| /* |
| * 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.Map; |
| import java.util.UUID; |
| |
| import org.apache.cassandra.concurrent.Stage; |
| import org.apache.cassandra.concurrent.StageManager; |
| import org.apache.cassandra.utils.WrappedRunnable; |
| |
| |
| /** |
| * A trace session context. Able to track and store trace sessions. A session is usually a user initiated query, and may |
| * have multiple local and remote events before it is completed. All events and sessions are stored at keyspace. |
| */ |
| class TracingImpl extends Tracing |
| { |
| public void stopSessionImpl() |
| { |
| final TraceStateImpl state = getStateImpl(); |
| if (state == null) |
| return; |
| |
| int elapsed = state.elapsed(); |
| ByteBuffer sessionId = state.sessionIdBytes; |
| int ttl = state.ttl; |
| |
| state.executeMutation(TraceKeyspace.makeStopSessionMutation(sessionId, elapsed, ttl)); |
| } |
| |
| public TraceState begin(final String request, final InetAddress client, final Map<String, String> parameters) |
| { |
| assert isTracing(); |
| |
| final TraceStateImpl state = getStateImpl(); |
| assert state != null; |
| |
| final long startedAt = System.currentTimeMillis(); |
| final ByteBuffer sessionId = state.sessionIdBytes; |
| final String command = state.traceType.toString(); |
| final int ttl = state.ttl; |
| |
| state.executeMutation(TraceKeyspace.makeStartSessionMutation(sessionId, client, parameters, request, startedAt, command, ttl)); |
| return state; |
| } |
| |
| /** |
| * Convert the abstract tracing state to its implementation. |
| * |
| * Expired states are not put in the sessions but the check is for extra safety. |
| * |
| * @return the state converted to its implementation, or null |
| */ |
| private TraceStateImpl getStateImpl() |
| { |
| TraceState state = get(); |
| if (state == null) |
| return null; |
| |
| if (state instanceof ExpiredTraceState) |
| { |
| ExpiredTraceState expiredTraceState = (ExpiredTraceState) state; |
| state = expiredTraceState.getDelegate(); |
| } |
| |
| if (state instanceof TraceStateImpl) |
| { |
| return (TraceStateImpl)state; |
| } |
| |
| assert false : "TracingImpl states should be of type TraceStateImpl"; |
| return null; |
| } |
| |
| @Override |
| protected TraceState newTraceState(InetAddress coordinator, UUID sessionId, TraceType traceType) |
| { |
| return new TraceStateImpl(coordinator, sessionId, traceType); |
| } |
| |
| /** |
| * Called from {@link org.apache.cassandra.net.OutboundTcpConnection} for non-local traces (traces |
| * that are not initiated by local node == coordinator). |
| */ |
| public void trace(final ByteBuffer sessionId, final String message, final int ttl) |
| { |
| final String threadName = Thread.currentThread().getName(); |
| |
| StageManager.getStage(Stage.TRACING).execute(new WrappedRunnable() |
| { |
| public void runMayThrow() |
| { |
| TraceStateImpl.mutateWithCatch(TraceKeyspace.makeEventMutation(sessionId, message, -1, threadName, ttl)); |
| } |
| }); |
| } |
| } |