author | simonis |
Fri, 14 Aug 2015 10:35:45 +0200 | |
changeset 32209 | 24bb680a1609 |
parent 31539 | f850b9d09c91 |
child 44269 | 762b2df849b3 |
permissions | -rw-r--r-- |
30899 | 1 |
/* |
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* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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||
24 |
import com.sun.management.OperatingSystemMXBean; |
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import java.io.File; |
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import java.io.InputStream; |
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import java.io.OutputStream; |
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import java.io.InputStreamReader; |
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import java.io.BufferedReader; |
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import java.io.IOException; |
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import java.io.PrintStream; |
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import java.io.Reader; |
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import java.io.PrintWriter; |
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import java.lang.InterruptedException; |
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import java.lang.Override; |
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import java.lang.management.ManagementFactory; |
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import java.time.Instant; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collections; |
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41 |
import java.util.concurrent.CompletableFuture; |
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import java.util.HashSet; |
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import java.util.List; |
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import java.util.Set; |
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import java.util.function.Consumer; |
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46 |
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47 |
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48 |
/** |
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* Command driven subprocess with useful child functions. |
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*/ |
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public class JavaChild extends Process { |
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52 |
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53 |
private static volatile int commandSeq = 0; // Command sequence number |
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54 |
private static final ProcessHandle self = ProcessHandle.current(); |
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private static int finalStatus = 0; |
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56 |
private static final List<JavaChild> children = new ArrayList<>(); |
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57 |
private static final Set<JavaChild> completedChildren = |
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Collections.synchronizedSet(new HashSet<>()); |
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59 |
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60 |
private final Process delegate; |
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private final PrintWriter inputWriter; |
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private final BufferedReader outputReader; |
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64 |
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65 |
/** |
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* Create a JavaChild control instance that delegates to the spawned process. |
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* {@link #sendAction} is used to send commands via the processes stdin. |
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* {@link #forEachOutputLine} can be used to process output from the child |
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* @param delegate the process to delegate and send commands to and get responses from |
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*/ |
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private JavaChild(ProcessBuilder pb) throws IOException { |
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allArgs = pb.command(); |
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delegate = pb.start(); |
30899 | 74 |
// Initialize PrintWriter with autoflush (on println) |
75 |
inputWriter = new PrintWriter(delegate.getOutputStream(), true); |
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outputReader = new BufferedReader(new InputStreamReader(delegate.getInputStream())); |
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77 |
} |
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78 |
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79 |
@Override |
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80 |
public void destroy() { |
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81 |
delegate.destroy(); |
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82 |
} |
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83 |
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84 |
@Override |
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85 |
public int exitValue() { |
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86 |
return delegate.exitValue(); |
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87 |
} |
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88 |
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89 |
@Override |
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90 |
public int waitFor() throws InterruptedException { |
