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35 lines
1.4 KiB
Java
35 lines
1.4 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 re-setting
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* the metric, which is useful for metrics which should be monotonic.
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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 for a 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 first be set to 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 incrementBy(long offset, String... labelValues);
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}
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