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org.apache.jcs.auxiliary.remote.RemoteCacheRestore |
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1 | package org.apache.jcs.auxiliary.remote; |
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2 | ||
3 | /* |
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4 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, |
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15 | * software distributed under the License is distributed on an |
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16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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17 | * KIND, either express or implied. See the License for the |
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18 | * specific language governing permissions and limitations |
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19 | * under the License. |
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20 | */ |
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21 | ||
22 | import java.rmi.Naming; |
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23 | ||
24 | import org.apache.commons.logging.Log; |
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25 | import org.apache.commons.logging.LogFactory; |
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26 | import org.apache.jcs.auxiliary.remote.behavior.IRemoteCacheObserver; |
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27 | import org.apache.jcs.auxiliary.remote.behavior.IRemoteCacheService; |
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28 | import org.apache.jcs.engine.behavior.ICacheRestore; |
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29 | ||
30 | /** |
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31 | * Used to repair the remote caches managed by the associated instance of RemoteCacheManager. |
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32 | * <p> |
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33 | * When there is an error the monitor kicks off. The Failover runner starts looks for a manager with |
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34 | * a connection to a remote cache that is not in error. If a manager's connection to a remote cache |
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35 | * is found to be in error, the restorer kicks off and tries to reconnect. When it is succesful, the |
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36 | * status of the manager changes. |
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37 | * <p> |
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38 | * When the failover runner finds that the primary is in good shape, it will switch back. Switching |
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39 | * back invovles setting the first no wait on the no wait facade. |
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40 | */ |
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41 | public class RemoteCacheRestore |
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42 | implements ICacheRestore |
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43 | { |
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44 | 0 | private final static Log log = LogFactory.getLog( RemoteCacheRestore.class ); |
45 | ||
46 | private final RemoteCacheManager rcm; |
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47 | ||
48 | // private final AuxiliaryCacheManager rcm; |
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49 | 0 | private boolean canFix = true; |
50 | ||
51 | private Object remoteObj; |
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52 | ||
53 | /** |
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54 | * Constructs with the given instance of RemoteCacheManager. |
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55 | * @param rcm |
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56 | */ |
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57 | public RemoteCacheRestore( RemoteCacheManager rcm ) |
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58 | 0 | { |
59 | // public RemoteCacheRestore(AuxiliaryCacheManager rcm) { |
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60 | 0 | this.rcm = rcm; |
61 | 0 | } |
62 | ||
63 | /** |
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64 | * Returns true if the connection to the remote host for the corresponding cache manager can be |
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65 | * successfully re-established. |
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66 | * <p> |
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67 | * @return true if we found a failover server |
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68 | */ |
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69 | public boolean canFix() |
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70 | { |
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71 | 0 | if ( !canFix ) |
72 | { |
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73 | 0 | return canFix; |
74 | } |
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75 | 0 | String registry = "//" + rcm.host + ":" + rcm.port + "/" + rcm.service; |
76 | 0 | if ( log.isInfoEnabled() ) |
77 | { |
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78 | 0 | log.info( "looking up server " + registry ); |
79 | } |
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80 | try |
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81 | { |
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82 | 0 | remoteObj = Naming.lookup( registry ); |
83 | 0 | if ( log.isInfoEnabled() ) |
84 | { |
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85 | 0 | log.info( "looking up server " + registry ); |
86 | } |
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87 | } |
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88 | 0 | catch ( Exception ex ) |
89 | { |
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90 | 0 | log.error( "host=" + rcm.host + "; port" + rcm.port + "; service=" + rcm.service ); |
91 | 0 | canFix = false; |
92 | 0 | } |
93 | 0 | return canFix; |
94 | } |
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95 | ||
96 | /** |
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97 | * Fixes up all the caches managed by the associated cache manager. |
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98 | */ |
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99 | public void fix() |
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100 | { |
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101 | 0 | if ( !canFix ) |
102 | { |
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103 | 0 | return; |
104 | } |
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105 | 0 | rcm.fixCaches( (IRemoteCacheService) remoteObj, (IRemoteCacheObserver) remoteObj ); |
106 | ||
107 | 0 | if ( log.isInfoEnabled() ) |
108 | { |
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109 | 0 | String msg = "Remote connection to " + "//" + rcm.host + ":" + rcm.port + "/" + rcm.service + " resumed."; |
110 | 0 | log.info( msg ); |
111 | } |
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112 | 0 | } |
113 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |