| /* |
| * 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.cassandra.metrics; |
| |
| import com.codahale.metrics.Gauge; |
| import com.codahale.metrics.Meter; |
| import org.apache.cassandra.utils.memory.BufferPool; |
| |
| import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics; |
| |
| public class BufferPoolMetrics |
| { |
| /** Total number of hits */ |
| public final Meter hits; |
| |
| /** Total number of misses */ |
| public final Meter misses; |
| |
| /** Total size of buffer pools, in bytes, including overflow allocation */ |
| public final Gauge<Long> size; |
| |
| /** Total size, in bytes, of active buffered being used from the pool currently + overflow */ |
| public final Gauge<Long> usedSize; |
| |
| /** |
| * Total size, in bytes, of direct or heap buffers allocated by the pool but not part of the pool |
| * either because they are too large to fit or because the pool has exceeded its maximum limit or because it's |
| * on-heap allocation. |
| */ |
| public final Gauge<Long> overflowSize; |
| |
| public BufferPoolMetrics(String scope, BufferPool bufferPool) |
| { |
| MetricNameFactory factory = new DefaultNameFactory("BufferPool", scope); |
| |
| hits = Metrics.meter(factory.createMetricName("Hits")); |
| |
| misses = Metrics.meter(factory.createMetricName("Misses")); |
| |
| overflowSize = Metrics.register(factory.createMetricName("OverflowSize"), bufferPool::overflowMemoryInBytes); |
| |
| usedSize = Metrics.register(factory.createMetricName("UsedSize"), bufferPool::usedSizeInBytes); |
| |
| size = Metrics.register(factory.createMetricName("Size"), bufferPool::sizeInBytes); |
| } |
| |
| /** |
| * used to register alias for 3.0/3.11 compatibility |
| */ |
| public void register3xAlias() |
| { |
| MetricNameFactory legacyFactory = new DefaultNameFactory("BufferPool"); |
| Metrics.registerMBean(misses, legacyFactory.createMetricName("Misses").getMBeanName()); |
| Metrics.registerMBean(size, legacyFactory.createMetricName("Size").getMBeanName()); |
| } |
| } |