def main(self, handlers):
"""
This is the main handler.
It prepares the ExecGraph, ContextStack and Reporter.
TargetResolver.run is where the actual targets are executed.
"""
assert handlers, "Need at least one static target to bootstrap"
execution_graph = ExecGraph(handlers)
stack = ContextStack()
reporter = Reporter()
self.run(execution_graph, stack, reporter)
reporter.flush()
