| /* |
| * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.io.File; |
| import java.io.FileReader; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.Reader; |
| import java.io.Writer; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| /* |
| * @test PipelineTest |
| */ |
| |
| public class PipelineTest { |
| |
| private static void realMain(String[] args) throws Throwable { |
| t1_simplePipeline(); |
| t2_translatePipeline(); |
| t3_redirectErrorStream(); |
| t4_failStartPipeline(); |
| } |
| |
| /** |
| * Return a list of the varargs arguments. |
| * @param args elements to include in the list |
| * @param <T> the type of the elements |
| * @return a {@code List<T>} of the arguments |
| */ |
| @SafeVarargs |
| @SuppressWarnings("varargs") |
| static <T> List<T> asList(T... args) { |
| return Arrays.asList(args); |
| } |
| |
| /** |
| * T1 - simple copy between two processes |
| */ |
| static void t1_simplePipeline() { |
| try { |
| String s1 = "Now is the time to check!"; |
| verify(s1, s1, |
| asList(new ProcessBuilder("cat"))); |
| verify(s1, s1, |
| asList(new ProcessBuilder("cat"), |
| new ProcessBuilder("cat"))); |
| verify(s1, s1, |
| asList(new ProcessBuilder("cat"), |
| new ProcessBuilder("cat"), |
| new ProcessBuilder("cat"))); |
| } catch (Throwable t) { |
| unexpected(t); |
| } |
| } |
| |
| /** |
| * Pipeline that modifies the content. |
| */ |
| static void t2_translatePipeline() { |
| try { |
| String s2 = "Now is the time to check!"; |
| String r2 = s2.replace('e', 'E').replace('o', 'O'); |
| verify(s2, r2, |
| asList(new ProcessBuilder("tr", "e", "E"), |
| new ProcessBuilder("tr", "o", "O"))); |
| } catch (Throwable t) { |
| unexpected(t); |
| } |
| } |
| |
| /** |
| * Test that redirectErrorStream sends standard error of the first process |
| * to the standard output. The standard error of the first process should be empty. |
| * The standard output of the 2nd should contain the error message including the bad file name. |
| */ |
| static void t3_redirectErrorStream() { |
| try { |
| File p1err = new File("p1-test.err"); |
| File p2out = new File("p2-test.out"); |
| |
| List<Process> processes = ProcessBuilder.startPipeline( |
| asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE") |
| .redirectErrorStream(true) |
| .redirectError(p1err), |
| new ProcessBuilder("cat").redirectOutput(p2out))); |
| waitForAll(processes); |
| |
| check("".equals(fileContents(p1err)), "The first process standard error should be empty"); |
| String p2contents = fileContents(p2out); |
| check(p2contents.contains("NON-EXISTENT-FILE"), |
| "The error from the first process should be in the output of the second: " + p2contents); |
| } catch (Throwable t) { |
| unexpected(t); |
| } |
| } |
| |
| /** |
| * Test that no processes are left after a failed startPipeline. |
| * Test illegal combinations of redirects. |
| */ |
| static void t4_failStartPipeline() { |
| File p1err = new File("p1-test.err"); |
| File p2out = new File("p2-test.out"); |
| |
| THROWS(IllegalArgumentException.class, |
| () -> { |
| // Test that output redirect != PIPE throws IAE |
| List<Process> processes = ProcessBuilder.startPipeline( |
| asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE1") |
| .redirectOutput(p1err), |
| new ProcessBuilder("cat"))); |
| }, |
| () -> { |
| // Test that input redirect != PIPE throws IAE |
| List<Process> processes = ProcessBuilder.startPipeline( |
| asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE2"), |
| new ProcessBuilder("cat").redirectInput(p2out))); |
| } |
| ); |
| |
| THROWS(NullPointerException.class, |
| () -> { |
| List<Process> processes = ProcessBuilder.startPipeline( |
| asList(new ProcessBuilder("cat", "a"), null)); |
| }, |
| () -> { |
| List<Process> processes = ProcessBuilder.startPipeline( |
| asList(null, new ProcessBuilder("cat", "b"))); |
| } |
| ); |
| |
| THROWS(IOException.class, |
| () -> { |
| List<Process> processes = ProcessBuilder.startPipeline( |
| asList(new ProcessBuilder("cat", "c"), |
| new ProcessBuilder("NON-EXISTENT-COMMAND"))); |
| }); |
| |
| // Check no subprocess are left behind |
| ProcessHandle.current().children().forEach(PipelineTest::print); |
| ProcessHandle.current().children() |
