[Java] Class ProcessGroovyMethods

  • org.codehaus.groovy.runtime.ProcessGroovyMethods

This class defines new groovy methods which appear on normal JDK classes related to process management.

Static methods are used with the first parameter being the destination class, i.e. public static String reverse(String self) provides a reverse() method for String.

NOTE: While this class contains many 'public' static methods, it is primarily regarded as an internal class (its internal package name suggests this also). We value backwards compatibility of these methods when used within Groovy but value less backwards compatibility at the Java method call level. I.e. future versions of Groovy may remove or move a method call in this file but would normally aim to keep the method available from within Groovy.

Nested Class Summary

Nested classes
Modifiers Name Description
protected static class ProcessGroovyMethods.ProcessRunner A Runnable which waits for a process to complete together with a notification scheme allowing another thread to wait a maximum number of seconds for the process to complete before killing it.

Methods Summary

Methods
Type Params Return Type Name and description
static void closeStreams(Process self)
Closes all the streams associated with the process (ignoring any IOExceptions).
static Thread consumeProcessErrorStream(Process self, OutputStream err)
Gets the error stream from a process and reads it to keep the process from blocking due to a full buffer.
static Thread consumeProcessErrorStream(Process self, Appendable error)
Gets the error stream from a process and reads it to keep the process from blocking due to a full buffer.
static void consumeProcessOutput(Process self)
Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer.
static void consumeProcessOutput(Process self, Appendable output, Appendable error)
Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer.
static void consumeProcessOutput(Process self, OutputStream output, OutputStream error)
Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer.
static Thread consumeProcessOutputStream(Process self, Appendable output)
Gets the output stream from a process and reads it to keep the process from blocking due to a full output buffer.
static Thread consumeProcessOutputStream(Process self, OutputStream output)
Gets the output stream from a process and reads it to keep the process from blocking due to a full output buffer.
static Process execute(String self)
Executes the command specified by self as a command-line process.
static Process execute(String self, String[] envp, File dir)
Executes the command specified by self with environment defined by envp and under the working directory dir.
static Process execute(String self, List envp, File dir)
Executes the command specified by self with environment defined by envp and under the working directory dir.
static Process execute(String[] commandArray)
Executes the command specified by the given String array.
static Process execute(String[] commandArray, String[] envp, File dir)
Executes the command specified by the String array given in the first parameter, with the environment defined by envp and under the working directory dir.
static Process execute(String[] commandArray, List envp, File dir)
Executes the command specified by the String array given in the first parameter, with the environment defined by envp and under the working directory dir.
static Process execute(List commands)
Executes the command specified by the given list.
static Process execute(List commands, String[] envp, File dir)
Executes the command specified by the given list, with the environment defined by envp and under the working directory dir.
static Process execute(List commands, List envp, File dir)
Executes the command specified by the given list, with the environment defined by envp and under the working directory dir.
static InputStream getErr(Process self)
An alias method so that a process appears similar to System.out, System.in, System.err; you can use process.in, process.out, process.err in a similar fashion.
static InputStream getIn(Process self)
An alias method so that a process appears similar to System.out, System.in, System.err; you can use process.in, process.out, process.err in a similar fashion.
static OutputStream getOut(Process self)
An alias method so that a process appears similar to System.out, System.in, System.err; you can use process.in, process.out, process.err in a similar fashion.
static String getText(Process self)
Read the text of the output stream of the Process.
static Writer leftShift(Process self, Object value)
Overloads the left shift operator (<<) to provide an append mechanism to pipe data to a Process.
static OutputStream leftShift(Process self, byte[] value)
Overloads the left shift operator to provide an append mechanism to pipe into a Process
static Process or(Process left, Process right)
Overrides the or operator to allow one Process to asynchronously pipe data to another Process.
static Process pipeTo(Process left, Process right)
Allows one Process to asynchronously pipe data to another Process.
static void waitForOrKill(Process self, long numberOfMillis)
Wait for the process to finish during a certain amount of time, otherwise stops the process.
static void waitForProcessOutput(Process self)
Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer.
static void waitForProcessOutput(Process self, Appendable output, Appendable error)
Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer.
static void waitForProcessOutput(Process self, OutputStream output, OutputStream error)
Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer.
static void withOutputStream(Process self, Closure closure)
Creates a new buffered OutputStream as stdin for this process, passes it to the closure, and ensures the stream is flushed and closed after the closure returns.
static void withWriter(Process self, Closure closure)
Creates a new BufferedWriter as stdin for this process, passes it to the closure, and ensures the stream is flushed and closed after the closure returns.