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return delegate.waitFor(); |
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} |
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93 |
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94 |
@Override |
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public OutputStream getOutputStream() { |
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return delegate.getOutputStream(); |
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} |
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@Override |
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public InputStream getInputStream() { |
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return delegate.getInputStream(); |
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} |
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103 |
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104 |
@Override |
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105 |
public InputStream getErrorStream() { |
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return delegate.getErrorStream(); |
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} |
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108 |
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109 |
@Override |
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110 |
public ProcessHandle toHandle() { |
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return delegate.toHandle(); |
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} |
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113 |
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114 |
@Override |
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115 |
public CompletableFuture<Process> onExit() { |
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return delegate.onExit(); |
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} |
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118 |
@Override |
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119 |
public String toString() { |
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return "delegate: " + delegate.toString(); |
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} |
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public List<String> getArgs() { |
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return allArgs; |
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} |
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30899 | 127 |
public CompletableFuture<JavaChild> onJavaChildExit() { |
128 |
return onExit().thenApply(ph -> this); |
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} |
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130 |
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131 |
/** |
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132 |
* Send an action and arguments to the child via stdin. |
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* @param action the action |
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* @param args additional arguments |
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135 |
* @throws IOException if something goes wrong writing to the child |
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*/ |
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137 |
void sendAction(String action, Object... args) throws IOException { |
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138 |
StringBuilder sb = new StringBuilder(); |
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sb.append(action); |
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for (Object arg :args) { |
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sb.append(" "); |
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sb.append(arg); |
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} |
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String cmd = sb.toString(); |
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synchronized (this) { |
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inputWriter.println(cmd); |
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} |
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} |
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149 |
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150 |
public BufferedReader outputReader() { |
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151 |
return outputReader; |
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} |
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153 |
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154 |
/** |
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155 |
* Asynchronously evaluate each line of output received back from the child process. |
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* @param consumer a Consumer of each line read from the child |
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* @return a CompletableFuture that is completed when the child closes System.out. |
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*/ |
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159 |
CompletableFuture<String> forEachOutputLine(Consumer<String> consumer) { |
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160 |
final CompletableFuture<String> future = new CompletableFuture<>(); |
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String name = "OutputLineReader-" + getPid(); |
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162 |
Thread t = new Thread(() -> { |
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try (BufferedReader reader = outputReader()) { |
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164 |
String line; |
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165 |
while ((line = reader.readLine()) != null) { |
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166 |
