| /* |
| * 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.nexmark.sources.generator; |
| |
| import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.MoreObjects.toStringHelper; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.CoderException; |
| import org.apache.beam.sdk.coders.CustomCoder; |
| import org.apache.beam.sdk.coders.VarLongCoder; |
| import org.apache.beam.sdk.io.UnboundedSource; |
| |
| /** Just enough state to be able to restore a generator back to where it was checkpointed. */ |
| public class GeneratorCheckpoint implements UnboundedSource.CheckpointMark { |
| private static final Coder<Long> LONG_CODER = VarLongCoder.of(); |
| |
| /** Coder for this class. */ |
| public static final Coder<GeneratorCheckpoint> CODER_INSTANCE = |
| new CustomCoder<GeneratorCheckpoint>() { |
| @Override |
| public void encode(GeneratorCheckpoint value, OutputStream outStream) |
| throws CoderException, IOException { |
| LONG_CODER.encode(value.numEvents, outStream); |
| LONG_CODER.encode(value.wallclockBaseTime, outStream); |
| } |
| |
| @Override |
| public GeneratorCheckpoint decode(InputStream inStream) throws CoderException, IOException { |
| long numEvents = LONG_CODER.decode(inStream); |
| long wallclockBaseTime = LONG_CODER.decode(inStream); |
| return new GeneratorCheckpoint(numEvents, wallclockBaseTime); |
| } |
| |
| @Override |
| public void verifyDeterministic() throws NonDeterministicException {} |
| }; |
| |
| private final long numEvents; |
| private final long wallclockBaseTime; |
| |
| GeneratorCheckpoint(long numEvents, long wallclockBaseTime) { |
| this.numEvents = numEvents; |
| this.wallclockBaseTime = wallclockBaseTime; |
| } |
| |
| public Generator toGenerator(GeneratorConfig config) { |
| return new Generator(config, numEvents, wallclockBaseTime); |
| } |
| |
| @Override |
| public void finalizeCheckpoint() throws IOException { |
| // Nothing to finalize. |
| } |
| |
| @Override |
| public String toString() { |
| return toStringHelper(this) |
| .add("numEvents", numEvents) |
| .add("wallclockBaseTime", wallclockBaseTime) |
| .toString(); |
| } |
| } |