[GitHub] flink pull request #6021: [FLINK-9374] [kinesis] Enable FlinkKinesisProducer...

[bowenli86 <gi...@git.apache.org>]

Github user bowenli86 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6021#discussion_r192834879
  
    --- Diff: flink-connectors/flink-connector-kinesis/src/main/java/org/apache/flink/streaming/connectors/kinesis/util/TimeoutLatch.java ---
    @@ -0,0 +1,41 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you 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.apache.flink.streaming.connectors.kinesis.util;
    +
    +public class TimeoutLatch {
    +
    +	private final Object lock = new Object();
    +	private volatile boolean waiting;
    +
    +	public void await(long timeout) throws InterruptedException {
    +		synchronized (lock) {
    +			waiting = true;
    +			lock.wait(timeout);
    +		}
    +	}
    +
    +	public void trigger() {
    +		if (waiting) {
    +			synchronized (lock) {
    +				waiting = false;
    --- End diff --
    
    needs another `if (waiting)` here inside the synchronized block, to ensure no one chimes in between line 34 and 35


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