| /* |
| * 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.beam.sdk.extensions.sorter; |
| |
| import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkState; |
| |
| import java.io.IOException; |
| import java.nio.file.Paths; |
| import org.apache.beam.sdk.values.KV; |
| |
| /** Does an external sort of the provided values. */ |
| class NativeExternalSorter extends ExternalSorter { |
| |
| /** Whether {@link #sort()} was already called. */ |
| private boolean sortCalled = false; |
| |
| /** Sorter used to sort the input. */ |
| private NativeFileSorter sorter; |
| |
| private boolean initialized = false; |
| |
| /** Returns a {@link Sorter} configured with the given {@link Options}. */ |
| public static NativeExternalSorter create(Options options) { |
| return new NativeExternalSorter(options); |
| } |
| |
| @Override |
| public void add(KV<byte[], byte[]> record) throws IOException { |
| checkState(!sortCalled, "Records can only be added before sort()"); |
| |
| initSorter(); |
| |
| sorter.add(record.getKey(), record.getValue()); |
| } |
| |
| @Override |
| public Iterable<KV<byte[], byte[]>> sort() throws IOException { |
| checkState(!sortCalled, "sort() can only be called once."); |
| sortCalled = true; |
| |
| initSorter(); |
| |
| return sorter.sort(); |
| } |
| |
| private NativeExternalSorter(Options options) { |
| super(options); |
| } |
| |
| /** |
| * Initializes the sorter. Does some local file system setup, and is somewhat expensive (~20 ms on |
| * local machine). Only executed when necessary. |
| */ |
| private void initSorter() throws IOException { |
| if (!initialized) { |
| sorter = |
| new NativeFileSorter( |
| Paths.get(options.getTempLocation()), (long) options.getMemoryMB() * 1024 * 1024); |
| initialized = true; |
| } |
| } |
| } |