private boolean _suspend(long time, TimeUnit unit, boolean failOnError)
throws IllegalStateException {
boolean suspendSuccessful = false;
try {
executionStateMonitor.enter();
switch (executionState) {
case RESUMED:
break;
case SUSPENDED:
case CANCELLED:
if (failOnError) {
throw new IllegalStateException(
LocalizationMessages.ILLEGAL_INVOCATION_CONTEXT_STATE(executionState, "suspend"));
}
break;
case RUNNING:
executionState = State.SUSPENDED;
suspendSuccessful = true;
}
} finally {
executionStateMonitor.leave();
}
// we don't want to invoke the callback or log message
// as part of the synchronized code
if (suspendSuccessful) {
callback.suspended(time, unit, this);
} else {
// already resumed - just log fine message & ignore the call
LOGGER.log(Level.FINE, LocalizationMessages.REQUEST_SUSPEND_FAILED(executionState));
}
return suspendSuccessful;
}
private void resume(final Runnable resumeHandler) {
if (executionStateMonitor.enterIf(resumableState)) {
final boolean invokeCallback;
try {
invokeCallback = executionState == State.SUSPENDED;
executionState = State.RESUMED;
} finally {
executionStateMonitor.leave();
}
try {
resumeHandler.run();
} finally {
if (invokeCallback) {
callback.resumed();
}
}
} else {
throw new IllegalStateException(
LocalizationMessages.ILLEGAL_INVOCATION_CONTEXT_STATE(executionState, "resume"));
}
}