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/*
 * JBoss, Home of Professional Open Source
 *
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.xnio.conduits;

import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import org.xnio.IoUtils;
import org.xnio.channels.CloseListenerSettable;
import org.xnio.channels.SuspendableWriteChannel;
import org.xnio.channels.WriteListenerSettable;

/**
 * A conduit write-ready handler.
 *
 * @author David M. Lloyd
 */
public interface WriteReadyHandler extends TerminateHandler {
    /**
     * Signify that writes are ready.
     */
    void writeReady();

    /**
     * A write ready handler which calls channel listener(s).
     *
     * @param  the channel type
     */
    class ChannelListenerHandler & CloseListenerSettable> implements WriteReadyHandler {
        private final C channel;

        /**
         * Construct a new instance.
         *
         * @param channel the channel
         */
        public ChannelListenerHandler(final C channel) {
            this.channel = channel;
        }

        public void forceTermination() {
            IoUtils.safeClose(channel);
        }

        public void writeReady() {
            final ChannelListener writeListener = channel.getWriteListener();
            if (writeListener == null) {
                channel.suspendWrites();
            } else {
                ChannelListeners.invokeChannelListener(channel, writeListener);
            }
        }

        public void terminated() {
            ChannelListeners.invokeChannelListener(channel, channel.getCloseListener());
        }
    }

    /**
     * A runnable task which invokes the {@link WriteReadyHandler#writeReady()} method of the given handler.
     */
    class ReadyTask implements Runnable {

        private final WriteReadyHandler handler;

        /**
         * Construct a new instance.
         *
         * @param handler the handler to invoke
         */
        public ReadyTask(final WriteReadyHandler handler) {
            this.handler = handler;
        }

        public void run() {
            handler.writeReady();
        }
    }
}