| /* |
| * 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.gms; |
| |
| import java.io.*; |
| import java.util.Collections; |
| import java.util.EnumMap; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.cassandra.db.TypeSizes; |
| import org.apache.cassandra.io.IVersionedSerializer; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| /** |
| * This abstraction represents both the HeartBeatState and the ApplicationState in an EndpointState |
| * instance. Any state for a given endpoint can be retrieved from this instance. |
| */ |
| |
| |
| public class EndpointState |
| { |
| protected static final Logger logger = LoggerFactory.getLogger(EndpointState.class); |
| |
| public final static IVersionedSerializer<EndpointState> serializer = new EndpointStateSerializer(); |
| |
| private volatile HeartBeatState hbState; |
| private final AtomicReference<Map<ApplicationState, VersionedValue>> applicationState; |
| |
| /* fields below do not get serialized */ |
| private volatile long updateTimestamp; |
| private volatile boolean isAlive; |
| |
| EndpointState(HeartBeatState initialHbState) |
| { |
| this(initialHbState, new EnumMap<ApplicationState, VersionedValue>(ApplicationState.class)); |
| } |
| |
| EndpointState(HeartBeatState initialHbState, Map<ApplicationState, VersionedValue> states) |
| { |
| hbState = initialHbState; |
| applicationState = new AtomicReference<Map<ApplicationState, VersionedValue>>(new EnumMap<>(states)); |
| updateTimestamp = System.nanoTime(); |
| isAlive = true; |
| } |
| |
| HeartBeatState getHeartBeatState() |
| { |
| return hbState; |
| } |
| |
| void setHeartBeatState(HeartBeatState newHbState) |
| { |
| updateTimestamp(); |
| hbState = newHbState; |
| } |
| |
| public VersionedValue getApplicationState(ApplicationState key) |
| { |
| return applicationState.get().get(key); |
| } |
| |
| public Set<Map.Entry<ApplicationState, VersionedValue>> states() |
| { |
| return applicationState.get().entrySet(); |
| } |
| |
| public void addApplicationState(ApplicationState key, VersionedValue value) |
| { |
| addApplicationStates(Collections.singletonMap(key, value)); |
| } |
| |
| public void addApplicationStates(Map<ApplicationState, VersionedValue> values) |
| { |
| addApplicationStates(values.entrySet()); |
| } |
| |
| public void addApplicationStates(Set<Map.Entry<ApplicationState, VersionedValue>> values) |
| { |
| while (true) |
| { |
| Map<ApplicationState, VersionedValue> orig = applicationState.get(); |
| Map<ApplicationState, VersionedValue> copy = new EnumMap<>(orig); |
| |
| for (Map.Entry<ApplicationState, VersionedValue> value : values) |
| copy.put(value.getKey(), value.getValue()); |
| |
| if (applicationState.compareAndSet(orig, copy)) |
| return; |
| } |
| } |
| |
| /* getters and setters */ |
| /** |
| * @return System.nanoTime() when state was updated last time. |
| */ |
| public long getUpdateTimestamp() |
| { |
| return updateTimestamp; |
| } |
| |
| void updateTimestamp() |
| { |
| updateTimestamp = System.nanoTime(); |
| } |
| |
| public boolean isAlive() |
| { |
| return isAlive; |
| } |
| |
| void markAlive() |
| { |
| isAlive = true; |
| } |
| |
| void markDead() |
| { |
| isAlive = false; |
| } |
| |
| public boolean isRpcReady() |
| { |
| VersionedValue rpcState = getApplicationState(ApplicationState.RPC_READY); |
| return rpcState != null && Boolean.parseBoolean(rpcState.value); |
| } |
| |
| public String getStatus() |
| { |
| VersionedValue status = getApplicationState(ApplicationState.STATUS); |
| if (status == null) |
| return ""; |
| |
| String[] pieces = status.value.split(VersionedValue.DELIMITER_STR, -1); |
| assert (pieces.length > 0); |
| return pieces[0]; |
| } |
| |
| public String toString() |
| { |
| return "EndpointState: HeartBeatState = " + hbState + ", AppStateMap = " + applicationState.get(); |
| } |
| } |
| |
| class EndpointStateSerializer implements IVersionedSerializer<EndpointState> |
| { |
| public void serialize(EndpointState epState, DataOutputPlus out, int version) throws IOException |
| { |
| /* serialize the HeartBeatState */ |
| HeartBeatState hbState = epState.getHeartBeatState(); |
| HeartBeatState.serializer.serialize(hbState, out, version); |
| |
| /* serialize the map of ApplicationState objects */ |
| Set<Map.Entry<ApplicationState, VersionedValue>> states = epState.states(); |
| out.writeInt(states.size()); |
| for (Map.Entry<ApplicationState, VersionedValue> state : states) |
| { |
| VersionedValue value = state.getValue(); |
| out.writeInt(state.getKey().ordinal()); |
| VersionedValue.serializer.serialize(value, out, version); |
| } |
| } |
| |
| public EndpointState deserialize(DataInputPlus in, int version) throws IOException |
| { |
| HeartBeatState hbState = HeartBeatState.serializer.deserialize(in, version); |
| |
| int appStateSize = in.readInt(); |
| Map<ApplicationState, VersionedValue> states = new EnumMap<>(ApplicationState.class); |
| for (int i = 0; i < appStateSize; ++i) |
| { |
| int key = in.readInt(); |
| VersionedValue value = VersionedValue.serializer.deserialize(in, version); |
| states.put(Gossiper.STATES[key], value); |
| } |
| |
| return new EndpointState(hbState, states); |
| } |
| |
| public long serializedSize(EndpointState epState, int version) |
| { |
| long size = HeartBeatState.serializer.serializedSize(epState.getHeartBeatState(), version); |
| Set<Map.Entry<ApplicationState, VersionedValue>> states = epState.states(); |
| size += TypeSizes.sizeof(states.size()); |
| for (Map.Entry<ApplicationState, VersionedValue> state : states) |
| { |
| VersionedValue value = state.getValue(); |
| size += TypeSizes.sizeof(state.getKey().ordinal()); |
| size += VersionedValue.serializer.serializedSize(value, version); |
| } |
| return size; |
| } |
| } |