| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 at |
| * |
| * 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 org.apache.hyracks.dataflow.std.sort; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.apache.hyracks.api.comm.IFrameWriter; |
| import org.apache.hyracks.api.exceptions.HyracksDataException; |
| import org.apache.hyracks.dataflow.common.io.GeneratedRunFileReader; |
| import org.apache.hyracks.dataflow.common.io.RunFileWriter; |
| |
| public abstract class AbstractSortRunGenerator implements IRunGenerator { |
| protected final List<GeneratedRunFileReader> generatedRunFileReaders; |
| |
| public AbstractSortRunGenerator() { |
| generatedRunFileReaders = new LinkedList<>(); |
| } |
| |
| abstract public ISorter getSorter() throws HyracksDataException; |
| |
| @Override |
| public void open() throws HyracksDataException { |
| generatedRunFileReaders.clear(); |
| } |
| |
| @Override |
| public void close() throws HyracksDataException { |
| if (getSorter().hasRemaining()) { |
| if (generatedRunFileReaders.size() <= 0) { |
| getSorter().sort(); |
| } else { |
| flushFramesToRun(); |
| } |
| } |
| } |
| |
| abstract protected RunFileWriter getRunFileWriter() throws HyracksDataException; |
| |
| abstract protected IFrameWriter getFlushableFrameWriter(RunFileWriter writer) throws HyracksDataException; |
| |
| protected void flushFramesToRun() throws HyracksDataException { |
| getSorter().sort(); |
| RunFileWriter runWriter = getRunFileWriter(); |
| IFrameWriter flushWriter = getFlushableFrameWriter(runWriter); |
| flushWriter.open(); |
| try { |
| getSorter().flush(flushWriter); |
| } finally { |
| flushWriter.close(); |
| } |
| generatedRunFileReaders.add(runWriter.createDeleteOnCloseReader()); |
| getSorter().reset(); |
| } |
| |
| @Override |
| public void fail() throws HyracksDataException { |
| } |
| |
| @Override |
| public List<GeneratedRunFileReader> getRuns() { |
| return generatedRunFileReaders; |
| } |
| } |