| /* |
| * 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.values; |
| |
| import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Objects; |
| import javax.annotation.Nullable; |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.beam.sdk.coders.InstantCoder; |
| import org.apache.beam.sdk.coders.StructuredCoder; |
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; |
| import org.joda.time.Instant; |
| |
| /** |
| * An immutable pair of a value and a timestamp. |
| * |
| * <p>The timestamp of a value determines many properties, such as its assignment to windows and |
| * whether the value is late (with respect to the watermark of a {@link PCollection}). |
| * |
| * @param <V> the type of the value |
| */ |
| public class TimestampedValue<V> { |
| /** |
| * Returns a new {@link TimestampedValue} with the {@link BoundedWindow#TIMESTAMP_MIN_VALUE |
| * minimum timestamp}. |
| */ |
| public static <V> TimestampedValue<V> atMinimumTimestamp(@Nullable V value) { |
| return of(value, BoundedWindow.TIMESTAMP_MIN_VALUE); |
| } |
| |
| /** Returns a new {@code TimestampedValue} with the given value and timestamp. */ |
| public static <V> TimestampedValue<V> of(@Nullable V value, Instant timestamp) { |
| return new TimestampedValue<>(value, timestamp); |
| } |
| |
| public V getValue() { |
| return value; |
| } |
| |
| public Instant getTimestamp() { |
| return timestamp; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (!(other instanceof TimestampedValue)) { |
| return false; |
| } |
| TimestampedValue<?> that = (TimestampedValue<?>) other; |
| return Objects.equals(value, that.value) && Objects.equals(timestamp, that.timestamp); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(value, timestamp); |
| } |
| |
| @Override |
| public String toString() { |
| return "TimestampedValue(" + value + ", " + timestamp + ")"; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| |
| /** A {@link Coder} for {@link TimestampedValue}. */ |
| public static class TimestampedValueCoder<T> extends StructuredCoder<TimestampedValue<T>> { |
| |
| private final Coder<T> valueCoder; |
| |
| public static <T> TimestampedValueCoder<T> of(Coder<T> valueCoder) { |
| return new TimestampedValueCoder<>(valueCoder); |
| } |
| |
| @Override |
| public Object structuralValue(TimestampedValue<T> value) { |
| Object structuralValue = valueCoder.structuralValue(value.getValue()); |
| return TimestampedValue.of(structuralValue, value.getTimestamp()); |
| } |
| |
| @SuppressWarnings("unchecked") |
| TimestampedValueCoder(Coder<T> valueCoder) { |
| this.valueCoder = checkNotNull(valueCoder); |
| } |
| |
| @Override |
| public void encode(TimestampedValue<T> windowedElem, OutputStream outStream) |
| throws IOException { |
| valueCoder.encode(windowedElem.getValue(), outStream); |
| InstantCoder.of().encode(windowedElem.getTimestamp(), outStream); |
| } |
| |
| @Override |
| public TimestampedValue<T> decode(InputStream inStream) throws IOException { |
| T value = valueCoder.decode(inStream); |
| Instant timestamp = InstantCoder.of().decode(inStream); |
| return TimestampedValue.of(value, timestamp); |
| } |
| |
| @Override |
| public void verifyDeterministic() throws NonDeterministicException { |
| verifyDeterministic( |
| this, "TimestampedValueCoder requires a deterministic valueCoder", valueCoder); |
| } |
| |
| @Override |
| public List<? extends Coder<?>> getCoderArguments() { |
| return Arrays.<Coder<?>>asList(valueCoder); |
| } |
| |
| public Coder<T> getValueCoder() { |
| return valueCoder; |
| } |
| |
| @Override |
| public TypeDescriptor<TimestampedValue<T>> getEncodedTypeDescriptor() { |
| return new TypeDescriptor<TimestampedValue<T>>() {}.where( |
| new TypeParameter<T>() {}, valueCoder.getEncodedTypeDescriptor()); |
| } |
| |
| @Override |
| public List<? extends Coder<?>> getComponents() { |
| return Collections.singletonList(valueCoder); |
| } |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| |
| private final @Nullable V value; |
| private final Instant timestamp; |
| |
| protected TimestampedValue(@Nullable V value, Instant timestamp) { |
| checkNotNull(timestamp, "timestamp must be non-null"); |
| |
| this.value = value; |
| this.timestamp = timestamp; |
| } |
| } |