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    • com.lambdaworks.redis.RedisAsyncConnection Maven / Gradle / Ivy

    // Copyright (C) 2011 - Will Glozer.  All rights reserved.

package com.lambdaworks.redis;

import com.lambdaworks.redis.codec.RedisCodec;
import com.lambdaworks.redis.protocol.*;

import java.util.ArrayList;
import java.util.List;

/**
 * An asynchronous {@link RedisConnection} wrapper. All redis command methods
 * with the exception of {@link #multi}, {@link #exec} and {@link #discard} will
 * immediately return null and their output can be collected later via the
 * {@link #flush} method.
 *
 * RedisAsyncConnections are not thread-safe and should only be used by a
 * single thread.
 *
 * @author Will Glozer
 */
public class RedisAsyncConnection extends RedisConnection {
    private RedisConnection parent;
    private List> pipeline;

    /**
     * Initialize a new connection.
     *
     * @param codec     Codec used to encode/decode keys and values.
     * @param parent    Parent connection.
     */
    public RedisAsyncConnection(RedisCodec codec, RedisConnection parent) {
        super(null, codec, 0, null);
        this.parent   = parent;
        this.pipeline = new ArrayList>();
    }

    /**
     * Wait for completion of all commands executed since the last flush
     * and return their outputs.
     *
     * @return The command outputs.
     */
    public List flush() {
        List list = new ArrayList(pipeline.size());
        for (Command cmd : pipeline) {
            list.add(parent.getOutput(cmd));
        }
        pipeline.clear();
        return list;
    }

    @Override
    public String discard() {
        return parent.discard();
    }

    @Override
    public List exec() {
        return parent.exec();
    }

    @Override
    public String multi() {
        return parent.multi();
    }

    @Override
    public  Command dispatch(CommandType type, CommandOutput output, CommandArgs args) {
        Command cmd = parent.dispatch(type, output, args);
        pipeline.add(cmd);
        return cmd;
    }

    @Override
    public  T getOutput(Command cmd) {
        return null;
    }
}
    
    
    
    

    




    
    
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