com.hotels.styx.server.netty.eventloop.ServerEventLoopFactories Maven / Gradle / Ivy
/*
Copyright (C) 2013-2020 Expedia 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 com.hotels.styx.server.netty.eventloop;
import com.hotels.styx.server.ServerEventLoopFactory;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.ServerChannel;
import static java.util.Objects.requireNonNull;
/**
* Static utility methods pertaining to {@code ServerEventLoopFactory} instances.
*/
public final class ServerEventLoopFactories {
private ServerEventLoopFactories() {
}
/**
* Returns a ServerEventLoopFactory which caches the instance retrieved during the first
* call to {@code newBossEventLoopGroup}, {@code newWorkerEventLoopGroup} and returns that value on subsequent calls.
*/
public static ServerEventLoopFactory memoize(ServerEventLoopFactory serverEventLoopFactory) {
return new MemoizingServerEventLoopFactory(requireNonNull(serverEventLoopFactory));
}
private static class MemoizingServerEventLoopFactory implements ServerEventLoopFactory {
private final EventLoopGroup bossEventExecutors;
private final EventLoopGroup workerEventExecutors;
private final Class serverChannelClass;
public MemoizingServerEventLoopFactory(ServerEventLoopFactory delegate) {
this.bossEventExecutors = delegate.newBossEventLoopGroup();
this.workerEventExecutors = delegate.newWorkerEventLoopGroup();
this.serverChannelClass = delegate.serverChannelClass();
}
@Override
public EventLoopGroup newBossEventLoopGroup() {
return bossEventExecutors;
}
@Override
public EventLoopGroup newWorkerEventLoopGroup() {
return workerEventExecutors;
}
@Override
public Class serverChannelClass() {
return serverChannelClass;
}
}
}