io.horizondb.client.DefaultMsgChannel.java Source code

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Here is the source code for io.horizondb.client.DefaultMsgChannel.java

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/**
 * 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 io.horizondb.client;

import io.horizondb.model.protocol.ErrorPayload;
import io.horizondb.model.protocol.Msg;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;

/**
 * Handle the sending and retrieval of messages.
 * 
 * @author Benjamin
 *
 */
class DefaultMsgChannel implements MsgChannel {

    /**
     * The channel.
     */
    private final Channel channel;

    /**
     * The queue used to store the response messages.
     */
    private final BlockingQueue<Msg<?>> queue;

    /**
     * The query timeout in second.
     */
    private final int queryTimeoutInSecond;

    /**
     * @param channel 
     * 
     */
    public DefaultMsgChannel(Channel channel, int queryTimeoutInSecond) {

        this.channel = channel;
        this.queryTimeoutInSecond = queryTimeoutInSecond;
        this.queue = ((ClientHandler) this.channel.pipeline().last()).getQueue();
    }

    /**
      * {@inheritDoc}
      */
    @Override
    public void sendRequest(Msg<?> request) {

        this.queue.clear();

        ChannelFuture future = this.channel.writeAndFlush(request);
        future.awaitUninterruptibly();

        if (!future.isSuccess()) {

            throw new HorizonDBException("", future.cause());
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Msg<?> awaitResponse() {

        return awaitResponse(this.queryTimeoutInSecond);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Msg<?> awaitResponse(int timeoutInSeconds) {
        try {

            Msg<?> response = this.queue.poll(timeoutInSeconds, TimeUnit.SECONDS);

            if (response == null) {

                throw new QueryTimeoutException(
                        "No response has been received for more than " + timeoutInSeconds + " seconds.");
            }

            if (!response.getHeader().isSuccess()) {

                throw new HorizonDBException((ErrorPayload) response.getPayload());
            }

            return response;

        } catch (InterruptedException e) {

            Thread.currentThread().interrupt();
            throw new HorizonDBException("", e);
        }
    }

    /**
      * {@inheritDoc}
      */
    @Override
    public void close() {

        this.channel.disconnect();
    }
}