org.apache.tools.ant.taskdefs
public class Parallel extends Task implements TaskContainer
New behavior allows for the ant script to specify a maximum number of
threads that will be executed in parallel. One should be very careful about
using the waitFor
task when specifying threadCount
as it can cause deadlocks if the number of threads is too small or if one of
the nested tasks fails to execute completely. The task selection algorithm
will insure that the tasks listed before a task have started before that
task is started, but it will not insure a successful completion of those
tasks or that those tasks will finish first (i.e. it's a classic race
condition).
Since: Ant 1.4
UNKNOWN: category="control"
Nested Class Summary | |
---|---|
static class | Parallel.TaskList Class which holds a list of tasks to execute |
Method Summary | |
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void | addDaemons(Parallel.TaskList daemonTasks)
Add a group of daemon threads |
void | addTask(Task nestedTask)
Add a nested task to execute in parallel. |
void | execute()
Execute the parallel tasks
|
void | setFailOnAny(boolean failOnAny)
Control whether a failure in a nested task halts execution. |
void | setPollInterval(int pollInterval)
Interval to poll for completed threads when threadCount or
threadsPerProcessor is specified. |
void | setThreadCount(int numThreads)
Statically determine the maximum number of tasks to execute
simultaneously. |
void | setThreadsPerProcessor(int numThreadsPerProcessor)
Dynamically generates the number of threads to execute based on the
number of available processors (via
java.lang.Runtime.availableProcessors() ). |
void | setTimeout(long timeout)
Sets the timeout on this set of tasks. |
Parameters: daemonTasks The tasks to be executed as daemon.
Parameters: nestedTask Nested task to be executed in parallel
Throws: BuildException if any of the threads failed.
Parameters: failOnAny if true any nested task failure causes parallel to complete.
Parameters: pollInterval New value of property pollInterval.
threadCount
tasks will be executed at one time. If threadsPerProcessor
is set and the JVM is at least a 1.4 VM then this value is
ignored.; optional
Parameters: numThreads total number of threads.
java.lang.Runtime.availableProcessors()
). Requires a J2SE
1.4 VM, and it will overwrite the value set in threadCount.
If used in a 1.1, 1.2, or 1.3 VM then the task will defer to
threadCount
.; optionalParameters: numThreadsPerProcessor Number of threads to create per available processor.
Parameters: timeout timeout in milliseconds.