consumer.accept(line); |
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} |
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} catch (IOException | RuntimeException ex) { |
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consumer.accept("IOE (" + getPid() + "):" + ex.getMessage()); |
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future.completeExceptionally(ex); |
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} |
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future.complete("success"); |
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173 |
}, name); |
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t.start(); |
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return future; |
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} |
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178 |
/** |
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* Spawn a JavaChild with the provided arguments. |
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* Commands can be send to the child with {@link #sendAction}. |
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* Output lines from the child can be processed with {@link #forEachOutputLine}. |
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* System.err is set to inherit and is the unstructured async logging |
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* output for all subprocesses. |
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* @param args the command line arguments to JavaChild |
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* @return the JavaChild that was started |
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* @throws IOException thrown by ProcessBuilder.start |
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*/ |
|
188 |
static JavaChild spawnJavaChild(Object... args) throws IOException { |
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String[] stringArgs = new String[args.length]; |
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190 |
for (int i = 0; i < args.length; i++) { |
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191 |
stringArgs[i] = args[i].toString(); |
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192 |
} |
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ProcessBuilder pb = build(stringArgs); |
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pb.redirectError(ProcessBuilder.Redirect.INHERIT); |
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return new JavaChild(pb); |
30899 | 196 |
} |
197 |
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198 |
/** |
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199 |
* Spawn a JavaChild with the provided arguments. |
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200 |
* Sets the process to inherit the I/O channels. |
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* @param args the command line arguments to JavaChild |
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* @return the Process that was started |
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203 |
* @throws IOException thrown by ProcessBuilder.start |
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204 |
*/ |
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205 |
static Process spawn(String... args) throws IOException { |
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206 |
ProcessBuilder pb = build(args); |
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207 |
pb.inheritIO(); |
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return pb.start(); |
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209 |
} |
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210 |
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211 |
/** |
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212 |
* Return a ProcessBuilder with the javaChildArgs and |
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213 |
* any additional supplied args. |
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214 |
* |
|
215 |
* @param args the command line arguments to JavaChild |
|
216 |
* @return the ProcessBuilder |
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217 |
*/ |
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218 |
static ProcessBuilder build(String ... args) { |
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219 |
ProcessBuilder pb = new ProcessBuilder(); |
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220 |
List<String> list = new ArrayList<>(javaChildArgs); |
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for (String arg : args) |
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222 |
list.add(arg); |
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223 |
pb.command(list); |
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224 |
return pb; |
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225 |
} |
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226 |
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227 |
static final String javaHome = (System.getProperty("test.jdk") != null) |
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228 |
? System.getProperty("test.jdk") |
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229 |
: System.getProperty("java.home"); |
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230 |
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231 |
static final String javaExe = |
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232 |
javaHome + File.separator + "bin" + File.separator + "java"; |
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233 |
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234 |
static final String classpath = |
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235 |
System.getProperty("java.class.path"); |
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236 |
