/** * 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.RaftPeerId; import org.apache.ratis.server.protocol.TermIndex; import org.apache.ratis.statemachine.StateMachine; import org.apache.ratis.util.IOUtils; import org.apache.ratis.util.JavaUtils; import java.io.IOException; /** Server utilities for internal use. */ public class ServerImplUtils { /** For the case that all {@link RaftServerImpl} objects share the same {@link StateMachine}. */ public static RaftServerProxy newRaftServer( RaftPeerId id, RaftGroup group, StateMachine.Registry stateMachineRegistry, RaftProperties properties, Parameters parameters) throws IOException { RaftServerProxy.LOG.debug("newRaftServer: {}, {}", id, group); final RaftServerProxy proxy = newRaftServer(id, stateMachineRegistry, properties, parameters); proxy.initGroups(group); return proxy; } private static RaftServerProxy newRaftServer( RaftPeerId id, StateMachine.Registry stateMachineRegistry, RaftProperties properties, Parameters parameters) throws IOException { final RaftServerProxy proxy; try { // attempt multiple times to avoid temporary bind exception proxy = JavaUtils.attempt( () -> new RaftServerProxy(id, stateMachineRegistry, properties, parameters), 5, 500L, "new RaftServerProxy", RaftServerProxy.LOG); } catch (InterruptedException e) { throw IOUtils.toInterruptedIOException( "Interrupted when creating RaftServer " + id, e); } return proxy; } public static TermIndex newTermIndex(long term, long index) { return new TermIndexImpl(term, index); } private static class TermIndexImpl implements TermIndex { private final long term; private final long index; //log index; first index is 1. TermIndexImpl(long term, long logIndex) { this.term = term; this.index = logIndex; } @Override public long getTerm() { return term; } @Override public long getIndex() { return index; } @Override public int compareTo(TermIndex that) { final int d = Long.compare(this.getTerm(), that.getTerm()); return d != 0 ? d : Long.compare(this.getIndex(), that.getIndex()); } @Override public boolean equals(Object obj) { if (obj == this) { return true; } else if (obj == null || !(obj instanceof TermIndexImpl)) { return false; } final TermIndexImpl that = (TermIndexImpl) obj; return this.getTerm() == that.getTerm() && this.getIndex() == that.getIndex(); } @Override public int hashCode() { return Long.hashCode(term) ^ Long.hashCode(index); } @Override public String toString() { return TermIndex.toString(term, index); } } }