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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.messagebus.network.local;
import com.yahoo.component.Vtag;
import com.yahoo.jrt.slobrok.api.IMirror;
import com.yahoo.messagebus.EmptyReply;
import com.yahoo.messagebus.Error;
import com.yahoo.messagebus.Message;
import com.yahoo.messagebus.Reply;
import com.yahoo.messagebus.ReplyHandler;
import com.yahoo.messagebus.Routable;
import com.yahoo.messagebus.TraceNode;
import com.yahoo.messagebus.network.Network;
import com.yahoo.messagebus.network.NetworkOwner;
import com.yahoo.messagebus.network.ServiceAddress;
import com.yahoo.messagebus.routing.RoutingNode;
import com.yahoo.text.Utf8String;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import static com.yahoo.messagebus.ErrorCode.NO_ADDRESS_FOR_SERVICE;
/**
* @author Simon Thoresen Hult
*/
public class LocalNetwork implements Network {
private final Executor executor = Executors.newSingleThreadExecutor();
private final LocalWire wire;
private final String hostId;
private volatile NetworkOwner owner;
public LocalNetwork() {
this(new LocalWire());
}
public LocalNetwork(LocalWire wire) {
this.wire = wire;
this.hostId = wire.newHostId();
}
@Override
public boolean waitUntilReady(double seconds) {
return true;
}
@Override
public void attach(NetworkOwner owner) {
this.owner = owner;
}
@Override
public void registerSession(String session) {
wire.registerService(hostId + "/" + session, this);
}
@Override
public void unregisterSession(String session) {
wire.unregisterService(hostId + "/" + session);
}
@Override
public boolean allocServiceAddress(RoutingNode recipient) {
String service = recipient.getRoute().getHop(0).getServiceName();
ServiceAddress address = wire.resolveServiceAddress(service);
if (address == null) {
recipient.setError(new Error(NO_ADDRESS_FOR_SERVICE, "No address for service '" + service + "'."));
return false;
}
recipient.setServiceAddress(address);
return true;
}
@Override
public void freeServiceAddress(RoutingNode recipient) {
recipient.setServiceAddress(null);
}
@Override
public void send(Message msg, List<RoutingNode> recipients) {
for (RoutingNode recipient : recipients) {
new MessageEnvelope(this, msg, recipient).send();
}
}
private void receiveLater(MessageEnvelope envelope) {
byte[] payload = envelope.sender.encode(envelope.msg.getProtocol(), envelope.msg);
executor.execute(new Runnable() {
@Override
public void run() {
Message msg = decode(envelope.msg.getProtocol(), payload, Message.class);
msg.getTrace().setLevel(envelope.msg.getTrace().getLevel());
msg.setRoute(envelope.msg.getRoute()).getRoute().removeHop(0);
msg.setRetryEnabled(envelope.msg.getRetryEnabled());
msg.setRetry(envelope.msg.getRetry());
msg.setTimeRemaining(envelope.msg.getTimeRemainingNow());
msg.pushHandler(reply -> new ReplyEnvelope(LocalNetwork.this, envelope, reply).send());
owner.deliverMessage(msg, ((LocalServiceAddress) envelope.recipient.getServiceAddress()).getSessionName());
}
});
}
private void receiveLater(ReplyEnvelope envelope) {
byte[] payload = envelope.sender.encode(envelope.reply.getProtocol(), envelope.reply);
executor.execute(() -> {
Reply reply = decode(envelope.reply.getProtocol(), payload, Reply.class);
reply.setRetryDelay(envelope.reply.getRetryDelay());
reply.getTrace().getRoot().addChild(TraceNode.decode(envelope.reply.getTrace().getRoot().encode()));
for (int i = 0, len = envelope.reply.getNumErrors(); i < len; ++i) {
Error error = envelope.reply.getError(i);
reply.addError(new Error(error.getCode(),
error.getMessage(),
error.getService() != null ? error.getService() : envelope.sender.hostId));
}
envelope.parent.recipient.handleReply(reply);
});
}
private byte[] encode(Utf8String protocolName, Routable toEncode) {
if (toEncode.getType() == 0) {
return new byte[0];
}
return owner.getProtocol(protocolName).encode(Vtag.currentVersion, toEncode);
}
private <T extends Routable> T decode(Utf8String protocolName, byte[] toDecode, Class<T> clazz) {
return clazz.cast(toDecode.length == 0 ? new EmptyReply()
: owner.getProtocol(protocolName).decode(Vtag.currentVersion, toDecode));
}
@Override
public void sync() { }
@Override
public void shutdown() { }
@Override
public String getConnectionSpec() {
return hostId;
}
@Override
public IMirror getMirror() {
return wire;
}
private static class MessageEnvelope {
final LocalNetwork sender;
final Message msg;
final RoutingNode recipient;
MessageEnvelope(LocalNetwork sender, Message msg, RoutingNode recipient) {
this.sender = sender;
this.msg = msg;
this.recipient = recipient;
}
void send() {
((LocalServiceAddress) recipient.getServiceAddress()).getNetwork().receiveLater(this);
}
}
private static class ReplyEnvelope {
final LocalNetwork sender;
final MessageEnvelope parent;
final Reply reply;
ReplyEnvelope(LocalNetwork sender, MessageEnvelope parent, Reply reply) {
this.sender = sender;
this.parent = parent;
this.reply = reply;
}
void send() {
parent.sender.receiveLater(this);
}
}
}
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