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237 |
static final List<String> javaChildArgs = |
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238 |
Arrays.asList(javaExe, |
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239 |
"-XX:+DisplayVMOutputToStderr", |
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240 |
"-Dtest.jdk=" + javaHome, |
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241 |
"-classpath", absolutifyPath(classpath), |
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242 |
"JavaChild"); |
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243 |
||
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31539
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244 |
// Will hold the complete list of arguments which was given to Processbuilder.command() |
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245 |
private List<String> allArgs; |
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|
246 |
|
30899 | 247 |
private static String absolutifyPath(String path) { |
248 |
StringBuilder sb = new StringBuilder(); |
|
249 |
for (String file : path.split(File.pathSeparator)) { |
|
250 |
if (sb.length() != 0) |
|
251 |
sb.append(File.pathSeparator); |
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252 |
sb.append(new File(file).getAbsolutePath()); |
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253 |
} |
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254 |
return sb.toString(); |
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255 |
} |
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256 |
||
257 |
/** |
|
258 |
* Main program that interprets commands from the command line args or stdin. |
|
259 |
* Each command produces output to stdout confirming the command and |
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260 |
* providing results. |
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261 |
* System.err is used for unstructured information. |
|
262 |
* @param args an array of strings to be interpreted as commands; |
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263 |
* each command uses additional arguments as needed |
|
264 |
*/ |
|
265 |
public static void main(String[] args) { |
|
266 |
System.out.printf("args: %s %s%n", ProcessHandle.current(), Arrays.toString(args)); |
|
267 |
interpretCommands(args); |
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268 |
System.exit(finalStatus); |
|
269 |
} |
|
270 |
||
271 |
/** |
|
272 |
* Interpret an array of strings as a command line. |
|
273 |
* @param args an array of strings to be interpreted as commands; |
|
274 |
* each command uses additional arguments as needed |
|
275 |
*/ |
|
276 |
private static void interpretCommands(String[] args) { |
|
277 |
try { |
|
278 |
int nextArg = 0; |
|
279 |
while (nextArg < args.length) { |
|
280 |
String action = args[nextArg++]; |
|
281 |
switch (action) { |
|
282 |
case "help": |
|
283 |
sendResult(action, ""); |
|
284 |
help(); |
|
285 |
break; |
|
286 |
case "sleep": |
|
287 |
int millis = Integer.valueOf(args[nextArg++]); |
|
288 |
Thread.sleep(millis); |
|
289 |
sendResult(action, Integer.toString(millis)); |
|
290 |
break; |
|
291 |
case "cpuloop": |
|
31539
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292 |
long cpuMillis = Long.valueOf(args[nextArg++]); |
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293 |
long cpuTarget = getCpuTime() + cpuMillis * 1_000_000L; |
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|
294 |
while (getCpuTime() < cpuTarget) { |
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|
295 |
// burn the cpu until the time is up |
30899 | 296 |
} |
31539
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|
297 |
sendResult(action, cpuMillis); |
30899 | 298 |
break; |
299 |
case "cputime": |
|
300 |
sendResult(action, getCpuTime()); |
|
301 |
break; |
|
302 |
case "out": |
|
303 |
case "err": |
|
304 |
String value = args[nextArg++]; |
|
305 |
sendResult(action, value); |
|
306 |
if (action.equals("err")) { |
|
307 |
System.err.println(value); |
|
308 |
} |
|
309 |
break; |
|
310 |
case "stdin": |
|
311 |
// Read commands from stdin; at eof, close stdin of |
|
312 |
// children and wait for each to exit |
|
313 |
sendResult(action, "start"); |
|
314 |
try (Reader reader = new InputStreamReader(System.in); |
|
315 |
BufferedReader input = new BufferedReader(reader)) { |
|
316 |
String line; |
|
317 |
while ((line = input.readLine()) != null) { |
|
318 |
line = line.trim(); |
|
319 |
if (!line.isEmpty()) { |
|
320 |
String[] split = line.split("\\s"); |
|
321 |
interpretCommands(split); |
|
322 |
} |
|
323 |
} |
|
324 |
// EOF on stdin, close stdin on all spawned processes |
|
325 |
for (JavaChild p : children) { |
|
326 |
try { |
|
327 |
p.getOutputStream().close(); |
|
328 |
} catch (IOException ie) { |
|
329 |
sendResult("stdin_closing", p.getPid(), |
|
330 |
"exception", ie.getMessage()); |
|
331 |
} |
|
332 |
} |
|
333 |
||
334 |
for (JavaChild p : children) { |
|
335 |
do { |
|
336 |
try { |
|
337 |
p.waitFor(); |
|
338 |
break; |
|
339 |
} catch (InterruptedException e) { |
|
340 |
// retry |
|
341 |
} |
|
342 |
} while (true); |
|
343 |
} |
|
344 |
// Wait for all children to be gone |
|
345 |
Instant timeOut = Instant.now().plusSeconds(10L); |
|
346 |
while (!completedChildren.containsAll(children)) { |
|
347 |
if (Instant.now().isBefore(timeOut)) { |
|
348 |
Thread.sleep(100L); |
|
349 |
} else { |
|
350 |
System.err.printf("Timeout waiting for " + |
|
351 |
"children to terminate%n"); |
|
352 |
children.removeAll(completedChildren); |
|
353 |
for (JavaChild c : children) { |
|
354 |
sendResult("stdin_noterm", c.getPid()); |
|
355 |
System.err.printf(" Process not terminated: " + |
|
356 |
"pid: %d%n", c.getPid()); |
|
357 |
} |
|
358 |
System.exit(2); |
|
359 |
} |
|
360 |
} |
|
361 |
} |
|
362 |
sendResult(action, "done"); |
|
