question: starts this operation 's execution . called after all successsor consuming operations have been started . concode_field_sep int finishState concode_elem_sep InitializationState initializationState concode_elem_sep Object initializationStateLock concode_elem_sep OutputReceiver[] receivers concode_elem_sep int processState concode_elem_sep StateSampler stateSampler concode_elem_sep int startState concode_field_sep void checkStarted concode_elem_sep boolean supportsRestart concode_elem_sep void finish concode_elem_sep boolean isFinished concode_elem_sep void checkUnstarted concode_elem_sep void checkFinished
target: void function ( ) { synchronized ( initializationStateLock ) { checkUnstarted ( ) ; initializationState = InitializationState . STARTED ; } }