private List<String> terminateNodes(Status endStatus) {
List<String> endNodes = new ArrayList<String>();
for (Map.Entry<String, NodeInstance> entry : executionPaths.entrySet()) {
if (entry.getValue().started) {
NodeDef nodeDef = def.getNode(entry.getValue().nodeName);
if (!(nodeDef instanceof ControlNodeDef)) {
NodeHandler nodeHandler = newInstance(nodeDef.getHandlerClass());
try {
if (endStatus == Status.KILLED) {
nodeHandler.kill(new Context(nodeDef, entry.getKey(), null));
} else {
if (endStatus == Status.FAILED) {
nodeHandler.fail(new Context(nodeDef, entry.getKey(), null));
}
}
endNodes.add(nodeDef.getName());
} catch (Exception ex) {
log.warn(
XLog.STD,
"Error Changing node state to [{0}] for Node [{1}]",
endStatus.toString(),
nodeDef.getName(),
ex);
}
}
}
}
return endNodes;
}
public static String wrapperToXml(DOMWrapper wrapper, boolean ignorePcdata) {
try {
NodeDef node;
switch (wrapper.getType()) {
case DOMWrapper.ELEMENT:
node = new WrapperElementDef(wrapper, null, null);
break;
case DOMWrapper.CDATA:
node = new CdataDef(wrapper);
break;
case DOMWrapper.FREETEXT:
node = new TextDef(wrapper);
break;
case DOMWrapper.COMMENT:
node = new CommentDef(wrapper);
break;
default:
throw new Error(
"unknown node type " + wrapper.getType() + " while converting node to xml");
}
StringWriter sw = new StringWriter();
XMLOutput out = new XMLOutput(sw);
out.setIgnorePcdata(ignorePcdata);
out.setGlob(true);
node.displayXML(out, 0);
return sw.toString();
} catch (XOMException e) {
throw new Error("[" + e.toString() + "] while converting node to xml");
}
}
private List<String> killNodes() {
List<String> killedNodes = new ArrayList<String>();
for (Map.Entry<String, NodeInstance> entry : executionPaths.entrySet()) {
String node = entry.getKey();
NodeInstance nodeInstance = entry.getValue();
if (nodeInstance.started) {
NodeDef nodeDef = def.getNode(nodeInstance.nodeName);
NodeHandler nodeHandler = newInstance(nodeDef.getHandlerClass());
try {
nodeHandler.kill(new Context(nodeDef, node, null));
killedNodes.add(nodeDef.getName());
} catch (Exception ex) {
log.warn(XLog.STD, "Error killing node [{0}]", nodeDef.getName(), ex);
}
}
}
return killedNodes;
}
private String failNode(String nodeName) {
String failedNode = null;
for (Map.Entry<String, NodeInstance> entry : executionPaths.entrySet()) {
String node = entry.getKey();
NodeInstance nodeInstance = entry.getValue();
if (nodeInstance.started && nodeInstance.nodeName.equals(nodeName)) {
NodeDef nodeDef = def.getNode(nodeInstance.nodeName);
NodeHandler nodeHandler = newInstance(nodeDef.getHandlerClass());
try {
nodeHandler.fail(new Context(nodeDef, node, null));
failedNode = nodeDef.getName();
nodeInstance.started = false;
} catch (Exception ex) {
log.warn(XLog.STD, "Error failing node [{0}]", nodeDef.getName(), ex);
}
return failedNode;
}
}
return failedNode;
}
public synchronized boolean signal(String executionPath, String signalValue)
throws WorkflowException {
ParamChecker.notEmpty(executionPath, "executionPath");
ParamChecker.notNull(signalValue, "signalValue");
log.debug(
XLog.STD,
"Signaling job execution path [{0}] signal value [{1}]",
executionPath,
signalValue);
if (status != Status.RUNNING) {
throw new WorkflowException(ErrorCode.E0716);
}
NodeInstance nodeJob = executionPaths.get(executionPath);
if (nodeJob == null) {
status = Status.FAILED;
log.error("invalid execution path [{0}]", executionPath);
}
NodeDef nodeDef = null;
if (!status.isEndState()) {
nodeDef = def.getNode(nodeJob.nodeName);
if (nodeDef == null) {
status = Status.FAILED;
