FatalIllegalConfigurationChangeHandler


1   /*
2    * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright notice.  All rights reserved.
3    */
4   package com.tc.config.schema.setup;
5   
6   import org.apache.commons.lang.ArrayUtils;
7   
8   import com.tc.config.schema.IllegalConfigurationChangeHandler;
9   import com.tc.config.schema.dynamic.ConfigItem;
10  import com.tc.logging.TCLogger;
11  import com.tc.logging.TCLogging;
12  
13  /**
14   * An {@link com.tc.config.schema.IllegalConfigurationChangeHandler} that prints
15   * a message to the screen and the logs, and then exits.
16   *
17   * NOTE: this code should no longer be engaged since the configuration modes
18   * were slimmed down to production and development. In production the client
19   * config is checked to match that of the servers. In development, the
20   * client's config simply applies to that client, whereas it used to be
21   * broadcast to other clients. Basically, config values cannot change after
22   * startup anymore.
23   */
24  public class FatalIllegalConfigurationChangeHandler implements IllegalConfigurationChangeHandler {
25  
26    private static TCLogger logger;
27  
28    private TCLogger getLogger() {
29      if(logger == null) {
30        logger = TCLogging.getLogger(FatalIllegalConfigurationChangeHandler.class);      
31      }
32      
33      return logger;
34    }
35    
36    public void changeFailed(ConfigItem item, Object   oldValue, Object   newValue) {
37      String   text = "Error: Terracotta is using an inconsistent configuration.\n\n"
38                    + "The configuration that this client is using is different from the one used by\n"
39                    + "the connected production server.\n\n" + "Specific information: " + item + " has changed.\n"
40                    + "   Old value: " + describe(oldValue) + "\n" + "   New value: " + describe(newValue) + "\n";
41  
42      System.err.println(text);
43      getLogger().fatal(text);
44      System.exit(3);
45    }
46  
47    private String   describe(Object   o) {
48      if (o == null) return "<null>";
49      if (o.getClass().isArray()) return ArrayUtils.toString(o);
50      else return o.toString();
51    }
52  
53  }
54
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