Java tutorial
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For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. */ package com.thoughtworks.cruise.util.command; import static com.thoughtworks.cruise.util.ExceptionUtils.bomb; import static java.lang.String.format; import static java.nio.charset.Charset.defaultCharset; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.io.LineNumberReader; import java.io.UnsupportedEncodingException; import java.util.concurrent.TimeUnit; import org.apache.commons.io.IOUtils; import org.apache.commons.lang.StringUtils; import com.thoughtworks.cruise.util.Clock; import com.thoughtworks.cruise.util.SystemTimeClock; public class StreamPumper implements Runnable { private BufferedReader in; private boolean completed; private final StreamConsumer streamConsumer; private final String prefix; private long lastHeard; private final Clock clock; public StreamPumper(InputStream in, StreamConsumer streamConsumer, String prefix) { this(in, streamConsumer, prefix, null); } public StreamPumper(InputStream inputStream, StreamConsumer streamConsumer) { this(inputStream, streamConsumer, ""); } public StreamPumper(InputStream in, StreamConsumer streamConsumer, String prefix, String encoding) { this(in, streamConsumer, prefix, encoding, new SystemTimeClock()); } public StreamPumper(InputStream in, StreamConsumer streamConsumer, String prefix, String encoding, Clock clock) { this.streamConsumer = streamConsumer; this.prefix = prefix; this.clock = clock; this.lastHeard = System.currentTimeMillis(); try { if (encoding == null) { this.in = new LineNumberReader(new InputStreamReader(in)); } else { this.in = new LineNumberReader(new InputStreamReader(in, encoding)); } } catch (UnsupportedEncodingException e) { bomb(format("Unable to use [%s] to decode stream. The current charset is [%s]", encoding, defaultCharset())); } } public void run() { try { String s = in.readLine(); while (s != null) { consumeLine(s); s = in.readLine(); } } catch (Exception e) { // e.printStackTrace(); // do nothing } finally { IOUtils.closeQuietly(in); completed = true; } } private void consumeLine(String line) { lastHeard = System.currentTimeMillis(); if (streamConsumer != null) { if (StringUtils.isBlank(prefix)) { streamConsumer.consumeLine(line); } else { streamConsumer.consumeLine(prefix + line); } } } public static StreamPumper pump(InputStream stream, StreamConsumer streamConsumer) { return pump(stream, streamConsumer, ""); } public void readToEnd() { while (!completed) { try { clock.sleepForMillis(100); } catch (InterruptedException ignored) { } } } public static StreamPumper pump(InputStream stream, StreamConsumer streamConsumer, String prefix) { return pump(stream, streamConsumer, prefix, null); } public static StreamPumper pump(InputStream stream, StreamConsumer streamConsumer, String prefix, String encoding) { StreamPumper pumper = new StreamPumper(stream, streamConsumer, prefix, encoding); new Thread(pumper).start(); return pumper; } private Long timeSinceLastLine(TimeUnit unit) { long now = clock.currentTimeMillis(); return unit.convert(now - lastHeard, TimeUnit.MILLISECONDS); } public boolean didTimeout(long duration, TimeUnit unit) { if (completed) { return false; } return timeSinceLastLine(unit) > duration; } }