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/*
* 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.UUID;
import java.util.concurrent.atomic.AtomicReference;
import javax.annotation.Nullable;
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;
import org.apache.cassandra.utils.CassandraVersion;
/**
* 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];
}
@Nullable
public UUID getSchemaVersion()
{
VersionedValue applicationState = getApplicationState(ApplicationState.SCHEMA);
return applicationState != null
? UUID.fromString(applicationState.value)
: null;
}
@Nullable
public CassandraVersion getReleaseVersion()
{
VersionedValue applicationState = getApplicationState(ApplicationState.RELEASE_VERSION);
return applicationState != null
? new CassandraVersion(applicationState.value)
: null;
}
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;
}
}