| /* |
| * 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.cloudera.htrace; |
| |
| import java.util.Random; |
| |
| /** |
| * Does some stuff and traces it. |
| */ |
| public class TraceCreator { |
| |
| /** |
| * Takes as input the SpanReceiver that should used as the sink for Spans when |
| * createDemoTrace() is called. |
| * |
| * @param receiver |
| */ |
| public TraceCreator(SpanReceiver receiver) { |
| Trace.addReceiver(receiver); |
| } |
| |
| public void createSampleRpcTrace() { |
| Span s = Trace.startSpan("rpc example", Sampler.ALWAYS); |
| try { |
| pretendRpcSend(); |
| } finally { |
| // This will produce a warning from Tracer.java that is expected. |
| s.stop(); |
| } |
| } |
| |
| public void createSimpleTrace() { |
| Span s = Trace.startSpan("beginning the trace.", Sampler.ALWAYS); |
| try { |
| importantWork1(); |
| } finally { |
| s.stop(); |
| } |
| } |
| |
| /** |
| * Creates the demo trace (will create different traces from call to call). |
| */ |
| public void createThreadedTraceTrace() { |
| Span s = Trace.startSpan("beginning the trace.", Sampler.ALWAYS); |
| try { |
| Random r = new Random(); |
| int numThreads = r.nextInt(4) + 1; |
| Thread[] threads = new Thread[numThreads]; |
| |
| for (int i = 0; i < numThreads; i++) { |
| threads[i] = new Thread(Trace.wrap(new MyRunnable())); |
| } |
| for (int i = 0; i < numThreads; i++) { |
| threads[i].start(); |
| } |
| for (int i = 0; i < numThreads; i++) { |
| try { |
| threads[i].join(); |
| } catch (InterruptedException e) { |
| } |
| } |
| importantWork1(); |
| } finally { |
| s.stop(); |
| } |
| } |
| |
| private void importantWork1() { |
| Span cur = Trace.startSpan("important work 1"); |
| try { |
| Thread.sleep((long) (5000 * Math.random())); |
| importantWork2(); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| } finally { |
| cur.stop(); |
| } |
| } |
| |
| private void importantWork2() { |
| Span cur = Trace.startSpan("important work 2"); |
| try { |
| Thread.sleep((long) (5000 * Math.random())); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| } finally { |
| cur.stop(); |
| } |
| } |
| |
| private class MyRunnable implements Runnable { |
| @Override |
| public void run() { |
| try { |
| Thread.sleep(1000); |
| Random r = new Random(); |
| int importantNumber = 100 / r.nextInt(3); |
| System.out.println("Important number: " + importantNumber); |
| } catch (InterruptedException ie) { |
| Thread.currentThread().interrupt(); |
| } catch (ArithmeticException ae) { |
| Span c = Trace.startSpan("dealing with arithmetic exception."); |
| try { |
| Thread.sleep((long) (5000 * Math.random())); |
| } catch (InterruptedException ie1) { |
| Thread.currentThread().interrupt(); |
| } finally { |
| c.stop(); |
| } |
| } |
| } |
| } |
| |
| public void pretendRpcSend() { |
| pretendRpcReceiveWithTraceInfo(Trace.traceInfo()); |
| } |
| |
| public void pretendRpcReceiveWithTraceInfo(TraceInfo traceInfo) { |
| Span s = Trace.startSpan("received RPC", traceInfo, Sampler.ALWAYS); |
| try { |
| importantWork1(); |
| } finally { |
| s.stop(); |
| } |
| } |
| } |