org.apache.pulsar.common.util.netty.ChannelFutures Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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
*
* 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 org.apache.pulsar.common.util.netty;
import org.apache.pulsar.shade.io.netty.channel.Channel;
import org.apache.pulsar.shade.io.netty.channel.ChannelFuture;
import java.util.Objects;
import java.util.concurrent.CompletableFuture;
/**
* Static utility methods for operating on {@link ChannelFuture}s.
*
*/
public class ChannelFutures {
private ChannelFutures() {
throw new AssertionError("Class with static utility methods only cannot be instantiated");
}
/**
* Convert a {@link ChannelFuture} into a {@link CompletableFuture}.
*
* @param channelFuture the {@link ChannelFuture}
* @return a {@link CompletableFuture} that completes successfully when the channelFuture completes successfully,
* and completes exceptionally if the channelFuture completes with a {@link Throwable}
*/
public static CompletableFuture toCompletableFuture(ChannelFuture channelFuture) {
Objects.requireNonNull(channelFuture, "channelFuture cannot be null");
CompletableFuture adapter = new CompletableFuture<>();
if (channelFuture.isDone()) {
if (channelFuture.isSuccess()) {
adapter.complete(channelFuture.channel());
} else {
adapter.completeExceptionally(channelFuture.cause());
}
} else {
channelFuture.addListener((ChannelFuture cf) -> {
if (cf.isSuccess()) {
adapter.complete(cf.channel());
} else {
adapter.completeExceptionally(cf.cause());
}
});
}
return adapter;
}
}