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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.

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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.tracing;

import java.net.InetAddress;
import java.util.Collections;
import java.util.UUID;

import org.apache.cassandra.concurrent.Stage;
import org.apache.cassandra.concurrent.StageManager;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.Mutation;
import org.apache.cassandra.exceptions.OverloadedException;
import org.apache.cassandra.service.StorageProxy;
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 TraceStateImpl extends TraceState
{
    public TraceStateImpl(InetAddress coordinator, UUID sessionId, Tracing.TraceType traceType)
    {
        super(coordinator, sessionId, traceType);
    }

    protected void traceImpl(String message)
    {
        final String threadName = Thread.currentThread().getName();
        final int elapsed = elapsed();

        executeMutation(TraceKeyspace.makeEventMutation(sessionIdBytes, message, elapsed, threadName, ttl));
    }

    static void executeMutation(final Mutation mutation)
    {
        StageManager.getStage(Stage.TRACING).execute(new WrappedRunnable()
        {
            protected void runMayThrow() throws Exception
            {
                mutateWithCatch(mutation);
            }
        });
    }

    static void mutateWithCatch(Mutation mutation)
    {
        try
        {
            StorageProxy.mutate(Collections.singletonList(mutation), ConsistencyLevel.ANY);
        }
        catch (OverloadedException e)
        {
            Tracing.logger.warn("Too many nodes are overloaded to save trace events");
        }
    }

}