import java.util.List;
+import jalview.bin.Console;
import jalview.ws2.api.JobStatus;
import jalview.ws2.api.WebServiceJobHandle;
* @param subJobs
* list of sub-jobs for this run
*/
- void taskStarted(TaskI<T> source, List<? extends JobI> subJobs);
+ default void taskStarted(TaskI<T> source, List<? extends JobI> subJobs) {};
/**
* Invoked when the global task status has changed.
* @param status
* new task status
*/
- void taskStatusChanged(TaskI<T> source, JobStatus status);
+ default void taskStatusChanged(TaskI<T> source, JobStatus status) {};
/**
* Invoked when the task has completed. If the task completed with a result,
* @param result
* computation result or null if result not present
*/
- void taskCompleted(TaskI<T> source, T result);
+ default void taskCompleted(TaskI<T> source, T result) {};
/**
* Invoked when an unhandled exception has occurred during task execution.
* @param e
* exception
*/
- void taskException(TaskI<T> source, Exception e);
-
+ default void taskException(TaskI<T> source, Exception e) {};
/**
* Invoked when the status of a sub-job has changed.
* @param status
* new job status
*/
- void subJobStatusChanged(TaskI<T> source, JobI job, JobStatus status);
+ default void subJobStatusChanged(TaskI<T> source, JobI job, JobStatus status) {};
/**
* Invoked when a log string of the sub-job has changed.
* @param log
* new log string
*/
- void subJobLogChanged(TaskI<T> source, JobI job, String log);
+ default void subJobLogChanged(TaskI<T> source, JobI job, String log) {};
/**
* Invoked when an error log string of the sub-job has changed.
* @param log
* new log string
*/
- void subJobErrorLogChanged(TaskI<T> source, JobI job, String log);
+ default void subJobErrorLogChanged(TaskI<T> source, JobI job, String log) {};
+
+ @SuppressWarnings("rawtypes")
+ static final TaskEventListener NULL_LISTENER = new TaskEventListener()
+ {
+ @Override
+ public void taskStarted(TaskI source, List subJobs)
+ {
+ Console.info("task started with " + subJobs.size() + " jobs");
+ }
+
+ @Override
+ public void taskStatusChanged(TaskI source, JobStatus status)
+ {
+ Console.info("task status " + status);
+ }
+
+ @Override
+ public void taskCompleted(TaskI source, Object result)
+ {
+ Console.info("task completed");
+ }
+
+ @Override
+ public void taskException(TaskI source, Exception e)
+ {
+ Console.info("task failed", e);
+ }
+
+ @Override
+ public void subJobStatusChanged(TaskI source, JobI job,
+ JobStatus status)
+ {
+ Console.info("sub-job " + job.getInternalId() + " status " + status);
+ }
+
+ @Override
+ public void subJobLogChanged(TaskI source, JobI job, String log)
+ {
+ }
+
+ @Override
+ public void subJobErrorLogChanged(TaskI source, JobI job, String log)
+ {
+ }
+ };
+
+ @SuppressWarnings("unchecked")
+ static <T> TaskEventListener<T> nullListener()
+ {
+ return (TaskEventListener<T>) NULL_LISTENER;
+ }
}