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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.documentapi.messagebus.protocol;
import com.yahoo.config.subscription.ConfigSourceSet;
import com.yahoo.config.subscription.ConfigSubscriber;
import com.yahoo.jrt.Supervisor;
import com.yahoo.jrt.Transport;
import com.yahoo.jrt.slobrok.api.IMirror;
import com.yahoo.jrt.slobrok.api.Mirror;
import com.yahoo.jrt.slobrok.api.SlobrokList;
import com.yahoo.messagebus.routing.RoutingContext;
import com.yahoo.cloud.config.SlobroksConfig;
import java.util.List;
import java.util.Map;
/**
* Abstract class for policies that allow you to specify which slobrok to use for the
* routing.
*/
public abstract class ExternalSlobrokPolicy extends AsyncInitializationPolicy implements ConfigSubscriber.SingleSubscriber<SlobroksConfig> {
String error;
private Supervisor orb = null;
private Mirror mirror = null;
private SlobrokList slobroks = null;
private boolean firstTry = true;
private ConfigSubscriber subscriber;
String[] configSources = null;
private final static String slobrokConfigId = "admin/slobrok.0";
ExternalSlobrokPolicy(Map<String, String> param) {
super();
String conf = param.get("config");
if (conf != null) {
configSources = conf.split(",");
}
String slbrk = param.get("slobroks");
if (slbrk != null) {
slobroks = new SlobrokList();
slobroks.setup(slbrk.split(","));
}
if (slobroks != null || configSources != null) {
needAsynchronousInitialization();
}
}
@Override
public void init() {
if (slobroks != null) {
orb = new Supervisor(new Transport());
mirror = new Mirror(orb, slobroks);
}
if (configSources != null) {
if (mirror == null) {
orb = new Supervisor(new Transport());
subscriber = subscribe(slobrokConfigId, new ConfigSourceSet(configSources));
}
}
}
private ConfigSubscriber subscribe(String configId, final ConfigSourceSet configSourceSet) {
ConfigSubscriber subscriber = new ConfigSubscriber(configSourceSet);
subscriber.subscribe(this, SlobroksConfig.class, configId);
return subscriber;
}
public IMirror getMirror() {
return mirror;
}
public List<Mirror.Entry> lookup(RoutingContext context, String pattern) {
IMirror mirror1 = (mirror != null ? mirror : context.getMirror());
List<Mirror.Entry> arr = mirror1.lookup(pattern);
if ((arr.isEmpty()) && firstTry) {
synchronized(this) {
try {
int count = 0;
while (arr.isEmpty() && count < 100) {
Thread.sleep(50);
arr = mirror1.lookup(pattern);
count++;
}
} catch (InterruptedException e) {
}
}
}
firstTry = false;
return arr;
}
@Override
public synchronized void configure(SlobroksConfig config) {
String[] slist = new String[config.slobrok().size()];
for(int i = 0; i < config.slobrok().size(); i++) {
slist[i] = config.slobrok(i).connectionspec();
}
if (slobroks == null) {
slobroks = new SlobrokList();
}
slobroks.setup(slist);
if (mirror == null) {
mirror = new Mirror(orb, slobroks);
}
}
@Override
public void destroy() {
if (subscriber!=null) subscriber.close();
}
}
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