| /* |
| * 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.fn.windowing; |
| |
| import com.google.auto.value.AutoValue; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import org.apache.beam.sdk.coders.AtomicCoder; |
| import org.apache.beam.sdk.coders.CoderException; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.apache.beam.sdk.util.VarInt; |
| import org.apache.beam.vendor.grpc.v1p21p0.com.google.protobuf.ByteString; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.io.ByteStreams; |
| import org.joda.time.Instant; |
| |
| /** |
| * An encoded {@link BoundedWindow} used within Runners to track window information without needing |
| * to decode the window. |
| * |
| * <p>This allows for Runners to not need to know window format during execution. |
| */ |
| @AutoValue |
| public abstract class EncodedBoundedWindow extends BoundedWindow { |
| public static EncodedBoundedWindow forEncoding(ByteString encodedWindow) { |
| return new AutoValue_EncodedBoundedWindow(encodedWindow); |
| } |
| |
| public abstract ByteString getEncodedWindow(); |
| |
| @Override |
| public Instant maxTimestamp() { |
| throw new UnsupportedOperationException( |
| "TODO: Add support for reading the timestamp from " + "the encoded window."); |
| } |
| |
| /** |
| * An {@link Coder} for {@link EncodedBoundedWindow}s. |
| * |
| * <p>This is a copy of {@code ByteStringCoder} to prevent a dependency on {@code |
| * beam-java-sdk-extensions-protobuf}. |
| */ |
| public static class Coder extends AtomicCoder<EncodedBoundedWindow> { |
| public static final Coder INSTANCE = new Coder(); |
| |
| // prevent instantiation |
| private Coder() {} |
| |
| @Override |
| public void encode(EncodedBoundedWindow value, OutputStream outStream) |
| throws CoderException, IOException { |
| VarInt.encode(value.getEncodedWindow().size(), outStream); |
| value.getEncodedWindow().writeTo(outStream); |
| } |
| |
| @Override |
| public EncodedBoundedWindow decode(InputStream inStream) throws CoderException, IOException { |
| int size = VarInt.decodeInt(inStream); |
| ByteString encodedWindow = ByteString.readFrom(ByteStreams.limit(inStream, size)); |
| return EncodedBoundedWindow.forEncoding(encodedWindow); |
| } |
| |
| @Override |
| public boolean consistentWithEquals() { |
| return true; |
| } |
| |
| @Override |
| public boolean isRegisterByteSizeObserverCheap(EncodedBoundedWindow value) { |
| return true; |
| } |
| |
| @Override |
| protected long getEncodedElementByteSize(EncodedBoundedWindow value) throws Exception { |
| return (long) VarInt.getLength(value.getEncodedWindow().size()) |
| + value.getEncodedWindow().size(); |
| } |
| } |
| } |