Inherited Methods Summary

Inherited Methods
Methods inherited from class Name
class DefaultGroovyMethodsSupport cloneSimilarCollection, cloneSimilarMap, closeQuietly, closeWithWarning, createSimilarArray, createSimilarCollection, createSimilarCollection, createSimilarCollection, createSimilarList, createSimilarMap, createSimilarOrDefaultCollection, createSimilarSet, normaliseIndex, sameType, subListBorders, subListBorders
class Object wait, wait, wait, equals, toString, hashCode, getClass, notify, notifyAll

Method Detail

public static void closeStreams(Process self)

Closes all the streams associated with the process (ignoring any IOExceptions).

Parameters:
self - a Process
Since:
2.1

public static Thread consumeProcessErrorStream(Process self, OutputStream err)

Gets the error stream from a process and reads it to keep the process from blocking due to a full buffer. The processed stream data is appended to the supplied OutputStream. A new Thread is started, so this method will return immediately.

Parameters:
self - a Process
err - an OutputStream to capture the process stderr
Returns:
the Thread
Since:
1.5.2

public static Thread consumeProcessErrorStream(Process self, Appendable error)

Gets the error stream from a process and reads it to keep the process from blocking due to a full buffer. The processed stream data is appended to the supplied Appendable. A new Thread is started, so this method will return immediately.

Parameters:
self - a Process
error - an Appendable to capture the process stderr
Returns:
the Thread
Since:
1.7.5

public static void consumeProcessOutput(Process self)

Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer. The stream data is thrown away but blocking due to a full output buffer is avoided. Use this method if you don't care about the standard or error output and just want the process to run silently - use carefully however, because since the stream data is thrown away, it might be difficult to track down when something goes wrong. For this, two Threads are started, so this method will return immediately.

Parameters:
self - a Process
Since:
1.0

public static void consumeProcessOutput(Process self, Appendable output, Appendable error)

Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer. The processed stream data is appended to the supplied Appendable. For this, two Threads are started, so this method will return immediately. The threads will not be join()ed, even if waitFor() is called. To wait for the output to be fully consumed call waitForProcessOutput().

Parameters:
self - a Process
output - an Appendable to capture the process stdout
error - an Appendable to capture the process stderr
Since:
1.7.5

public static void consumeProcessOutput(Process self, OutputStream output, OutputStream error)

Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer. The processed stream data is appended to the supplied OutputStream. For this, two Threads are started, so this method will return immediately. The threads will not be join()ed, even if waitFor() is called. To wait for the output to be fully consumed call waitForProcessOutput().

Parameters:
self - a Process
output - an OutputStream to capture the process stdout
error - an OutputStream to capture the process stderr
Since:
1.5.2

public static Thread consumeProcessOutputStream(Process self, Appendable output)

Gets the output stream from a process and reads it to keep the process from blocking due to a full output buffer. The processed stream data is appended to the supplied Appendable. A new Thread is started, so this method will return immediately.

Parameters:
self - a Process
output - an Appendable to capture the process stdout
Returns:
the Thread
Since:
1.7.5

public static Thread consumeProcessOutputStream(Process self, OutputStream output)

Gets the output stream from a process and reads it to keep the process from blocking due to a full output buffer. The processed stream data is appended to the supplied OutputStream. A new Thread is started, so this method will return immediately.

