com.github.cm.heclouds.adapter.mqttadapter.mqtt.PromiseCanceller Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of protocol-adapter-sdk Show documentation

OneNET Studio泛协议接入SDK

There is a newer version: 1.0.4

/*
 * Copyright (C) 2018 Issey Yamakoshi
 *
 * 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.github.cm.heclouds.adapter.mqttadapter.mqtt;


import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import io.netty.util.concurrent.Promise;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import static java.util.Objects.requireNonNull;


public class PromiseCanceller implements GenericFutureListener> {

    private static final InternalLogger logger;

    static {
        logger = InternalLoggerFactory.getInstance(PromiseCanceller.class);
    }

    private final Promise promise;
    private final boolean mayInterruptIfRunning;

    public PromiseCanceller(Promise promise) {
        this(promise, false);
    }

    public PromiseCanceller(Promise promise, boolean mayInterruptIfRunning) {
        this.promise = requireNonNull(promise, "promise");
        this.mayInterruptIfRunning = mayInterruptIfRunning;
    }

    @Override
    public void operationComplete(Future future) throws Exception {
        if (future.isSuccess() || promise.isDone()) {
            // noop
        } else if (future.isCancelled() && promise.isCancellable()) {
            if (!promise.cancel(mayInterruptIfRunning)) {
                logger.warn("failed to cancel promise.");
            }
        } else {
            try {
                promise.setFailure(future.cause());
            } catch (IllegalStateException e) {
                logger.warn("failed to mark a promise as failure.", e);
            }
        }
    }
}