forked from line/armeria
/
ChannelUtil.java
83 lines (68 loc) · 2.97 KB
/
ChannelUtil.java
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/*
* Copyright 2017 LINE Corporation
*
* LINE Corporation licenses this file to you 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:
*
* https://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.linecorp.armeria.internal;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.atomic.AtomicInteger;
import com.google.common.collect.ImmutableList;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.WriteBufferWaterMark;
import io.netty.channel.epoll.EpollEventLoopGroup;
public final class ChannelUtil {
private static final Class<? extends EventLoopGroup> EPOLL_EVENT_LOOP_CLASS;
static {
try {
//noinspection unchecked
EPOLL_EVENT_LOOP_CLASS = (Class<? extends EventLoopGroup>)
Class.forName("io.netty.channel.epoll.EpollEventLoop", false,
EpollEventLoopGroup.class.getClassLoader());
} catch (Exception e) {
throw new IllegalStateException("failed to locate EpollEventLoop class", e);
}
}
private static final WriteBufferWaterMark DISABLED_WRITE_BUFFER_WATERMARK =
new WriteBufferWaterMark(0, Integer.MAX_VALUE);
public static Class<? extends EventLoopGroup> epollEventLoopClass() {
return EPOLL_EVENT_LOOP_CLASS;
}
public static CompletableFuture<Void> close(Iterable<? extends Channel> channels) {
final List<Channel> channelsCopy = ImmutableList.copyOf(channels);
if (channelsCopy.isEmpty()) {
return CompletableFuture.completedFuture(null);
}
final AtomicInteger numChannelsToClose = new AtomicInteger(channelsCopy.size());
final CompletableFuture<Void> future = new CompletableFuture<>();
final ChannelFutureListener listener = unused -> {
if (numChannelsToClose.decrementAndGet() == 0) {
future.complete(null);
}
};
for (Channel ch : channelsCopy) {
ch.close().addListener(listener);
}
return future;
}
/**
* Disables the write buffer water mark of the specified {@link Channel}, because we do not use this
* feature at all and thus we do not want {@code channelWritabilityChanged} events triggered often.
*/
public static void disableWriterBufferWatermark(Channel channel) {
channel.config().setWriteBufferWaterMark(DISABLED_WRITE_BUFFER_WATERMARK);
}
private ChannelUtil() {}
}