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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.net;
import java.io.IOException;
import java.net.InetAddress;
import java.util.Collections;
import java.util.Map;
import com.google.common.collect.ImmutableMap;
import org.apache.cassandra.concurrent.Stage;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.monitoring.ApproximateTime;
import org.apache.cassandra.exceptions.RequestFailureReason;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.util.DataInputBuffer;
import org.apache.cassandra.io.util.DataInputPlus;
public class MessageIn
{
public final InetAddress from;
public final T payload;
public final Map parameters;
public final MessagingService.Verb verb;
public final int version;
public final long constructionTime;
private MessageIn(InetAddress from,
T payload,
Map parameters,
MessagingService.Verb verb,
int version,
long constructionTime)
{
this.from = from;
this.payload = payload;
this.parameters = parameters;
this.verb = verb;
this.version = version;
this.constructionTime = constructionTime;
}
public static MessageIn create(InetAddress from,
T payload,
Map parameters,
MessagingService.Verb verb,
int version,
long constructionTime)
{
return new MessageIn<>(from, payload, parameters, verb, version, constructionTime);
}
public static MessageIn create(InetAddress from,
T payload,
Map parameters,
MessagingService.Verb verb,
int version)
{
return new MessageIn<>(from, payload, parameters, verb, version, ApproximateTime.currentTimeMillis());
}
public static MessageIn read(DataInputPlus in, int version, int id) throws IOException
{
return read(in, version, id, ApproximateTime.currentTimeMillis());
}
public static MessageIn read(DataInputPlus in, int version, int id, long constructionTime) throws IOException
{
InetAddress from = CompactEndpointSerializationHelper.deserialize(in);
MessagingService.Verb verb = MessagingService.verbValues[in.readInt()];
int parameterCount = in.readInt();
Map parameters;
if (parameterCount == 0)
{
parameters = Collections.emptyMap();
}
else
{
ImmutableMap.Builder builder = ImmutableMap.builder();
for (int i = 0; i < parameterCount; i++)
{
String key = in.readUTF();
byte[] value = new byte[in.readInt()];
in.readFully(value);
builder.put(key, value);
}
parameters = builder.build();
}
int payloadSize = in.readInt();
IVersionedSerializer serializer = (IVersionedSerializer) MessagingService.instance().verbSerializers.get(verb);
if (serializer instanceof MessagingService.CallbackDeterminedSerializer)
{
CallbackInfo callback = MessagingService.instance().getRegisteredCallback(id);
if (callback == null)
{
// reply for expired callback. we'll have to skip it.
in.skipBytesFully(payloadSize);
return null;
}
serializer = (IVersionedSerializer) callback.serializer;
}
if (payloadSize == 0 || serializer == null)
return create(from, null, parameters, verb, version, constructionTime);
T2 payload = serializer.deserialize(in, version);
return MessageIn.create(from, payload, parameters, verb, version, constructionTime);
}
public static long readConstructionTime(InetAddress from, DataInputPlus input, long currentTime) throws IOException
{
// Reconstruct the message construction time sent by the remote host (we sent only the lower 4 bytes, assuming the
// higher 4 bytes wouldn't change between the sender and receiver)
int partial = input.readInt(); // make sure to readInt, even if cross_node_to is not enabled
long sentConstructionTime = (currentTime & 0xFFFFFFFF00000000L) | (((partial & 0xFFFFFFFFL) << 2) >> 2);
// Because nodes may not have their clock perfectly in sync, it's actually possible the sentConstructionTime is
// later than the currentTime (the received time). If that's the case, as we definitively know there is a lack
// of proper synchronziation of the clock, we ignore sentConstructionTime. We also ignore that
// sentConstructionTime if we're told to.
long elapsed = currentTime - sentConstructionTime;
if (elapsed > 0)
MessagingService.instance().metrics.addTimeTaken(from, elapsed);
boolean useSentTime = DatabaseDescriptor.hasCrossNodeTimeout() && elapsed > 0;
return useSentTime ? sentConstructionTime : currentTime;
}
/**
* Since how long (in milliseconds) the message has lived.
*/
public long getLifetimeInMS()
{
return ApproximateTime.currentTimeMillis() - constructionTime;
}
/**
* Whether the message has crossed the node boundary, that is whether it originated from another node.
*
*/
public boolean isCrossNode()
{
return !from.equals(DatabaseDescriptor.getBroadcastAddress());
}
public Stage getMessageType()
{
return MessagingService.verbStages.get(verb);
}
public boolean doCallbackOnFailure()
{
return parameters.containsKey(MessagingService.FAILURE_CALLBACK_PARAM);
}
public boolean isFailureResponse()
{
return parameters.containsKey(MessagingService.FAILURE_RESPONSE_PARAM);
}
public boolean containsFailureReason()
{
return parameters.containsKey(MessagingService.FAILURE_REASON_PARAM);
}
public RequestFailureReason getFailureReason()
{
if (containsFailureReason())
{
try (DataInputBuffer in = new DataInputBuffer(parameters.get(MessagingService.FAILURE_REASON_PARAM)))
{
return RequestFailureReason.fromCode(in.readUnsignedShort());
}
catch (IOException ex)
{
throw new RuntimeException(ex);
}
}
else
{
return RequestFailureReason.UNKNOWN;
}
}
public long getTimeout()
{
return verb.getTimeout();
}
public long getSlowQueryTimeout()
{
return DatabaseDescriptor.getSlowQueryTimeout();
}
public String toString()
{
StringBuilder sbuf = new StringBuilder();
sbuf.append("FROM:").append(from).append(" TYPE:").append(getMessageType()).append(" VERB:").append(verb);
return sbuf.toString();
}
}