| /* |
| * 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.ratis.server.metrics; |
| |
| import org.apache.ratis.metrics.MetricRegistryInfo; |
| import org.apache.ratis.metrics.RatisMetricRegistry; |
| import org.apache.ratis.metrics.RatisMetrics; |
| import org.apache.ratis.protocol.RaftGroupMemberId; |
| import org.apache.ratis.util.Timestamp; |
| |
| import com.codahale.metrics.Timer; |
| |
| import java.util.Optional; |
| import java.util.function.LongSupplier; |
| |
| /** |
| * Class to update the metrics related to Leader Election. |
| */ |
| public final class LeaderElectionMetrics extends RatisMetrics { |
| |
| public static final String RATIS_LEADER_ELECTION_METRICS = "leader_election"; |
| public static final String RATIS_LEADER_ELECTION_METRICS_DESC = "Metrics for Ratis Leader Election."; |
| |
| public static final String LEADER_ELECTION_COUNT_METRIC = "electionCount"; |
| public static final String LEADER_ELECTION_TIMEOUT_COUNT_METRIC = "timeoutCount"; |
| public static final String LEADER_ELECTION_TIME_TAKEN = "electionTime"; |
| public static final String LAST_LEADER_ELAPSED_TIME = "lastLeaderElapsedTime"; |
| |
| public static final String LAST_LEADER_ELECTION_ELAPSED_TIME = |
| "lastLeaderElectionElapsedTime"; |
| private volatile Timestamp lastElectionTime; |
| |
| private LeaderElectionMetrics(RaftGroupMemberId serverId, LongSupplier getLastLeaderElapsedTimeMs) { |
| this.registry = getMetricRegistryForLeaderElection(serverId); |
| registry.gauge(LAST_LEADER_ELAPSED_TIME, () -> getLastLeaderElapsedTimeMs::getAsLong); |
| registry.gauge(LAST_LEADER_ELECTION_ELAPSED_TIME, |
| () -> () -> Optional.ofNullable(lastElectionTime).map(Timestamp::elapsedTimeMs).orElse(-1L)); |
| } |
| |
| public static RatisMetricRegistry getMetricRegistryForLeaderElection(RaftGroupMemberId serverId) { |
| return create(new MetricRegistryInfo(serverId.toString(), |
| RATIS_APPLICATION_NAME_METRICS, RATIS_LEADER_ELECTION_METRICS, |
| RATIS_LEADER_ELECTION_METRICS_DESC)); |
| } |
| |
| public static LeaderElectionMetrics getLeaderElectionMetrics( |
| RaftGroupMemberId serverId, LongSupplier getLastLeaderElapsedTimeMs) { |
| return new LeaderElectionMetrics(serverId, getLastLeaderElapsedTimeMs); |
| } |
| |
| public void onNewLeaderElectionCompletion() { |
| registry.counter(LEADER_ELECTION_COUNT_METRIC).inc(); |
| lastElectionTime = Timestamp.currentTime(); |
| } |
| |
| public Timer getLeaderElectionTimer() { |
| return registry.timer(LEADER_ELECTION_TIME_TAKEN); |
| } |
| |
| public void onLeaderElectionTimeout() { |
| registry.counter(LEADER_ELECTION_TIMEOUT_COUNT_METRIC).inc(); |
| } |
| } |