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java.lang.Object org.apache.tools.ant.ProjectComponent org.apache.tools.ant.Task org.apache.tools.ant.taskdefs.Parallel
public class Parallel
Executes the contained tasks in separate threads, continuing once all are completed.
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).
Nested Class Summary | |
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static class |
Parallel.TaskList
Class which holds a list of tasks to execute |
Field Summary |
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Fields inherited from class org.apache.tools.ant.Task |
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target, taskName, taskType, wrapper |
Fields inherited from class org.apache.tools.ant.ProjectComponent |
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description, location, project |
Constructor Summary | |
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Parallel()
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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. |
Methods inherited from class org.apache.tools.ant.Task |
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bindToOwner, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, init, isInvalid, log, log, log, log, maybeConfigure, perform, reconfigure, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType |
Methods inherited from class org.apache.tools.ant.ProjectComponent |
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clone, getDescription, getLocation, getProject, setDescription, setLocation, setProject |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public Parallel()
Method Detail |
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public void addDaemons(Parallel.TaskList daemonTasks)
daemonTasks
- The tasks to be executed as daemon.public void setPollInterval(int pollInterval)
pollInterval
- New value of property pollInterval.public void setFailOnAny(boolean failOnAny)
failOnAny
- if true any nested task failure causes parallel to
complete.public void addTask(Task nestedTask)
addTask
in interface TaskContainer
nestedTask
- Nested task to be executed in parallelpublic void setThreadsPerProcessor(int numThreadsPerProcessor)
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
.; optional
numThreadsPerProcessor
- Number of threads to create per available
processor.public void setThreadCount(int numThreads)
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
numThreads
- total number of threads.public void setTimeout(long timeout)
timeout
- timeout in milliseconds.public void execute() throws BuildException
execute
in class Task
BuildException
- if any of the threads failed.
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