| .filter(p -> p.info().command().orElse("").contains("cat")) |
| .forEach(p -> fail("process should have been destroyed: " + p)); |
| } |
| |
| static void verify(String input, String expected, List<ProcessBuilder> builders) throws IOException { |
| File infile = new File("test.in"); |
| File outfile = new File("test.out"); |
| setFileContents(infile, expected); |
| for (int i = 0; i < builders.size(); i++) { |
| ProcessBuilder b = builders.get(i); |
| if (i == 0) { |
| b.redirectInput(infile); |
| } |
| if (i == builders.size() - 1) { |
| b.redirectOutput(outfile); |
| } |
| } |
| List<Process> processes = ProcessBuilder.startPipeline(builders); |
| verifyProcesses(processes); |
| waitForAll(processes); |
| String result = fileContents(outfile); |
| System.out.printf(" in: %s%nout: %s%n", input, expected); |
| check(result.equals(expected), "result not as expected"); |
| } |
| |
| /** |
| * Wait for each of the processes to be done. |
| * |
| * @param processes the list of processes to check |
| */ |
| static void waitForAll(List<Process> processes) { |
| processes.forEach(p -> { |
| try { |
| int status = p.waitFor(); |
| } catch (InterruptedException ie) { |
| unexpected(ie); |
| } |
| }); |
| } |
| |
| static void print(ProcessBuilder pb) { |
| if (pb != null) { |
| System.out.printf(" pb: %s%n", pb); |
| System.out.printf(" cmd: %s%n", pb.command()); |
| } |
| } |
| |
| static void print(ProcessHandle p) { |
| System.out.printf("process: pid: %d, info: %s%n", |
| p.pid(), p.info()); |
| } |
| |
| // Check various aspects of the processes |
| static void verifyProcesses(List<Process> processes) { |
| for (int i = 0; i < processes.size(); i++) { |
| Process p = processes.get(i); |
| if (i != 0) { |
| verifyNullStream(p.getOutputStream(), "getOutputStream"); |
| } |
| if (i == processes.size() - 1) { |
| verifyNullStream(p.getInputStream(), "getInputStream"); |
| verifyNullStream(p.getErrorStream(), "getErrorStream"); |
| } |
| } |
| } |
| |
| static void verifyNullStream(OutputStream s, String msg) { |
| try { |
| s.write(0xff); |
| fail("Stream should have been a NullStream" + msg); |
| } catch (IOException ie) { |
| // expected |
| } |
| } |
| |
| static void verifyNullStream(InputStream s, String msg) { |
| try { |
| int len = s.read(); |
| check(len == -1, "Stream should have been a NullStream" + msg); |
| } catch (IOException ie) { |
| // expected |
| } |
| } |
| |
| static void setFileContents(File file, String contents) { |
| try { |
| Writer w = new FileWriter(file); |
| w.write(contents); |
| w.close(); |
| } catch (Throwable t) { unexpected(t); } |
| } |
| |
| static String fileContents(File file) { |
| try { |
| Reader r = new FileReader(file); |
| StringBuilder sb = new StringBuilder(); |
| char[] buffer = new char[1024]; |
| int n; |
| while ((n = r.read(buffer)) != -1) |
| sb.append(buffer,0,n); |
| r.close(); |
| return new String(sb); |
| } catch (Throwable t) { unexpected(t); return ""; } |
| } |
| |
| //--------------------- Infrastructure --------------------------- |
| static volatile int passed = 0, failed = 0; |
| static void pass() {passed++;} |
| static void fail() {failed++; Thread.dumpStack();} |
| static void fail(String msg) {System.err.println(msg); fail();} |
| static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| static void check(boolean cond) {if (cond) pass(); else fail();} |
| static void check(boolean cond, String m) {if (cond) pass(); else fail(m);} |
| static void equal(Object x, Object y) { |
| if (x == null ? y == null : x.equals(y)) pass(); |
| else fail(">'" + x + "'<" + " not equal to " + "'" + y + "'"); |
| } |
| |
| public static void main(String[] args) throws Throwable { |
| try {realMain(args);} catch (Throwable t) {unexpected(t);} |
| System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| if (failed > 0) throw new AssertionError("Some tests failed"); |
| } |
| interface Fun {void f() throws Throwable;} |
| static void THROWS(Class<? extends Throwable> k, Fun... fs) { |
| for (Fun f : fs) |
| try { f.f(); fail("Expected " + k.getName() + " not thrown"); } |
| catch (Throwable t) { |
| if (k.isAssignableFrom(t.getClass())) pass(); |
| else unexpected(t);} |
| } |
| |
| } |