| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.meta; |
| |
| import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.AlgebricksPipeline; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IPushRuntime; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.context.RuntimeContext; |
| import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.api.comm.IFrameWriter; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| |
| public class PipelineAssembler { |
| |
| // array of factories for building the local runtime pipeline |
| private final RecordDescriptor pipelineInputRecordDescriptor; |
| private final RecordDescriptor pipelineOutputRecordDescriptor; |
| |
| private final int inputArity; |
| private final int outputArity; |
| private final AlgebricksPipeline pipeline; |
| |
| public PipelineAssembler(AlgebricksPipeline pipeline, int inputArity, int outputArity, |
| RecordDescriptor pipelineInputRecordDescriptor, RecordDescriptor pipelineOutputRecordDescriptor) { |
| this.pipeline = pipeline; |
| this.pipelineInputRecordDescriptor = pipelineInputRecordDescriptor; |
| this.pipelineOutputRecordDescriptor = pipelineOutputRecordDescriptor; |
| this.inputArity = inputArity; |
| this.outputArity = outputArity; |
| } |
| |
| public IFrameWriter assemblePipeline(IFrameWriter writer, RuntimeContext rc) throws AlgebricksException { |
| // plug the operators |
| IFrameWriter start = writer;// this.writer; |
| for (int i = pipeline.getRuntimeFactories().length - 1; i >= 0; i--) { |
| IPushRuntime newRuntime = pipeline.getRuntimeFactories()[i].createPushRuntime(rc); |
| if (i == pipeline.getRuntimeFactories().length - 1) { |
| if (outputArity == 1) { |
| newRuntime.setFrameWriter(0, start, pipelineOutputRecordDescriptor); |
| } |
| } else { |
| newRuntime.setFrameWriter(0, start, pipeline.getRecordDescriptors()[i]); |
| } |
| if (i > 0) { |
| newRuntime.setInputRecordDescriptor(0, pipeline.getRecordDescriptors()[i - 1]); |
| } else if (inputArity > 0) { |
| newRuntime.setInputRecordDescriptor(0, pipelineInputRecordDescriptor); |
| } |
| start = newRuntime; |
| } |
| return start; |
| } |
| } |