io.reactivex.mantis.network.push.RoundRobinRouter Maven / Gradle / Ivy
/*
* Copyright 2019 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.reactivex.mantis.network.push;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
import rx.functions.Func1;
public class RoundRobinRouter extends Router {
public RoundRobinRouter(String name, Func1 encoder) {
super("RoundRobinRouter_" + name, encoder);
}
@Override
public void route(Set> connections, List chunks) {
if (chunks != null && !chunks.isEmpty()) {
numEventsProcessed.increment(chunks.size());
}
List> randomOrder = new ArrayList<>(connections);
Collections.shuffle(randomOrder);
if (chunks != null && !chunks.isEmpty() && !randomOrder.isEmpty()) {
Iterator> iter = loopingIterator(randomOrder);
Map, List> writes = new HashMap<>();
// process chunks
for (T chunk : chunks) {
AsyncConnection connection = iter.next();
Func1 predicate = connection.getPredicate();
if (predicate == null || predicate.call(chunk)) {
List buffer = writes.get(connection);
if (buffer == null) {
buffer = new LinkedList<>();
writes.put(connection, buffer);
}
buffer.add(encoder.call(chunk));
}
}
if (!writes.isEmpty()) {
for (Entry, List> entry : writes.entrySet()) {
AsyncConnection connection = entry.getKey();
List toWrite = entry.getValue();
connection.write(toWrite);
numEventsRouted.increment(toWrite.size());
}
}
}
}
private Iterator> loopingIterator(final Collection> connections) {
final AtomicReference>> iterRef = new AtomicReference<>(connections.iterator());
return
new Iterator>() {
@Override
public boolean hasNext() {
return true;
}
@Override
public AsyncConnection next() {
Iterator> iter = iterRef.get();
if (iter.hasNext()) {
return iter.next();
} else {
iterRef.set(connections.iterator());
return iterRef.get().next();
}
}
};
}
}