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1   package org.e2etrace.trace;
2   
3   /*
4    * Copyright 2006 Gunther Popp
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *      http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  /**
20   * Default implementation of a trace session manager.
21   * <p>
22   *
23   * This simple trace session manager maintains a single trace session. Hence, it
24   * is only suitable for monitoring sequential service execution in an
25   * application. This approach does <em>not</em> work in application server
26   * environments!
27   * <p>
28   *
29   * This class implements the singleton pattern.
30   * <p>
31   *
32   * @author Gunther Popp
33   *
34   */
35  public class DefaultTraceSessionManager extends AbstractTraceSessionManager {
36  
37    private static final DefaultTraceSessionManager instance = new DefaultTraceSessionManager();
38  
39    private ITraceSession session;
40  
41    /**
42     * Returns the singleton instance of the session manager.
43     * <p>
44     *
45     * @return trace session manager
46     */
47    public static DefaultTraceSessionManager getInstance() {
48      return instance;
49    }
50  
51    /**
52     * Default constructor.
53     * <p>
54     *
55     */
56    private DefaultTraceSessionManager() {
57      super();
58    }
59  
60    /** {@inheritDoc} */
61    protected ITraceSession requestCurrentSession() {
62      return this.session;
63    }
64  
65    /** {@inheritDoc} */
66    protected void assignCurrentSession(ITraceSession session) {
67      this.session = session;
68    }
69  
70    /** {@inheritDoc} */
71    public void releaseCurrentSession() {
72      this.session = null;
73    }
74  
75  }