/**
* Try to execute all waiting processes. A process can be either executed, skipped or left
* waiting, using the following rules:
*
* <ul>
* <li>If the waiting process has incoming conditional parameters and one of these parameters is
* not set, the process is skipped.
* <li>If all of the parameters of the process are ready, execute the process.
* </ul>
*/
private void tryToExecuteWaitingInstances() {
final Set<OPMProcess> followingProcesses = Sets.newHashSet();
OPMInstanceExecutor instanceExecutor;
for (final Iterator<OPMProcessInstance> waitingInstanceIt = waitingInstances.iterator();
waitingInstanceIt.hasNext(); ) {
OPMProcessInstance waitingInstance = waitingInstanceIt.next();
instanceExecutor = new OPMInstanceExecutor(waitingInstance, this);
instanceExecutor.tryToExecuteInstance();
if (instanceExecutor.wasNotExecuted()) {
// do nothing
} else if (instanceExecutor.wasSkipped()) {
addSkippedProcess(instanceExecutor.getProcess());
followingProcesses.addAll(calculateFollowingProcesses(instanceExecutor));
waitingInstanceIt.remove();
} else {
executingInstances.add(waitingInstance);
waitingInstanceIt.remove();
}
}
putProcessesInWaitingList(followingProcesses);
}
private Set<OPMProcess> calculateFollowingProcesses(OPMInstanceExecutor instanceExecutor) {
final Set<OPMProcess> followingProcesses = Sets.newHashSet();
if (instanceExecutor.wasExecuted()) {
for (Parameter parameter : instanceExecutor.getOutgoingParameters())
followingProcesses.addAll(OPDAnalysis.findConnectedEventProcesses(parameter.getObject()));
followingProcesses.addAll(OPDAnalysis.findInvocationProcesses(instanceExecutor.getProcess()));
}
followingProcesses.addAll(findNextProcessesToExecute(instanceExecutor.getProcess()));
return followingProcesses;
}
private void waitForInstanceToFinish() {
OPMInstanceExecutor executor = null;
while (true) {
try {
executor = getResultQueue().take();
executingInstances.remove(executor.getInstance());
break;
} catch (InterruptedException e) {
if (isStopped()) {
return;
} else {
logger.finest(
"Thread interrupted while waiting for result from queue. Will continue waiting.");
}
}
}
executor.finishExecution();
addExecutedProcess(executor.getProcess());
putProcessesInWaitingList(calculateFollowingProcesses(executor));
}