Parameters:
self - a Process
output - an OutputStream to capture the process stdout
Returns:
the Thread
Since:
1.5.2

public static Process execute(String self)

Executes the command specified by self as a command-line process.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
self - a command line String
Returns:
the Process which has just started for this command line representation
Since:
1.0

public static Process execute(String self, String[] envp, File dir)

Executes the command specified by self with environment defined by envp and under the working directory dir.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
self - a command line String to be executed.
envp - an array of Strings, each element of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.
dir - the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process.
Returns:
the Process which has just started for this command line representation.
Since:
1.0

public static Process execute(String self, List envp, File dir)

Executes the command specified by self with environment defined by envp and under the working directory dir.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
self - a command line String to be executed.
envp - a List of Objects (converted to Strings using toString), each member of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.
dir - the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process.
Returns:
the Process which has just started for this command line representation.
Since:
1.0

public static Process execute(String[] commandArray)

Executes the command specified by the given String array. The first item in the array is the command; the others are the parameters.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
commandArray - an array of String containing the command name and parameters as separate items in the array.
Returns:
the Process which has just started for this command line representation.
Since:
1.0

public static Process execute(String[] commandArray, String[] envp, File dir)

Executes the command specified by the String array given in the first parameter, with the environment defined by envp and under the working directory dir. The first item in the array is the command; the others are the parameters.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
commandArray - an array of String containing the command name and parameters as separate items in the array.
envp - an array of Strings, each member of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.
dir - the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process.
Returns:
the Process which has just started for this command line representation.
Since:
1.7.1

public static Process execute(String[] commandArray, List envp, File dir)

Executes the command specified by the String array given in the first parameter, with the environment defined by envp and under the working directory dir. The first item in the array is the command; the others are the parameters.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
commandArray - an array of String containing the command name and parameters as separate items in the array.
envp - a List of Objects (converted to Strings using toString), each member of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.
dir - the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process.
Returns:
the Process which has just started for this command line representation.
Since:
1.7.1

public static Process execute(List commands)

Executes the command specified by the given list. The toString() method is called for each item in the list to convert into a resulting String. The first item in the list is the command the others are the parameters.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
commands - a list containing the command name and parameters as separate items in the list.
Returns:
the Process which has just started for this command line representation.
Since:
1.0

public static Process execute(List commands, String[] envp, File dir)

Executes the command specified by the given list, with the environment defined by envp and under the working directory dir. The first item in the list is the command; the others are the parameters. The toString() method is called on items in the list to convert them to Strings.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
commands - a List containing the command name and parameters as separate items in the list.
envp - an array of Strings, each member of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.
dir - the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process.
Returns:
the Process which has just started for this command line representation.
Since:
1.7.1

public static Process execute(List commands, List envp, File dir)

Executes the command specified by the given list, with the environment defined by envp and under the working directory dir. The first item in the list is the command; the others are the parameters. The toString() method is called on items in the list to convert them to Strings.

For more control over Process construction you can use java.lang.ProcessBuilder.

throws:
IOException if an IOException occurs.
Parameters:
commands - a List containing the command name and parameters as separate items in the list.
envp - a List of Objects (converted to Strings using toString), each member of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.
dir - the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process.
Returns:
the Process which has just started for this command line representation.
Since:
1.7.1

public static InputStream getErr(Process self)

An alias method so that a process appears similar to System.out, System.in, System.err; you can use process.in, process.out, process.err in a similar fashion.

Parameters:
self - a Process instance
Returns:
the error InputStream for the process
Since:
1.0

public static InputStream getIn(Process self)

An alias method so that a process appears similar to System.out, System.in, System.err; you can use process.in, process.out, process.err in a similar fashion.

Parameters:
self - a Process instance
Returns:
the InputStream for the process
Since:
1.0

public static OutputStream getOut(Process self)

An alias method so that a process appears similar to System.out, System.in, System.err; you can use process.in, process.out, process.err in a similar fashion.

