Examples of hudson.util.NullStream

hudson.util.NullStream
@author Kohsuke Kawaguchi

        try {
            log.rewind();
            return log;
        } catch (IOException e) {
            logger.log(Level.SEVERE, "Failed to create log file "+getLogFile(),e);
            return new NullStream();
        }
    }

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        /**
         * Returns true if the executable exists.
         */
        public boolean getExists() {
            try {
                return getExecutable(new LocalLauncher(new StreamTaskListener(new NullStream())))!=null;
            } catch (IOException e) {
                return false;
            } catch (InterruptedException e) {
                return false;
            }

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     * If it's not, then the user must specify a configured JDK,
     * so this is often useful for form field validation.
     */
    public static boolean isDefaultJDKValid(Node n) {
        try {
            TaskListener listener = new StreamTaskListener(new NullStream());
            Launcher launcher = n.createLauncher(listener);
            return launcher.launch().cmds("java","-fullversion").stdout(listener).join()==0;
        } catch (IOException e) {
            return false;
        } catch (InterruptedException e) {

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public class FilePathTest extends ChannelTestCase {


    public void testCopyTo() throws Exception {
        File tmp = File.createTempFile("testCopyTo","");
        FilePath f = new FilePath(french,tmp.getPath());
        f.copyTo(new NullStream());
        assertTrue("target does not exist", tmp.exists());
        assertTrue("could not delete target " + tmp.getPath(), tmp.delete());
    }

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        public void recycle() throws IOException {
            if(age>=MAX_AGE || maxProcess==0)
                discard();
            else {
                output.set(new NullStream());
                // make room for the new process and reuse.
                synchronized(parent.processes) {
                    while(parent.processes.size()>=maxProcess)
                        parent.processes.removeFirst().discard();
                    parent.processes.add(this);

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      buildEnvironment.put("ANDROID_SDK_HOME", sdk.getSdkHome());
    }
    if (launcher.isUnix()) {
      buildEnvironment.put("LD_LIBRARY_PATH", String.format("%s/tools/lib", sdk.getSdkRoot()));
    }
    return launcher.launch().stdout(new NullStream()).stderr(logger()).envs(buildEnvironment);
  }

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        // Start dumping logcat to temporary file
        final File artifactsDir = build.getArtifactsDir();
        final FilePath logcatFile = build.getWorkspace().createTextTempFile("logcat_", ".log", "", false);
        final OutputStream logcatStream = logcatFile.write();
        final String logcatArgs = String.format("-s %s logcat -v time", emu.serial());
        final Proc logWriter = emu.getToolProcStarter(Tool.ADB, logcatArgs).stdout(logcatStream).stderr(new NullStream()).start();


        // Unlock emulator by pressing the Menu key once, if required.
        // Upon first boot (and when the data is wiped) the emulator is already unlocked
        final long bootDuration = System.currentTimeMillis() - bootTime;
        if (emulatorAlreadyExists && !wipeData && snapshotState != SnapshotState.BOOT) {

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     * Instead of adding yet another filter, we switch the target stream to a null stream while concealing.
     *
     * Both the start- and stop-Method are idempotent and may be called regardless of current concealing state.
     */
    private void startConcealing() {
        this.out = new NullStream();
    }

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            while (!completed.get()) {
                if (jenkins == null || jenkins.isTerminating()) {
                    LOGGER.log(Level.FINE, "shutting down, breaking waitForCompletion on {0}", this);
                    // Stop writing content, in case a new set of objects gets loaded after in-VM restart and starts writing to the same file:
                    listener.closeQuietly();
                    listener = new StreamBuildListener(new NullStream());
                    break;
                }
                try {
                    completed.wait(1000);
                } catch (InterruptedException x) {

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                    OutputStream logger = new FileOutputStream(getLogFile(), true);
                    listener = new StreamBuildListener(logger, Charset.defaultCharset());
                    listener.getLogger().println("Resuming build");
                } catch (IOException x) {
                    LOGGER.log(Level.WARNING, null, x);
                    listener = new StreamBuildListener(new NullStream());
                }
                completed = new AtomicBoolean();
                Queue.getInstance().schedule(new AfterRestartTask(this), 0);
            }
        }

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