| /* |
| * 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 java.util.Collection; |
| import java.util.Collections; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import com.codahale.metrics.Gauge; |
| import com.codahale.metrics.Meter; |
| import org.apache.cassandra.transport.Server; |
| |
| import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics; |
| |
| |
| public class ClientMetrics |
| { |
| private static final MetricNameFactory factory = new DefaultNameFactory("Client"); |
| public static final ClientMetrics instance = new ClientMetrics(); |
| |
| private volatile boolean initialized = false; |
| |
| private Collection<Server> servers = Collections.emptyList(); |
| |
| private AtomicInteger pausedConnections; |
| private Gauge<Integer> pausedConnectionsGauge; |
| private Meter requestDiscarded; |
| |
| private ClientMetrics() |
| { |
| } |
| |
| public void pauseConnection() { pausedConnections.incrementAndGet(); } |
| public void unpauseConnection() { pausedConnections.decrementAndGet(); } |
| public void markRequestDiscarded() { requestDiscarded.mark(); } |
| |
| public synchronized void init(Collection<Server> servers) |
| { |
| if (initialized) |
| return; |
| |
| this.servers = servers; |
| |
| registerGauge("connectedNativeClients", this::countConnectedClients); |
| |
| pausedConnections = new AtomicInteger(); |
| pausedConnectionsGauge = registerGauge("PausedConnections", pausedConnections::get); |
| requestDiscarded = registerMeter("RequestDiscarded"); |
| |
| initialized = true; |
| } |
| |
| public void addCounter(String name, final Callable<Integer> provider) |
| { |
| Metrics.register(factory.createMetricName(name), new Gauge<Integer>() |
| { |
| public Integer getValue() |
| { |
| try |
| { |
| return provider.call(); |
| } catch (Exception e) |
| { |
| throw new RuntimeException(e); |
| } |
| } |
| }); |
| } |
| |
| private int countConnectedClients() |
| { |
| int count = 0; |
| |
| for (Server server : servers) |
| count += server.getConnectedClients(); |
| |
| return count; |
| } |
| |
| private <T> Gauge<T> registerGauge(String name, Gauge<T> gauge) |
| { |
| return Metrics.register(factory.createMetricName(name), gauge); |
| } |
| |
| private Meter registerMeter(String name) |
| { |
| return Metrics.meter(factory.createMetricName(name)); |
| } |
| } |