use of com.walmartlabs.concord.runtime.v2.model.FlowCall in project concord by walmartlabs.
the class FlowCallCommand method execute.
@Override
protected void execute(Runtime runtime, State state, ThreadId threadId) {
state.peekFrame(threadId).pop();
Context ctx = runtime.getService(Context.class);
ExpressionEvaluator ee = runtime.getService(ExpressionEvaluator.class);
EvalContext evalCtx = EvalContextFactory.global(ctx);
FlowCall call = getStep();
// the called flow's name
String flowName = ee.eval(evalCtx, call.getFlowName(), String.class);
// the called flow's steps
Compiler compiler = runtime.getService(Compiler.class);
ProcessDefinition pd = runtime.getService(ProcessDefinition.class);
ProcessConfiguration pc = runtime.getService(ProcessConfiguration.class);
Command steps = CompilerUtils.compile(compiler, pc, pd, flowName);
FlowCallOptions opts = Objects.requireNonNull(call.getOptions());
Map<String, Object> input = VMUtils.prepareInput(ee, ctx, opts.input(), opts.inputExpression());
// the call's frame should be a "root" frame
// all local variables will have this frame as their base
Frame innerFrame = Frame.builder().root().commands(steps).locals(input).build();
// an "out" handler:
// grab the out variable from the called flow's frame
// and put it into the callee's frame
Command processOutVars;
if (!opts.outExpr().isEmpty()) {
processOutVars = new EvalVariablesCommand(ctx, opts.outExpr(), innerFrame);
} else {
processOutVars = new CopyVariablesCommand(opts.out(), innerFrame, VMUtils::assertNearestRoot);
}
// push the out handler first so it executes after the called flow's frame is done
state.peekFrame(threadId).push(processOutVars);
state.pushFrame(threadId, innerFrame);
}
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