private void callStartExpr(Call call, InputChannel ichannel, Process p, Any root, Any context)
throws AnyException {
// The call isn't handled in the conventional sense. This is because
// we want to *resolve* the arguments w.r.t the current context
// and *call* the function with the context of the root of the
// new process's node space,
// First, try to resolve the call target. We need to do this
// so we can get it's parameter definitions.
AbstractInputFunc calledFunc = call.resolveFunc(context, getTransaction());
if (calledFunc == null) throw new AnyException("Could not resolve function " + call);
// Note that this is the original fn from the catalog. We want
// to set the flag in here....
calledFunc.startUse();
try {
// Put the transaction in
call.setTransaction(getTransaction());
// Resolve the arguments against the current context
Map startArgs = call.resolveArgs(context, calledFunc, getTransaction());
// Put the given input channel and new process on the stack
startArgs.replaceItem(ServerConstants.ICHANNEL, ichannel);
startArgs.replaceItem(ServerConstants.PROCESS, p);
Call.call((Func) calledFunc.cloneAny(), startArgs, root, getTransaction(), calledFunc);
} finally {
calledFunc.endUse();
}
}
public Any exec(Any a) throws AnyException {
Any processName = EvalExpr.evalFunc(getTransaction(), a, processName_);
Any processType = EvalExpr.evalFunc(getTransaction(), a, processType_);
InputChannel inputChannel =
(InputChannel) EvalExpr.evalFunc(getTransaction(), a, inputChannel_, InputChannel.class);
OutputChannel outputChannel =
(OutputChannel) EvalExpr.evalFunc(getTransaction(), a, outputChannel_, OutputChannel.class);
BooleanI syncExternal =
(BooleanI) EvalExpr.evalFunc(getTransaction(), a, syncExternal_, BooleanI.class);
// callOnStart/End are already Call objects, not references
// so we don't need to resolve them.
if (processName == null) nullOperand(processName_);
if (processType == null) nullOperand(processType_);
Process parent = null;
if (processType.equals(Process.CHILD)) parent = getTransaction().getProcess();
else if (!processType.equals(Process.DETACHED)) throw new AnyException("Illegal process type");
if (inputChannel == null && inputChannel_ != null) nullOperand(inputChannel_);
if (syncExternal == null && syncExternal_ != null) nullOperand(syncExternal_);
if (outputChannel == null && outputChannel_ != null) nullOperand(outputChannel_);
// If no input channel is specified, create a new one.
if (inputChannel == null)
inputChannel = new AnyChannel(new FIFO(0, ChannelConstants.REFERENCE));
else inputChannel = inputChannel.getUnderlyingChannel();
// Create the new process's node space
BasicProcess.RootMap root = new BasicProcess.RootMap();
Transaction t = new PrimaryTransaction();
EventDispatcher ed = new EventDispatcher();
ed.addEventListener(InvokeService.makeInvokeService(EventConstants.INVOKE_SVC, t, root));
ed.addEventListener(new DispatchListener(root, t));
// ExceptionHandler eh = new ExceptionToStream(System.out);
ExceptionHandler eh = new ExceptionToFunc();
UserProcess p =
new UserProcess(
processName, inputChannel, outputChannel, eh, t, root, ed, parent, callOnEnd_);
root.setProcess(p);
// If the process will be 'shared' by other threads (such as
// JMS asynchronous listeners or any threading model behind
// client code using AbstractPlugin) then this operand must
// be set to true.
// The object these threads synchronize on must, of course,
// be unique to the new process, so make something new.
if (syncExternal != null && syncExternal.getValue()) p.setSync(new AnyObject());
// If there's a start call then run it now in the
// spawning process's thread but in the spawned
// process's node space
if (callOnStart_ != null) {
Call callOnStart = (Call) callOnStart_.cloneAny();
callStartExpr(callOnStart, inputChannel, p, root, a);
}
// Pass on caller's privilege levels
Process currProc = getTransaction().getProcess();
// Just for server startup main() currProc can be null
if (currProc != null) {
p.setRealPrivilegeLevel(currProc.getRealPrivilegeLevel());
p.setEffectivePrivilegeLevel(currProc.getEffectivePrivilegeLevel());
// Start the new process's thread. If there is no calling
// process then we assume this class is being run from
// code, not script, so in case that code has any concurrency
// issues we expect it to call startThread().
p.startThread();
}
return p;
}