log.error("invalid transition [{0}]", nodeJob.nodeName);
}
}
if (!status.isEndState()) {
NodeHandler nodeHandler = newInstance(nodeDef.getHandlerClass());
boolean exiting = true;
Context context = new Context(nodeDef, executionPath, signalValue);
if (!nodeJob.started) {
try {
nodeHandler.loopDetection(context);
exiting = nodeHandler.enter(context);
nodeJob.started = true;
} catch (WorkflowException ex) {
status = Status.FAILED;
List<String> killedNodes = terminateNodes(Status.KILLED);
if (killedNodes.size() > 1) {
log.warn(
XLog.STD,
"Workflow completed [{0}], killing [{1}] running nodes",
status,
killedNodes.size());
}
throw ex;
}
}
if (exiting) {
List<String> pathsToStart = new ArrayList<String>();
List<String> fullTransitions;
try {
fullTransitions = nodeHandler.multiExit(context);
int last = fullTransitions.size() - 1;
// TEST THIS
if (last >= 0) {
String transitionTo = getTransitionNode(fullTransitions.get(last));
if (nodeDef instanceof ForkNodeDef) {
transitionTo = "*"; // WF action cannot hold all transitions for a fork.
// transitions are hardcoded in the WF app.
}
persistentVars.put(
nodeDef.getName() + WorkflowInstance.NODE_VAR_SEPARATOR + TRANSITION_TO,
transitionTo);
}
} catch (WorkflowException ex) {
status = Status.FAILED;
throw ex;
}
if (context.status == Status.KILLED) {
status = Status.KILLED;
log.debug(XLog.STD, "Completing job, kill node [{0}]", nodeJob.nodeName);
} else {
if (context.status == Status.FAILED) {
status = Status.FAILED;
log.debug(XLog.STD, "Completing job, fail node [{0}]", nodeJob.nodeName);
} else {
if (context.status == Status.SUCCEEDED) {
status = Status.SUCCEEDED;
log.debug(XLog.STD, "Completing job, end node [{0}]", nodeJob.nodeName);
}
/*
else if (context.status == Status.SUSPENDED) {
status = Status.SUSPENDED;
log.debug(XLog.STD, "Completing job, end node [{0}]", nodeJob.nodeName);
}
*/
else {
for (String fullTransition : fullTransitions) {
// this is the whole trick for forking, we need the
// executionpath and the transition
// in the case of no forking last element of
// executionpath is different from transition
// in the case of forking they are the same
log.debug(
XLog.STD,
"Exiting node [{0}] with transition[{1}]",
nodeJob.nodeName,
fullTransition);
String execPathFromTransition = getExecutionPath(fullTransition);
String transition = getTransitionNode(fullTransition);
def.validateTransition(nodeJob.nodeName, transition);
NodeInstance nodeJobInPath = executionPaths.get(execPathFromTransition);
if ((nodeJobInPath == null) || (!transition.equals(nodeJobInPath.nodeName))) {
// TODO explain this IF better
// If the WfJob is signaled with the parent
// execution executionPath again
// The Fork node will execute again.. and replace
// the Node WorkflowJobBean
// so this is required to prevent that..
// Question : Should we throw an error in this case
// ??
executionPaths.put(execPathFromTransition, new NodeInstance(transition));
pathsToStart.add(execPathFromTransition);
}
}
// signal all new synch transitions
for (String pathToStart : pathsToStart) {
signal(pathToStart, "::synch::");
}
}
}
}
}
}
if (status.isEndState()) {
if (status == Status.FAILED) {
List<String> failedNodes = terminateNodes(status);
log.warn(
XLog.STD,
"Workflow completed [{0}], failing [{1}] running nodes",
status,
failedNodes.size());
} else {
List<String> killedNodes = terminateNodes(Status.KILLED);
if (killedNodes.size() > 1) {
log.warn(
XLog.STD,
"Workflow completed [{0}], killing [{1}] running nodes",
status,
killedNodes.size());
}
}
}
return status.isEndState();
}