Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2016 Alibaba Group * * 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 com.android.ide.common.process; import com.android.annotations.NonNull; import com.android.annotations.Nullable; import com.android.utils.ILogger; import com.google.common.base.Joiner; import com.google.common.collect.Lists; import com.google.common.io.ByteStreams; import com.google.common.util.concurrent.FutureCallback; import com.google.common.util.concurrent.Futures; import com.google.common.util.concurrent.ListenableFuture; import com.google.common.util.concurrent.SettableFuture; import org.apache.commons.lang.StringUtils; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.List; import java.util.Map; import java.util.concurrent.atomic.AtomicReference; /** * Created by wuzhong on 2017/2/16. */ public class MtlProcessExecutor extends DefaultProcessExecutor { private ILogger mLogger; public MtlProcessExecutor(ILogger logger) { super(logger); this.mLogger = logger; } public ListenableFuture<ProcessResult> submit(@NonNull ProcessInfo processInfo, @NonNull final ProcessOutputHandler processOutputHandler) { final List<String> command = buildCommand(processInfo); mLogger.info("command: " + Joiner.on(' ').join(command)); final SettableFuture<ProcessResult> result = SettableFuture.create(); try { // Launch the command line process. ProcessBuilder processBuilder = new ProcessBuilder(buildCommand(processInfo)); Map<String, Object> envVariableMap = processInfo.getEnvironment(); if (!envVariableMap.isEmpty()) { Map<String, String> env = processBuilder.environment(); for (Map.Entry<String, Object> entry : envVariableMap.entrySet()) { env.put(entry.getKey(), entry.getValue().toString()); } } else { Map<String, String> env = processBuilder.environment(); env.putAll(System.getenv()); } if (processInfo instanceof MtlProcessInfo) { MtlProcessInfo mtlProcessInfo = (MtlProcessInfo) processInfo; if (StringUtils.isNotEmpty(mtlProcessInfo.getWorkspace())) { processBuilder.directory(new File(mtlProcessInfo.getWorkspace())); } } // Start the process. Process process = processBuilder.start(); // Grab the output, and the exit code. final ProcessOutput output = processOutputHandler.createOutput(); ListenableFuture<Integer> outputFuture = grabProcessOutput(process, output); Futures.addCallback(outputFuture, new FutureCallback<Integer>() { @Override public void onSuccess(Integer exit) { try { output.close(); processOutputHandler.handleOutput(output); result.set(new ProcessResultImpl(command, exit)); } catch (Exception e) { result.set(new ProcessResultImpl(command, e)); } } @Override public void onFailure(@Nullable Throwable t) { result.set(new ProcessResultImpl(command, t)); } }); } catch (Exception e) { result.set(new ProcessResultImpl(command, e)); } return result; } private static ListenableFuture<Integer> grabProcessOutput(@NonNull final Process process, @NonNull final ProcessOutput output) { final SettableFuture<Integer> result = SettableFuture.create(); final AtomicReference<Exception> exceptionHolder = new AtomicReference<Exception>(); /* * It looks like on windows process#waitFor() can return before the thread have filled the * arrays, so we wait for both threads and the process itself. * * To make sure everything is complete before setting the future, the thread handling * "out" will wait for all its input to be read, will wait for the "err" thread to finish * and will wait for the process to finish. Only after all three are done will it set * the future and terminate. * * This means that the future will be set while the "out" thread is still running, but * no output is pending and the process has already finished. */ final Thread threadErr = new Thread("stderr") { @Override public void run() { InputStream stderr = process.getErrorStream(); OutputStream stream = output.getErrorOutput(); try { ByteStreams.copy(stderr, stream); stream.flush(); } catch (IOException e) { exceptionHolder.compareAndSet(null, e); } } }; Thread threadOut = new Thread("stdout") { @Override public void run() { InputStream stdout = process.getInputStream(); OutputStream stream = output.getStandardOutput(); try { ByteStreams.copy(stdout, stream); stream.flush(); } catch (Exception e) { exceptionHolder.compareAndSet(null, e); } try { threadErr.join(); int processResult = process.waitFor(); if (exceptionHolder.get() != null) { result.setException(exceptionHolder.get()); } result.set(processResult); output.close(); } catch (Exception e) { result.setException(e); } } }; threadErr.start(); threadOut.start(); return result; } private static List<String> buildCommand(@NonNull ProcessInfo processInfo) { List<String> command = Lists.newArrayList(); command.add(processInfo.getExecutable()); command.addAll(processInfo.getArgs()); return command; } }