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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.messagebus.test;
import com.yahoo.component.Version;
import com.yahoo.messagebus.Protocol;
import com.yahoo.messagebus.Routable;
import com.yahoo.messagebus.routing.RoutingPolicy;
import com.yahoo.text.Utf8;
import com.yahoo.text.Utf8String;
import java.util.HashMap;
import java.util.Map;
/**
* @author Simon Thoresen Hult
*/
public class SimpleProtocol implements Protocol {
public static final Utf8String NAME = new Utf8String("Simple");
public static final int MESSAGE = 1;
public static final int REPLY = 2;
private final Map<String, PolicyFactory> policies = new HashMap<String, PolicyFactory>();
@Override
public String getName() {
return NAME.toString();
}
@Override
public RoutingPolicy createPolicy(String name, String param) {
if (policies.containsKey(name)) {
return policies.get(name).create(param);
}
return null;
}
@Override
public Routable decode(Version version, byte[] data) {
String str = Utf8.toString(data);
if (str.length() < 1) {
return null;
}
char c = str.charAt(0);
if (c == 'M') {
return new SimpleMessage(str.substring(1));
}
if (c == 'R') {
return new SimpleReply(str.substring(1));
}
return null;
}
@Override
public byte[] encode(Version version, Routable routable) {
if (routable.getType() == MESSAGE) {
return Utf8.toBytes("M" + ((SimpleMessage)routable).getValue());
} else if (routable.getType() == REPLY) {
return Utf8.toBytes("R" + ((SimpleReply)routable).getValue());
} else {
return null;
}
}
/**
* Registers a policy factory with this protocol under a given name. Whenever a policy is requested that matches
* this name, the factory is invoked.
*
* @param name The name of the policy.
* @param factory The policy factory.
*/
public void addPolicyFactory(String name, PolicyFactory factory) {
policies.put(name, factory);
}
/**
* Defines a policy factory interface that tests can use to register arbitrary policies with this protocol.
*/
public interface PolicyFactory {
/**
* Creates a new instance of the routing policy that this factory encapsulates.
*
* @param param The param for the policy constructor.
* @return The routing policy created.
*/
public RoutingPolicy create(String param);
}
}
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