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fix(598): Change timestamp resolution to support nanos
Fix #598 Changing timestamp type to java.time.Instant to support nanosec resolution. Keeping current get/set methods to operate with milliseconds. Updating unit tests to reflect type change and additional API.
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google-cloud-logging/src/main/java/com/google/cloud/logging/JavaTimeConversions.java
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/* | ||
* Copyright 2021 Google LLC | ||
* | ||
* Licensed 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. | ||
*/ | ||
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package com.google.cloud.logging; | ||
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import static com.google.common.math.LongMath.checkedAdd; | ||
import static com.google.common.math.LongMath.checkedSubtract; | ||
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import com.google.protobuf.Timestamp; | ||
import com.google.protobuf.util.Timestamps; | ||
import java.time.Instant; | ||
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/** | ||
* A utility class that provides conversions between: | ||
* | ||
* <ul> | ||
* <li>Protobuf's {@link Timestamp} and {@link java.time.Instant} | ||
* </ul> | ||
* | ||
* The class complements convertion methods that are currently not supported in the published | ||
* protobuf-java-util. After migrating protobuf-java-util to Java 8 this class can be removed. | ||
* | ||
* @see <a | ||
* href="https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java-util">protobuf-java-util</a> | ||
*/ | ||
class JavaTimeConversions { | ||
static final long NANOS_PER_SECOND = 1000000000; | ||
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private JavaTimeConversions() {} | ||
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/** | ||
* Converts a protobuf {@link Timestamp} to a {@link java.time.Instant}. | ||
* | ||
* @throws IllegalArgumentException if the given {@link Timestamp} is not valid. See {@link | ||
* Timestamps#isValid}. | ||
*/ | ||
public static Instant toJavaInstant(Timestamp timestamp) { | ||
timestamp = normalizedTimestamp(timestamp.getSeconds(), timestamp.getNanos()); | ||
return Instant.ofEpochSecond(timestamp.getSeconds(), timestamp.getNanos()); | ||
} | ||
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/** | ||
* Converts a {@link java.time.Instant} to a protobuf {@link Timestamp}. | ||
* | ||
* @throws IllegalArgumentException if the given {@link java.time.Instant} cannot legally fit into | ||
* a {@link Timestamp}. See {@link Timestamps#isValid}. | ||
*/ | ||
public static Timestamp toProtoTimestamp(Instant instant) { | ||
return normalizedTimestamp(instant.getEpochSecond(), instant.getNano()); | ||
} | ||
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/** | ||
* Exposes {@link Timestamps#normalizedTimestamp} internal method. | ||
*/ | ||
static Timestamp normalizedTimestamp(long seconds, int nanos) { | ||
if (nanos <= -NANOS_PER_SECOND || nanos >= NANOS_PER_SECOND) { | ||
seconds = checkedAdd(seconds, nanos / NANOS_PER_SECOND); | ||
nanos = (int) (nanos % NANOS_PER_SECOND); | ||
} | ||
if (nanos < 0) { | ||
nanos = | ||
(int) | ||
(nanos + NANOS_PER_SECOND); // no overflow since nanos is negative (and we're adding) | ||
seconds = checkedSubtract(seconds, 1); | ||
} | ||
Timestamp timestamp = Timestamp.newBuilder().setSeconds(seconds).setNanos(nanos).build(); | ||
return Timestamps.checkValid(timestamp); | ||
} | ||
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} |
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