NOTE: although it is possible to apply the helper to any
SyncManagedExectuables it is not recommended since the sync functions will
intoduce unnecessary overhead

Example:

void startSystem(AsyncManagedExecutable a, AsyncManagedExecutable b, AsyncManagedExecutable c) throws SomeException {
try {
// start a and b
ExecStateFuture aStartFuture = AsyncExecHelper.start(a);
ExecStateFuture bStartFuture = AsyncExecHelper.start(b);

// wait for a and b to finish starting before starting c
ExecState aStartResult = aStartFuture.get();
if(!ExecState.RUNNING.equals(aStartResult)) {
throw new SomeException(ce);
}

ExecState aStartResult = aStartFuture.get();
if(!ExecState.RUNNING.equals(aStartResult)) {
throw new SomeException(ce);
}

// start c
ExecStateFuture cStartFuture = AsyncExecHelper.start(c);

// wait for c to finish starting before returning
cStartFuture.get();
ExecState cStartResult = cStartFuture.get();
if(!ExecState.RUNNING.equals(cStartResult)) {
throw new SomeException(ce);
}

} catch(CancellationException ce) {
throw new SomeException(ce);
} catch(InvalidStateException ise) {
throw new SomeException(ise);
} catch(ExecutableException exee) {
throw new SomeException(exee);
} catch(ExecutionException exe) {
throw new SomeException(exe);
}
}