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f10a7d8fb0
This change enforces that IncrementableMetrics should only monotonically increase in value, and adds a new increment() method to increment by one, which is slightly faster than incrementBy (due to a lack of non-negative checking) in the common case that the counter should only be incremented by one. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=130578421
51 lines
2.1 KiB
Java
51 lines
2.1 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.monitoring.metrics;
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/**
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* A {@link Metric} which can be incremented.
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*
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* <p>This is a view into a {@link Counter} to provide compile-time checking to disallow arbitrarily
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* setting the metric, which is useful for metrics which should be monotonically increasing.
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*/
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public interface IncrementableMetric extends Metric<Long> {
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/**
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* Increments a metric by 1 for the given set of label values.
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*
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* Use this method rather than {@link IncrementableMetric#incrementBy(long, String...)} if the
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* increment value is zero, as it will be slightly more performant.
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*
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* <p>If the metric is undefined for given label values, it will be incremented from zero.
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*
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* <p>The metric's timestamp will be updated to the current time for the given label values.
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*
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* <p>The count of {@code labelValues} must be equal to the underlying metric's count of labels.
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*/
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void increment(String... labelValues);
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/**
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* Increments a metric by the given non-negative offset for the given set of label values.
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*
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* <p>If the metric is undefined for given label values, it will be incremented from zero.
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*
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* <p>The metric's timestamp will be updated to the current time for the given label values.
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*
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* <p>The count of {@code labelValues} must be equal to the underlying metric's count of labels.
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*
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* @throws IllegalArgumentException if the offset is negative.
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*/
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void incrementBy(long offset, String... labelValues);
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}
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