empty = new Trace();
trace.swap(empty);
} else if (trace.getLevel() > 0) {
trace.getRoot().addChild(reply.getTrace().getRoot());
trace.getRoot().normalize();
}
reply.swapState(msg);
reply.setMessage(msg);
if (msg.getRoute() != null) {
RouteMetricSet metrics = mbus.getMetrics().getRouteMetrics(msg.getRoute());
for (int i = 0; i < reply.getNumErrors(); i++) {
metrics.addFailure(reply.getError(i));
}
if (reply.getNumErrors() == 0) {
metrics.latency.addValue(msg.getTimeReceived() - sendTime);
}
}
ReplyHandler handler = reply.popHandler();
handler.handleReply(reply);
}
}
}
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