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From GJL <...@git.apache.org>
Subject [GitHub] flink pull request #5312: [FLINK-8344][WIP] Add support for HA to RestCluste...
Date Mon, 22 Jan 2018 10:11:57 GMT
Github user GJL commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5312#discussion_r162893190
  
    --- Diff: flink-clients/src/main/java/org/apache/flink/client/program/rest/LeaderHolder.java
---
    @@ -0,0 +1,74 @@
    +/*
    + * 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.client.program.rest;
    +
    +import javax.annotation.Nullable;
    +
    +import static org.apache.flink.util.Preconditions.checkArgument;
    +
    +class LeaderHolder<T> {
    +
    +	private final String leaderType;
    +
    +	private final long awaitLeaderTimeoutMs;
    +
    +	private volatile T leaderAddress;
    +
    +	LeaderHolder(final String leaderType, final long awaitLeaderTimeoutMs) {
    +		checkArgument(awaitLeaderTimeoutMs >= 0, "awaitLeaderTimeoutMs must be greater than
or equal to 0");
    +		this.leaderType = leaderType;
    +		this.awaitLeaderTimeoutMs = awaitLeaderTimeoutMs;
    +	}
    +
    +	public T getLeaderAddress() throws LeaderNotAvailableException {
    +		final long startTime = System.nanoTime();
    +		T result;
    +		synchronized (this) {
    +			long sleptTimeMs = 0;
    +			while (leaderAddress == null && sleptTimeMs < awaitLeaderTimeoutMs) {
    +				try {
    +					wait(awaitLeaderTimeoutMs - sleptTimeMs);
    +				} catch (InterruptedException e) {
    +					Thread.currentThread().interrupt();
    +				}
    +				sleptTimeMs = (System.nanoTime() - startTime) / 1000000;
    --- End diff --
    
    That's better but I am going to remove this class and use `LeaderRetriever` instead.


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