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1   /*
2    * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.
8    *
9    * This code is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12   * version 2 for more details (a copy is included in the LICENSE file that
13   * accompanied this code).
14   *
15   * You should have received a copy of the GNU General Public License version
16   * 2 along with this work; if not, write to the Free Software Foundation,
17   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18   *
19   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20   * or visit www.oracle.com if you need additional information or have any
21   * questions.
22   *
23   */
24  
25  package sun.jvm.hotspot.memory;
26  
27  import java.util.*;
28  
29  import sun.jvm.hotspot.debugger.*;
30  import sun.jvm.hotspot.runtime.*;
31  import sun.jvm.hotspot.types.*;
32  
33  /** Factory containing a VirtualConstructor suitable for instantiating
34      wrapper objects for all types of generations */
35  
36  public class GenerationFactory {
37    private static VirtualConstructor ctor;
38  
39    static {
40      VM.registerVMInitializedObserver(new Observer() {
41          public void update(Observable o, Object data) {
42            initialize(VM.getVM().getTypeDataBase());
43          }
44        });
45    }
46  
47    private static synchronized void initialize(TypeDataBase db) {
48      ctor = new VirtualConstructor(db);
49  
50      ctor.addMapping("DefNewGeneration", DefNewGeneration.class);
51      ctor.addMapping("ParNewGeneration", ParNewGeneration.class);
52      ctor.addMapping("TenuredGeneration", TenuredGeneration.class);
53      ctor.addMapping("ConcurrentMarkSweepGeneration", ConcurrentMarkSweepGeneration.class);
54    }
55  
56    public static Generation newObject(Address addr) {
57        try {
58            return (Generation) ctor.instantiateWrapperFor(addr);
59        } catch (WrongTypeException e) {
60            return new Generation(addr) {
61                    public String name() {
62                        return "unknown generation type";
63                    }
64                    public void spaceIterate(SpaceClosure blk, boolean usedOnly) {
65                    }
66                    public void printOn(java.io.PrintStream tty) {
67                        tty.println("unknown subtype of Generation @ " + getAddress() + " (" +
68                                    virtualSpace().low() + "," + virtualSpace().high() + ")");
69                    }
70                    public long used() {
71                        return 0;
72                    }
73                    public long free() {
74                        return 0;
75                    }
76                    public long capacity() {
77                        return 0;
78                    }
79                    public long contiguousAvailable() {
80                        return 0;
81                    }
82  
83                };
84        }
85    }
86  }