util
Class Streams.PipeHandler

java.lang.Object
  util.Streams.PipeHandler

Enclosing class:

Streams

public static class Streams.PipeHandler
extends Object

Controller for handling all three streams for a child process asynchronously. Each of stdin, stdout, and stderr can be connected to any suitable stream; the child process's corresponding streams will be connected automatically in a multithreaded, asynchronous manner.

Field Summary

BufferedInputStream	childErr The child's standard error stream, which, to the parent, is an input stream.
BufferedOutputStream	childIn The child's standard input stream, which, to the parent, is an output stream.
BufferedInputStream	childOut The child's standard output stream, which, to the parent, is an input stream.
BufferedOutputStream	parentErr An output stream supplied by the parent, to be connected to the child's standard error.
BufferedInputStream	parentIn An input stream supplied by the parent, to be connected to the child's standard input.
BufferedOutputStream	parentOut An output stream supplied by the parent, to be connected to the child's standard output.

Constructor Summary

Streams.PipeHandler(InputStream parentIn, OutputStream childIn, OutputStream parentOut, InputStream childOut, OutputStream parentErr, InputStream childErr)
Construct a pipe handler.

Method Summary

void	finish() Stop forwarding data, flushing all output.
void	handle() Run the pipe handler, forwarding data along the given connections.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

childOut

public final BufferedInputStream childOut

The child's standard output stream, which, to the parent, is an input stream.

childErr

public final BufferedInputStream childErr

The child's standard error stream, which, to the parent, is an input stream.

parentIn

public final BufferedInputStream parentIn

An input stream supplied by the parent, to be connected to the child's standard input.

childIn

public final BufferedOutputStream childIn

The child's standard input stream, which, to the parent, is an output stream.

parentOut

public final BufferedOutputStream parentOut

An output stream supplied by the parent, to be connected to the child's standard output.

parentErr

public final BufferedOutputStream parentErr

An output stream supplied by the parent, to be connected to the child's standard error.

Constructor Detail

Streams.PipeHandler

public Streams.PipeHandler(InputStream parentIn,
                           OutputStream childIn,
                           OutputStream parentOut,
                           InputStream childOut,
                           OutputStream parentErr,
                           InputStream childErr)

Construct a pipe handler.

Parameters:

parentIn - The stream to use for input.

childIn - The child's standard input stream.

parentOut - The stream to use for output.

childOut - The child's standard output stream.

parentErr - The stream to use for stderr.

childErr - The child's standard error stream.

Method Detail

handle

public void handle()
            throws IOException

Run the pipe handler, forwarding data along the given connections.

Throws:

IOException - If anything goes wrong with any of the streams.

finish

public void finish()
            throws IOException

Stop forwarding data, flushing all output.

Throws:

IOException - If anything goes wrong.