| /* |
| * 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.impl; |
| |
| import org.apache.ratis.conf.Parameters; |
| import org.apache.ratis.conf.RaftProperties; |
| import org.apache.ratis.protocol.RaftGroup; |
| import org.apache.ratis.protocol.RaftPeer; |
| import org.apache.ratis.protocol.RaftPeerId; |
| import org.apache.ratis.server.RaftConfiguration; |
| import org.apache.ratis.server.RaftServer; |
| import org.apache.ratis.server.protocol.TermIndex; |
| import org.apache.ratis.server.raftlog.RaftLog; |
| import org.apache.ratis.server.storage.RaftStorage; |
| import org.apache.ratis.statemachine.StateMachine; |
| import org.apache.ratis.util.IOUtils; |
| import org.apache.ratis.util.JavaUtils; |
| import org.apache.ratis.util.Preconditions; |
| import org.apache.ratis.util.TimeDuration; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.concurrent.TimeUnit; |
| |
| /** Server utilities for internal use. */ |
| public final class ServerImplUtils { |
| private ServerImplUtils() { |
| //Never constructed |
| } |
| |
| /** Create a {@link RaftServerProxy}. */ |
| public static RaftServerProxy newRaftServer( |
| RaftPeerId id, RaftGroup group, RaftStorage.StartupOption option, StateMachine.Registry stateMachineRegistry, |
| ThreadGroup threadGroup, RaftProperties properties, Parameters parameters) throws IOException { |
| RaftServer.LOG.debug("newRaftServer: {}, {}", id, group); |
| if (group != null && !group.getPeers().isEmpty()) { |
| Preconditions.assertNotNull(id, "RaftPeerId %s is not in RaftGroup %s", id, group); |
| Preconditions.assertNotNull(group.getPeer(id), "RaftPeerId %s is not in RaftGroup %s", id, group); |
| } |
| final RaftServerProxy proxy = newRaftServer(id, stateMachineRegistry, threadGroup, properties, parameters); |
| proxy.initGroups(group, option); |
| return proxy; |
| } |
| |
| private static RaftServerProxy newRaftServer( |
| RaftPeerId id, StateMachine.Registry stateMachineRegistry, ThreadGroup threadGroup, RaftProperties properties, |
| Parameters parameters) throws IOException { |
| final TimeDuration sleepTime = TimeDuration.valueOf(500, TimeUnit.MILLISECONDS); |
| final RaftServerProxy proxy; |
| try { |
| // attempt multiple times to avoid temporary bind exception |
| proxy = JavaUtils.attemptRepeatedly( |
| () -> new RaftServerProxy(id, stateMachineRegistry, properties, parameters, threadGroup), |
| 5, sleepTime, "new RaftServerProxy", RaftServer.LOG); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| throw IOUtils.toInterruptedIOException( |
| "Interrupted when creating RaftServer " + id, e); |
| } |
| return proxy; |
| } |
| |
| public static RaftConfiguration newRaftConfiguration(List<RaftPeer> conf, List<RaftPeer> listener, |
| long index, List<RaftPeer> oldConf, List<RaftPeer> oldListener) { |
| final RaftConfigurationImpl.Builder b = RaftConfigurationImpl.newBuilder() |
| .setConf(conf, listener) |
| .setLogEntryIndex(index); |
| if (!oldConf.isEmpty() || !oldListener.isEmpty()) { |
| b.setOldConf(oldConf, oldListener); |
| } |
| return b.build(); |
| } |
| |
| static long effectiveCommitIndex(long leaderCommitIndex, TermIndex followerPrevious, int numAppendEntries) { |
| final long p = Optional.ofNullable(followerPrevious).map(TermIndex::getIndex).orElse(RaftLog.LEAST_VALID_LOG_INDEX); |
| return Math.min(leaderCommitIndex, p + numAppendEntries); |
| } |
| } |