@Override public synchronized Serializable generate(AccessCallback callback) { final GenerationState generationState = locateGenerationState( callback.getTenantIdentifier() ); if ( generationState.lastSourceValue == null ) { // first call, so initialize ourselves. we need to read the database // value and set up the 'bucket' boundaries generationState.lastSourceValue = callback.getNextValue(); while ( generationState.lastSourceValue.lt( 1 ) ) { generationState.lastSourceValue = callback.getNextValue(); } // upperLimit defines the upper end of the bucket values generationState.upperLimit = generationState.lastSourceValue.copy().multiplyBy( incrementSize ).increment(); // initialize value to the low end of the bucket generationState.value = generationState.upperLimit.copy().subtract( incrementSize ); } else if ( ! generationState.upperLimit.gt( generationState.value ) ) { generationState.lastSourceValue = callback.getNextValue(); generationState.upperLimit = generationState.lastSourceValue.copy().multiplyBy( incrementSize ).increment(); generationState.value = generationState.upperLimit.copy().subtract( incrementSize ); } return generationState.value.makeValueThenIncrement(); }
@Override public synchronized Serializable generate(AccessCallback callback) { final GenerationState generationState = locateGenerationState( callback.getTenantIdentifier() ); if ( generationState.lastSourceValue == null ) { // first call, so initialize ourselves. we need to read the database // value and set up the 'bucket' boundaries generationState.lastSourceValue = callback.getNextValue(); while ( generationState.lastSourceValue.lt( 1 ) ) { generationState.lastSourceValue = callback.getNextValue(); } // upperLimit defines the upper end of the bucket values generationState.upperLimit = generationState.lastSourceValue.copy().multiplyBy( incrementSize ).increment(); // initialize value to the low end of the bucket generationState.value = generationState.upperLimit.copy().subtract( incrementSize ); } else if ( ! generationState.upperLimit.gt( generationState.value ) ) { generationState.lastSourceValue = callback.getNextValue(); generationState.upperLimit = generationState.lastSourceValue.copy().multiplyBy( incrementSize ).increment(); generationState.value = generationState.upperLimit.copy().subtract( incrementSize ); } return generationState.value.makeValueThenIncrement(); }