/*
* 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.tracing;
import java.net.InetAddress;
import java.nio.ByteBuffer;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import com.google.common.base.Stopwatch;
import org.slf4j.helpers.MessageFormatter;
import org.apache.cassandra.concurrent.Stage;
import org.apache.cassandra.concurrent.StageManager;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.db.ArrayBackedSortedColumns;
import org.apache.cassandra.db.ColumnFamily;
import org.apache.cassandra.db.Mutation;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.UUIDGen;
import org.apache.cassandra.utils.WrappedRunnable;
/**
* ThreadLocal state for a tracing session. The presence of an instance of this class as a ThreadLocal denotes that an
* operation is being traced.
*/
public class TraceState
{
public final UUID sessionId;
public final InetAddress coordinator;
public final Stopwatch watch;
public final ByteBuffer sessionIdBytes;
// Multiple requests can use the same TraceState at a time, so we need to reference count.
// See CASSANDRA-7626 for more details.
private final AtomicInteger references = new AtomicInteger(1);
public TraceState(InetAddress coordinator, UUID sessionId)
{
assert coordinator != null;
assert sessionId != null;
this.coordinator = coordinator;
this.sessionId = sessionId;
sessionIdBytes = ByteBufferUtil.bytes(sessionId);
watch = Stopwatch.createStarted();
}
public int elapsed()
{
long elapsed = watch.elapsed(TimeUnit.MICROSECONDS);
return elapsed < Integer.MAX_VALUE ? (int) elapsed : Integer.MAX_VALUE;
}
public void trace(String format, Object arg)
{
trace(MessageFormatter.format(format, arg).getMessage());
}
public void trace(String format, Object arg1, Object arg2)
{
trace(MessageFormatter.format(format, arg1, arg2).getMessage());
}
public void trace(String format, Object[] args)
{
trace(MessageFormatter.arrayFormat(format, args).getMessage());
}
public void trace(String message)
{
TraceState.trace(sessionIdBytes, message, elapsed());
}
public static void trace(final ByteBuffer sessionIdBytes, final String message, final int elapsed)
{
final ByteBuffer eventId = ByteBuffer.wrap(UUIDGen.getTimeUUIDBytes());
final String threadName = Thread.currentThread().getName();
StageManager.getStage(Stage.TRACING).execute(new WrappedRunnable()
{
public void runMayThrow()
{
CFMetaData cfMeta = CFMetaData.TraceEventsCf;
ColumnFamily cf = ArrayBackedSortedColumns.factory.create(cfMeta);
Tracing.addColumn(cf, Tracing.buildName(cfMeta, eventId, ByteBufferUtil.bytes("activity")), message);
Tracing.addColumn(cf, Tracing.buildName(cfMeta, eventId, ByteBufferUtil.bytes("source")), FBUtilities.getBroadcastAddress());
if (elapsed >= 0)
Tracing.addColumn(cf, Tracing.buildName(cfMeta, eventId, ByteBufferUtil.bytes("source_elapsed")), elapsed);
Tracing.addColumn(cf, Tracing.buildName(cfMeta, eventId, ByteBufferUtil.bytes("thread")), threadName);
Tracing.mutateWithCatch(new Mutation(Tracing.TRACE_KS, sessionIdBytes, cf));
}
});
}
public boolean acquireReference()
{
while (true)
{
int n = references.get();
if (n <= 0)
return false;
if (references.compareAndSet(n, n + 1))
return true;
}
}
public int releaseReference()
{
return references.decrementAndGet();
}
}