363 |
return; // normal exit from JavaChild Process |
|
364 |
case "parent": |
|
365 |
sendResult(action, self.parent().toString()); |
|
366 |
break; |
|
367 |
case "pid": |
|
368 |
sendResult(action, self.toString()); |
|
369 |
break; |
|
370 |
case "exit": |
|
371 |
int exitValue = (nextArg < args.length) |
|
372 |
? Integer.valueOf(args[nextArg]) : 0; |
|
373 |
sendResult(action, exitValue); |
|
374 |
System.exit(exitValue); |
|
375 |
break; |
|
376 |
case "spawn": { |
|
377 |
if (args.length - nextArg < 2) { |
|
378 |
throw new RuntimeException("not enough args for respawn: " + |
|
379 |
(args.length - 2)); |
|
380 |
} |
|
381 |
// Spawn as many children as requested and |
|
382 |
// pass on rest of the arguments |
|
383 |
int ncount = Integer.valueOf(args[nextArg++]); |
|
384 |
Object[] subargs = new String[args.length - nextArg]; |
|
385 |
System.arraycopy(args, nextArg, subargs, 0, subargs.length); |
|
386 |
for (int i = 0; i < ncount; i++) { |
|
387 |
JavaChild p = spawnJavaChild(subargs); |
|
388 |
sendResult(action, p.getPid()); |
|
389 |
p.forEachOutputLine(JavaChild::sendRaw); |
|
390 |
p.onJavaChildExit().thenAccept((p1) -> { |
|
391 |
int excode = p1.exitValue(); |
|
392 |
sendResult("child_exit", p1.getPid(), excode); |
|
393 |
completedChildren.add(p1); |
|
394 |
}); |
|
395 |
children.add(p); // Add child to spawned list |
|
396 |
} |
|
397 |
nextArg = args.length; |
|
398 |
break; |
|
399 |
} |
|
400 |
case "child": { |
|
401 |
// Send the command to all the live children; |
|
402 |
// ignoring those that are not alive |
|
403 |
int sentCount = 0; |
|
404 |
Object[] result = |
|
405 |
Arrays.copyOfRange(args, nextArg - 1, args.length); |
|
406 |
Object[] subargs = |
|
407 |
Arrays.copyOfRange(args, nextArg + 1, args.length); |
|
408 |
for (JavaChild p : children) { |
|
409 |
if (p.isAlive()) { |
|
410 |
sentCount++; |
|
411 |
// overwrite with current pid |
|
412 |
result[0] = Long.toString(p.getPid()); |
|
413 |
sendResult(action, result); |
|
414 |
p.sendAction(args[nextArg], subargs); |
|
415 |
} |
|
416 |
} |
|
417 |
if (sentCount == 0) { |
|
418 |
sendResult(action, "n/a"); |
|
419 |
} |
|
420 |
nextArg = args.length; |
|
421 |
break; |
|
422 |
} |
|
423 |
case "child_eof" : |
|
424 |
// Close the InputStream of all the live children; |
|
425 |
// ignoring those that are not alive |
|
426 |
for (JavaChild p : children) { |
|
427 |
if (p.isAlive()) { |
|
428 |
sendResult(action, p.getPid()); |
|
429 |
p.getOutputStream().close(); |
|
430 |
} |
|
431 |
} |
|
432 |
break; |
|
433 |
case "property": |
|
434 |
String name = args[nextArg++]; |
|
435 |
sendResult(action, name, System.getProperty(name)); |
|
436 |
break; |
|
437 |
case "threaddump": |
|
438 |
Thread.dumpStack(); |
|
439 |
break; |
|
440 |
default: |
|
441 |
throw new Error("JavaChild action unknown: " + action); |
|
442 |
} |
|
443 |
} |
|
444 |
} catch (Throwable t) { |
|
445 |
t.printStackTrace(System.err); |
|
446 |
System.exit(1); |
|
447 |
} |
|
448 |
} |
|
449 |
||
450 |
static synchronized void sendRaw(String s) { |
|
451 |
System.out.println(s); |
|
452 |
System.out.flush(); |
|
453 |
} |
|
454 |
static void sendResult(String action, Object... results) { |
|
455 |
sendRaw(new Event(action, results).toString()); |
|
456 |
} |
|
457 |
||
458 |
static long getCpuTime() { |
|
459 |
OperatingSystemMXBean osMbean = |
|
460 |
(OperatingSystemMXBean)ManagementFactory.getOperatingSystemMXBean(); |
|
461 |
return osMbean.getProcessCpuTime(); |
|
462 |
} |
|
463 |
||
464 |
/** |
|
465 |
* Print command usage to stderr. |
|
466 |
*/ |
|
467 |
private static void help() { |
|
468 |
System.err.println("Commands:"); |
|
469 |
System.err.println(" help"); |
|
470 |
System.err.println(" pid"); |
|
471 |
System.err.println(" parent"); |
|
472 |
System.err.println(" cpuloop <loopcount>"); |
|
473 |
System.err.println(" cputime"); |
|
474 |
System.err.println(" stdin - read commands from stdin"); |
|
475 |
System.err.println(" sleep <millis>"); |
|
476 |
System.err.println(" spawn <n> command... - spawn n new children and send command"); |
|
477 |
System.err.println(" child command... - send command to all live children"); |
|
478 |
System.err.println(" child_eof - send eof to all live children"); |
|
479 |
System.err.println(" exit <exitcode>"); |
|
480 |
System.err.println(" out arg..."); |
|
481 |
System.err.println(" err arg..."); |
|
482 |
} |
|
483 |
||
484 |
static class Event { |
|
485 |
long pid; |
|
486 |
long seq; |
|
487 |
String command; |
|
488 |
Object[] results; |
|
489 |
Event(String command, Object... results) { |
|
490 |
this(self.getPid(), ++commandSeq, command, results); |
|
491 |
} |
|
492 |
Event(long pid, int seq, String command, Object... results) { |
|
493 |
this.pid = pid; |
|
494 |
this.seq = seq; |
|
495 |
this.command = command; |
|
496 |
this.results = results; |
|
497 |
} |
|
498 |
||
499 |
/** |
|
500 |
* Create a String encoding the pid, seq, command, and results. |
|
501 |
* |
|
502 |
* @return a String formatted to send to the stream. |
|
503 |
*/ |
|
504 |
String format() { |
|
505 |
StringBuilder sb = new StringBuilder(); |
|
506 |
sb.append(pid); |
|
507 |
sb.append(":"); |
|
508 |
sb.append(seq); |
|
509 |
sb.append(" "); |
|
510 |
sb.append(command); |
|
511 |
for (int i = 0; i < results.length; i++) { |
|
512 |
sb.append(" "); |
|
513 |
sb.append(results[i]); |
|
514 |
} |
|
515 |
return sb.toString(); |
|
516 |
} |
|
517 |
||
518 |
Event(String encoded) { |
|
519 |
String[] split = encoded.split("\\s"); |
|
520 |
String[] pidSeq = split[0].split(":"); |
|
521 |
pid = Long.valueOf(pidSeq[0]); |
|
522 |
seq = Integer.valueOf(pidSeq[1]); |
|
523 |
command = split[1]; |
|
524 |
Arrays.copyOfRange(split, 1, split.length); |
|
525 |
} |
|
526 |
||
527 |
public String toString() { |
|
528 |
return format(); |
|
529 |
} |
|
530 |
||
531 |
} |
|
532 |
} |