/* * Copyright 2015-present Open Networking Foundation * * Licensed 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 io.atomix.protocols.raft.storage.system; import io.atomix.protocols.raft.cluster.RaftMember; import io.atomix.utils.misc.TimestampPrinter; import java.util.Collection; import static com.google.common.base.MoreObjects.toStringHelper; import static com.google.common.base.Preconditions.checkArgument; import static com.google.common.base.Preconditions.checkNotNull; /** * Represents a persisted server configuration. */ public class Configuration { private final long index; private final long term; private final long time; private final Collection<RaftMember> members; public Configuration(long index, long term, long time, Collection<RaftMember> members) { checkArgument(time > 0, "time must be positive"); checkNotNull(members, "members cannot be null"); this.index = index; this.term = term; this.time = time; this.members = members; } /** * Returns the configuration index. * <p> * The index is the index of the {@link io.atomix.protocols.raft.storage.log.entry.ConfigurationEntry ConfigurationEntry} * which resulted in this configuration. * * @return The configuration index. */ public long index() { return index; } /** * Returns the configuration term. * <p> * The term is the term of the leader at the time the configuration change was committed. * * @return The configuration term. */ public long term() { return term; } /** * Returns the configuration time. * * @return The time at which the configuration was committed. */ public long time() { return time; } /** * Returns the cluster membership for this configuration. * * @return The cluster membership. */ public Collection<RaftMember> members() { return members; } @Override public String toString() { return toStringHelper(this) .add("index", index) .add("time", new TimestampPrinter(time)) .add("members", members) .toString(); } }