| /* |
| * 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.geode.test.junit.rules.gfsh.internal; |
| |
| import static java.util.concurrent.Executors.newSingleThreadExecutor; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.UncheckedIOException; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| import java.util.function.Consumer; |
| |
| class StreamGobbler implements AutoCloseable { |
| private final InputStream inputStream; |
| private final Consumer<String> consumeInputLine; |
| private final ExecutorService executorService; |
| |
| private Future<?> processInputTask; |
| |
| StreamGobbler(InputStream inputStream, Consumer<String> consumeInputLine) { |
| this.inputStream = inputStream; |
| this.consumeInputLine = consumeInputLine; |
| |
| executorService = newSingleThreadExecutor(); |
| } |
| |
| public void start() { |
| processInputTask = executorService.submit(this::processInputStream); |
| } |
| |
| @Override |
| public void close() { |
| executorService.shutdown(); |
| } |
| |
| /** |
| * Blocks until the StreamGobbler finishes processing the input stream |
| * |
| * @throws InterruptedException if the StreamGobbler thread was interrupted |
| * @throws ExecutionException if the StreamGobbler thread threw an exception |
| * @throws TimeoutException if the StreamGobbler does not finish processing input before the |
| * timeout |
| */ |
| public void awaitTermination(long timeout, TimeUnit unit) |
| throws InterruptedException, ExecutionException, TimeoutException { |
| if (processInputTask != null) { |
| processInputTask.get(timeout, unit); |
| } |
| } |
| |
| private void processInputStream() { |
| try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))) { |
| bufferedReader.lines().forEach(consumeInputLine); |
| } catch (UncheckedIOException | IOException ignored) { |
| // If this gobbler is reading the System.out stream from a process that gets killed, |
| // we will occasionally see an exception here than can be ignored. |
| } |
| } |
| } |