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Redis based In-Memory Data Grid for Java
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/**
 * Copyright 2018 Nikita Koksharov
 *
 * 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.redisson;

import java.util.Arrays;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;

import org.redisson.api.RFuture;
import org.redisson.api.RLock;
import org.redisson.client.codec.LongCodec;
import org.redisson.client.codec.StringCodec;
import org.redisson.client.protocol.RedisCommands;
import org.redisson.client.protocol.RedisStrictCommand;
import org.redisson.command.CommandAsyncExecutor;
import org.redisson.pubsub.LockPubSub;

import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;

/**
 * Lock will be removed automatically if client disconnects.
 *
 * @author Nikita Koksharov
 *
 */
public class RedissonWriteLock extends RedissonLock implements RLock {

    protected RedissonWriteLock(CommandAsyncExecutor commandExecutor, String name) {
        super(commandExecutor, name);
    }

    @Override
    String getChannelName() {
        return prefixName("redisson_rwlock", getName());
    }

    @Override
    String getLockName(long threadId) {
        return super.getLockName(threadId) + ":write";
    }
    
    @Override
     RFuture tryLockInnerAsync(long leaseTime, TimeUnit unit, long threadId, RedisStrictCommand command) {
        internalLockLeaseTime = unit.toMillis(leaseTime);

        return commandExecutor.evalWriteAsync(getName(), LongCodec.INSTANCE, command,
                            "local mode = redis.call('hget', KEYS[1], 'mode'); " +
                            "if (mode == false) then " +
                                  "redis.call('hset', KEYS[1], 'mode', 'write'); " +
                                  "redis.call('hset', KEYS[1], ARGV[2], 1); " +
                                  "redis.call('pexpire', KEYS[1], ARGV[1]); " +
                                  "return nil; " +
                              "end; " +
                              "if (mode == 'write') then " +
                                  "if (redis.call('hexists', KEYS[1], ARGV[2]) == 1) then " +
                                      "redis.call('hincrby', KEYS[1], ARGV[2], 1); " + 
                                      "local currentExpire = redis.call('pttl', KEYS[1]); " +
                                      "redis.call('pexpire', KEYS[1], currentExpire + ARGV[1]); " +
                                      "return nil; " +
                                  "end; " +
                                "end;" +
                                "return redis.call('pttl', KEYS[1]);",
                        Arrays.