Parameters:
self - a Process instance
Returns:
the OutputStream for the process
Since:
1.0

public static String getText(Process self)

Read the text of the output stream of the Process. Closes all the streams associated with the process after retrieving the text.

throws:
java.io.IOException if an IOException occurs.
Parameters:
self - a Process instance
Returns:
the text of the output
Since:
1.0

public static Writer leftShift(Process self, Object value)

Overloads the left shift operator (<<) to provide an append mechanism to pipe data to a Process.

throws:
java.io.IOException if an IOException occurs.
Parameters:
self - a Process instance
value - a value to append
Returns:
a Writer
Since:
1.0

public static OutputStream leftShift(Process self, byte[] value)

Overloads the left shift operator to provide an append mechanism to pipe into a Process

throws:
java.io.IOException if an IOException occurs.
Parameters:
self - a Process instance
value - data to append
Returns:
an OutputStream
Since:
1.0

public static Process or(Process left, Process right)

Overrides the or operator to allow one Process to asynchronously pipe data to another Process.

throws:
java.io.IOException if an IOException occurs.
Parameters:
left - a Process instance
right - a Process to pipe output to
Returns:
the second Process to allow chaining
Since:
1.5.1

public static Process pipeTo(Process left, Process right)

Allows one Process to asynchronously pipe data to another Process.

throws:
java.io.IOException if an IOException occurs.
Parameters:
left - a Process instance
right - a Process to pipe output to
Returns:
the second Process to allow chaining
Since:
1.5.2

public static void waitForOrKill(Process self, long numberOfMillis)

Wait for the process to finish during a certain amount of time, otherwise stops the process.

Parameters:
self - a Process
numberOfMillis - the number of milliseconds to wait before stopping the process
Since:
1.0

public static void waitForProcessOutput(Process self)

Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer. The stream data is thrown away but blocking due to a full output buffer is avoided. Use this method if you don't care about the standard or error output and just want the process to run silently - use carefully however, because since the stream data is thrown away, it might be difficult to track down when something goes wrong. For this, two Threads are started, but join()ed, so we wait. As implied by the waitFor... name, we also wait until we finish as well. Finally, the output and error streams are closed.

Parameters:
self - a Process
Since:
1.6.5

public static void waitForProcessOutput(Process self, Appendable output, Appendable error)

Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer. The processed stream data is appended to the supplied Appendable. For this, two Threads are started, but join()ed, so we wait. As implied by the waitFor... name, we also wait until we finish as well. Finally, the input, output and error streams are closed.

Parameters:
self - a Process
output - an Appendable to capture the process stdout
error - an Appendable to capture the process stderr
Since:
1.7.5

public static void waitForProcessOutput(Process self, OutputStream output, OutputStream error)

Gets the output and error streams from a process and reads them to keep the process from blocking due to a full output buffer. The processed stream data is appended to the supplied OutputStream. For this, two Threads are started, but join()ed, so we wait. As implied by the waitFor... name, we also wait until we finish as well. Finally, the input, output and error streams are closed.

Parameters:
self - a Process
output - an OutputStream to capture the process stdout
error - an OutputStream to capture the process stderr
Since:
1.6.5

public static void withOutputStream(Process self, Closure closure)

Creates a new buffered OutputStream as stdin for this process, passes it to the closure, and ensures the stream is flushed and closed after the closure returns. A new Thread is started, so this method will return immediately.

Parameters:
self - a Process
closure - a closure
Since:
1.5.2

public static void withWriter(Process self, Closure closure)

Creates a new BufferedWriter as stdin for this process, passes it to the closure, and ensures the stream is flushed and closed after the closure returns. A new Thread is started, so this method will return immediately.

Parameters:
self - a Process
closure - a closure
Since:
1.5.2

© 2003-2020 The Apache Software Foundation
Licensed under the Apache license.
https://docs.groovy-lang.org/2.4.21/html/gapi/org/codehaus/groovy/runtime/ProcessGroovyMethods.html