AbstractClusterStore


1   // You can redistribute this software and/or modify it under the terms of
2   // the Ozone Library License version 1 published by ozone-db.org.
3   //
4   // This file is
5   // Copyright (C) 2003-@year@ Per Nyfelt. All rights reserved.
6   //
7   package org.ozoneDB.core.storage;
8   
9   import org.ozoneDB.core.Env;
10  import org.ozoneDB.core.Transaction;
11  import org.ozoneDB.core.Permissions;
12  
13  import java.io.IOException  ;
14  
15  /**
16   * @author Per Nyfelt
17   */
18  public abstract class AbstractClusterStore {
19  
20      public final static String   POSTFIX_SEPARATOR = ".";
21      public final static String   POSTFIX_CLUSTER = ".cl";
22      public final static String   POSTFIX_LOCK = ".lk";
23      public final static String   POSTFIX_TEMP = ".tm";
24  
25      public transient long touchCount;
26  
27      protected transient Env env;
28  
29      public AbstractClusterStore(Env _env) {
30          this.env = _env;
31      }
32  
33      public String   basename(ClusterID cid) {
34          StringBuffer   filename = new StringBuffer  (env.getDatabaseDir());
35          filename.append(Env.DATA_DIR);
36          // filename.append (File.separator);
37          filename.append(cid.value());
38          return filename.toString();
39      }
40  
41      public abstract int currentBytesPerContainer();
42  
43      public abstract void registerContainerAndLock(StorageObjectContainer container, Permissions perms, Transaction locker, int lockLevel) throws Exception  ;
44  
45      protected abstract void activateCluster(Cluster cluster, int size);
46  
47      protected abstract void deactivateCluster(Cluster cluster) throws IOException  ;
48  
49      protected abstract void prepareCommitCluster(Transaction ta, ClusterID cid) throws IOException  , ClassNotFoundException  ;
50  
51      protected abstract void commitCluster(Transaction ta, ClusterID cid) throws IOException  , ClassNotFoundException   ;
52  
53      protected abstract void abortCluster(Transaction ta, ClusterID cid) throws IOException  , ClassNotFoundException  ;
54  }
55
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