Package com.spotify.fmt

Class ForkingExecutor

java.lang.Object

com.spotify.fmt.ForkingExecutor

All Implemented Interfaces:

Closeable, AutoCloseable

class ForkingExecutor
extends Object
implements Closeable

An executor that executes a method in a sub-process JVM.

The function, its result and any thrown exception must be serializable as serialization is used to transport these between the processes.

Adapted from https://github.com/spotify/flo/blob/91d2e546bc8fa8e6fee9bc8c6dd484d87db3b0af/flo-runner/src/main/java/com/spotify/flo/context/ForkingExecutor.java

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private class	ForkingExecutor.Execution<T>
private static class	ForkingExecutor.Trampoline

Field Summary

Fields

Modifier and Type	Field	Description
private List<String>	configuredClasspath
private Map<String,String>	environment
private final List<ForkingExecutor.Execution<?>>	executions
private List<String>	javaArgs
private final org.apache.maven.plugin.logging.Log	log
private boolean	withDefaultClasspath

Constructor Summary

Constructors

Constructor	Description
ForkingExecutor(org.apache.maven.plugin.logging.Log log)

Method Summary

Modifier and Type	Method	Description
(package private) ForkingExecutor	classpath(Collection<String> classpath)
void	close()
private void	copyLines(InputStream in, PrintStream out)
private List<String>	defaultClasspath()
private static void	deleteDir(Path path)
(package private) ForkingExecutor	environment(Map<String,String> environment)
(package private) <T> T	execute(SerializableCallable<T> f)	Execute a function in a sub-process.
private List<String>	executionClassPath()
(package private) ForkingExecutor	javaArgs(String... javaArgs)
(package private) ForkingExecutor	javaArgs(List<String> javaArgs)
private void	tryDeleteDir(Path path)
(package private) ForkingExecutor	withDefaultClasspath(boolean withDefaultClasspath)

Methods inherited from class java.lang.Object

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

Field Details

log

private final org.apache.maven.plugin.logging.Log log

executions

private final List<ForkingExecutor.Execution<?>> executions

environment

private Map<String,String> environment

javaArgs

private List<String> javaArgs

withDefaultClasspath

private boolean withDefaultClasspath

configuredClasspath

private List<String> configuredClasspath

Constructor Details

ForkingExecutor

public ForkingExecutor(org.apache.maven.plugin.logging.Log log)

Method Details

environment

ForkingExecutor environment(Map<String,String> environment)

javaArgs

ForkingExecutor javaArgs(String... javaArgs)

javaArgs

ForkingExecutor javaArgs(List<String> javaArgs)

classpath

ForkingExecutor classpath(Collection<String> classpath)

withDefaultClasspath

ForkingExecutor withDefaultClasspath(boolean withDefaultClasspath)

defaultClasspath

private List<String> defaultClasspath()

executionClassPath

private List<String> executionClassPath()

execute

<T> T execute(SerializableCallable<T> f)
       throws IOException

Execute a function in a sub-process.

Parameters:

f - The function to execute.

Returns:

The return value of the function. Any exception thrown by the function the will be propagated and re-thrown.

Throws:

IOException - if

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

tryDeleteDir

private void tryDeleteDir(Path path)

deleteDir

private static void deleteDir(Path path)
                       throws IOException

Throws:

IOException

copyLines

private void copyLines(InputStream in,
 PrintStream out)