core/src/core/org/jnode/vm/InternString.java - new-gc-algorithms in JNode

package org.jnode.vm;

import org.jnode.util.BootableHashMap;

/**
 *
 */
public class InternString extends VmSystemObject {
    private static BootableHashMap<String, String> bootInternTable;
    private static boolean booted = false;

    public static String internString(String instance) {
        if (booted) {
            return instance.intern();
        } else {
            if (Vm.getVm().isBootstrap()) {
                if (bootInternTable == null) {
                    bootInternTable = new BootableHashMap<String, String>();
                }

                instance = instance.intern();
                //todo the string interned after emiting bootInternTable will be lost 
                if (!bootInternTable.isLocked()) {
                    synchronized (bootInternTable) {
                        final String str = bootInternTable.get(instance);
                        if (str != null) {
                            return str;
                        }
                        bootInternTable.put(instance, instance);
                    }
                }
                return instance;
            } else {
                return instance.intern();
            }
        }
    }

    //todo protect it
    public static void boot() {
        booted = true;
    }

    //todo protect it
    public static BootableHashMap<String, String> getBootInternTable() {
        return bootInternTable;
    }
}

1	package org.jnode.vm;
2
3	import org.jnode.util.BootableHashMap;
4
5	/**
6	*
7	*/
8	public class InternString extends VmSystemObject {
9	private static BootableHashMap<String, String> bootInternTable;
10	private static boolean booted = false;
11
12	public static String internString(String instance) {
13	if (booted) {
14	return instance.intern();
15	} else {
16	if (Vm.getVm().isBootstrap()) {
17	if (bootInternTable == null) {
18	bootInternTable = new BootableHashMap<String, String>();
19	}
20
21	instance = instance.intern();
22	//todo the string interned after emiting bootInternTable will be lost
23	if (!bootInternTable.isLocked()) {
24	synchronized (bootInternTable) {
25	final String str = bootInternTable.get(instance);
26	if (str != null) {
27	return str;
28	}
29	bootInternTable.put(instance, instance);
30	}
31	}
32	return instance;
33	} else {
34	return instance.intern();
35	}
36	}
37	}
38
39	//todo protect it
40	public static void boot() {
41	booted = true;
42	}
43
44	//todo protect it
45	public static BootableHashMap<String, String> getBootInternTable() {
46	return bootInternTable;
47	}
48	}

Gitorious