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| author | Tom Tromey <tromey@gcc.gnu.org> | 2005-07-16 00:30:23 +0000 |
|---|---|---|
| committer | Tom Tromey <tromey@gcc.gnu.org> | 2005-07-16 00:30:23 +0000 |
| commit | f911ba985aa7fe0096c386c5be385ac5825ea527 (patch) | |
| tree | a0b991cf5866ae1d616639b906ac001811d74508 /libjava/classpath/java/rmi/server/UID.java | |
| parent | 6f4434b39b261de5317dc81ddfdd94d2e1d62b11 (diff) | |
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Initial revision
From-SVN: r102074
Diffstat (limited to 'libjava/classpath/java/rmi/server/UID.java')
| -rw-r--r-- | libjava/classpath/java/rmi/server/UID.java | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/libjava/classpath/java/rmi/server/UID.java b/libjava/classpath/java/rmi/server/UID.java new file mode 100644 index 0000000..0f492ba --- /dev/null +++ b/libjava/classpath/java/rmi/server/UID.java @@ -0,0 +1,127 @@ +/* UID.java -- + Copyright (c) 1996, 1997, 1998, 1999, 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.rmi.server; + +import java.io.DataInput; +import java.io.DataOutput; +import java.io.IOException; +import java.io.Serializable; + +public final class UID implements Serializable +{ +private static final long serialVersionUID = 1086053664494604050L; + +private static final Object lock = UID.class; +private static long baseTime = System.currentTimeMillis(); +private static short nextCount = Short.MIN_VALUE; +// This is sun's algorithm - don't ask me why ... +private static final int uniqueNr = (new Object()).hashCode(); + +private int unique; +private long time; +private short count; + +/** + * This is sun's algorithm - don't ask me why ... + */ +public UID() { + synchronized (lock) { + if (nextCount == Short.MAX_VALUE) { + long newtime; + for (;;) { + newtime = System.currentTimeMillis(); + if (newtime - baseTime > 1000) { + break; + } + try { + Thread.sleep(1000); + } + catch (InterruptedException _) { + } + } + baseTime = newtime; + nextCount = Short.MIN_VALUE; + } + count = nextCount++; + unique = uniqueNr; + time = baseTime; + } +} + +public UID(short num) { + unique = (int)num; + time = 0; + count = 0; +} + +public int hashCode() { + return (unique); +} + +public boolean equals(Object obj) { + if (obj instanceof UID) { + UID uid = (UID)obj; + if (this.unique == uid.unique && + this.time == uid.time && + this.count == uid.count) { + return (true); + } + } + return (false); +} + +public String toString() { + return ("[UID: " + unique + "," + time + "," + count + "]"); +} + +public void write(DataOutput out) throws IOException { + out.writeInt(unique); + out.writeLong(time); + out.writeShort(count); +} + +public static UID read(DataInput in) throws IOException { + UID id = new UID(); + id.unique = in.readInt(); + id.time = in.readLong(); + id.count = in.readShort(); + return (id); +} + +} |