Package org.kiwiproject.beta.base.process

Class ProcessOutputHandler

java.lang.Object

org.kiwiproject.beta.base.process.ProcessOutputHandler

All Implemented Interfaces:

Closeable, AutoCloseable

@Beta
public class ProcessOutputHandler
extends Object
implements Closeable

For a given Process, consume its standard or error output and send it to a Consumer for processing. The main use case is when your code launches a process and needs to receive and handle the standard output and/or error of that process. Each process is handled asynchronously via tasks submitted to an ExecutorService.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	ProcessOutputHandler.ProcessOutputType	The type of output from the process.
static enum	ProcessOutputHandler.Result	The return type for the handler methods.

Constructor Summary

Constructors

Constructor	Description
ProcessOutputHandler(int threadPoolSize, int bufferCapacityBytes, long sleepTimeMillis)	Create new instance.
ProcessOutputHandler(ProcessOutputHandlerConfig config)	Create new instance.

Method Summary

Modifier and Type	Method	Description
void	close()
ProcessOutputHandler.Result	handle(Process process, ProcessOutputHandler.ProcessOutputType outputType, Consumer<String> outputConsumer)	Handle the output or error output of the given process.
ProcessOutputHandler.Result	handleErrorOutput(Process process, Consumer<String> errorConsumer)	Handle the error output of the given process.
ProcessOutputHandler.Result	handleStandardOutput(Process process, Consumer<String> outputConsumer)	Handle the standard output of the given process.

Methods inherited from class java.lang.Object

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

Constructor Details

ProcessOutputHandler

public ProcessOutputHandler(ProcessOutputHandlerConfig config)

Create new instance.

Parameters:

config - the configuration to use

See Also:

• ProcessOutputHandler(int, int, long)

ProcessOutputHandler

public ProcessOutputHandler(int threadPoolSize,
 int bufferCapacityBytes,
 long sleepTimeMillis)

Create new instance.

Parameters:

threadPoolSize - the number of threads to use when handling process output

bufferCapacityBytes - the size of the buffer that will be used when reading process output (in bytes)

sleepTimeMillis - the amount of time to sleep between reading output from the process (in milliseconds)

See Also:

• ProcessOutputHandler(ProcessOutputHandlerConfig)

Method Details

handleStandardOutput

public ProcessOutputHandler.Result handleStandardOutput(Process process,
 Consumer<String> outputConsumer)

Handle the standard output of the given process.

Note that the consumer will receive output in chunks up to the size of the buffer capacity. Each chunk might only be a fraction of the buffer size.

Parameters:

process - the process

outputConsumer - a Consumer that will handle the standard output of the process

Returns:

the Result

See Also:

• Process.getInputStream()

handleErrorOutput

public ProcessOutputHandler.Result handleErrorOutput(Process process,
 Consumer<String> errorConsumer)

Handle the error output of the given process.

Note that the consumer will receive output in chunks up to the size of the buffer capacity. Each chunk might only be a fraction of the buffer size.

Parameters:

process - the process

errorConsumer - a Consumer that will handle the error output of the process

Returns:

the Result

See Also:

• Process.getErrorStream()

handle

public ProcessOutputHandler.Result handle(Process process,
 ProcessOutputHandler.ProcessOutputType outputType,
 Consumer<String> outputConsumer)

Handle the output or error output of the given process.

Note that the consumer will receive output in chunks up to the size of the buffer capacity. Each chunk might only be a fraction of the buffer size.

Parameters:

process - the process

outputType - what type of process to handle

outputConsumer - a Consumer that will handle the selected type of process output

Returns:

the Result

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable