paging/common/src/main/java/androidx/paging/DataSource.java
boolean dispatchInvalidResultIfInvalid() {
            if (mDataSource.isInvalid()) {
                dispatchResultToReceiver(PageResult.<T>getInvalidResult());
                return true;
            }
            return false;
        }
/**
         * Call before verifying args, or dispatching actul results
         *
         * @return true if DataSource was invalid, and invalid result dispatched
         */
Call before verifying args, or dispatching actul results
@return true if DataSource was invalid, and invalid result dispatched
Call before verifying args or dispatching actul results @return true if DataSource was invalid and invalid result dispatched
boolean dispatchInvalidResultIfInvalid() {
            if (mDataSource.isInvalid()) {
                dispatchResultToReceiver(PageResult.<T>getInvalidResult());
                return true;
            }
            return false;
        }
boolean dispatchInvalidResultIfInvalid ( ) { if ( mDataSource . isInvalid ( ) ) { dispatchResultToReceiver ( PageResult . < T > getInvalidResult ( ) ) ; return true ; } return false ; }
Call before verifying args, or dispatching actul results
 @return true if DataSource was invalid, and invalid result dispatched
Call before verifying args or dispatching actul results @return true if DataSource was invalid and invalid result dispatched