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[FLINK-25470][changelog] Expose more metrics of ChangelogStateBackend…
… and materialization
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72 changes: 72 additions & 0 deletions
72
...cs/flink-metrics-core/src/main/java/org/apache/flink/metrics/ThreadSafeSimpleCounter.java
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| /* | ||
| * 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 | ||
| * | ||
| * https://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 org.apache.flink.metrics; | ||
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| import org.apache.flink.annotation.Internal; | ||
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| import java.util.concurrent.atomic.LongAdder; | ||
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| /** A simple low-overhead {@link org.apache.flink.metrics.Counter} that is thread-safe. */ | ||
| @Internal | ||
| public class ThreadSafeSimpleCounter implements Counter { | ||
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| /** the current count. */ | ||
| private final LongAdder longAdder = new LongAdder(); | ||
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| /** Increment the current count by 1. */ | ||
| @Override | ||
| public void inc() { | ||
| longAdder.increment(); | ||
| } | ||
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| /** | ||
| * Increment the current count by the given value. | ||
| * | ||
| * @param n value to increment the current count by | ||
| */ | ||
| @Override | ||
| public void inc(long n) { | ||
| longAdder.add(n); | ||
| } | ||
|
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| /** Decrement the current count by 1. */ | ||
| @Override | ||
| public void dec() { | ||
| longAdder.decrement(); | ||
| } | ||
|
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| /** | ||
| * Decrement the current count by the given value. | ||
| * | ||
| * @param n value to decrement the current count by | ||
| */ | ||
| @Override | ||
| public void dec(long n) { | ||
| longAdder.add(-n); | ||
| } | ||
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| /** | ||
| * Returns the current count. | ||
| * | ||
| * @return current count | ||
| */ | ||
| @Override | ||
| public long getCount() { | ||
| return longAdder.longValue(); | ||
| } | ||
| } |
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