001: /*
002: The contents of this file are subject to the Common Public Attribution License
003: Version 1.0 (the "License"); you may not use this file except in compliance with
004: the License. You may obtain a copy of the License at
005: http://www.projity.com/license . The License is based on the Mozilla Public
006: License Version 1.1 but Sections 14 and 15 have been added to cover use of
007: software over a computer network and provide for limited attribution for the
008: Original Developer. In addition, Exhibit A has been modified to be consistent
009: with Exhibit B.
010:
011: Software distributed under the License is distributed on an "AS IS" basis,
012: WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
013: specific language governing rights and limitations under the License. The
014: Original Code is OpenProj. The Original Developer is the Initial Developer and
015: is Projity, Inc. All portions of the code written by Projity are Copyright (c)
016: 2006, 2007. All Rights Reserved. Contributors Projity, Inc.
017:
018: Alternatively, the contents of this file may be used under the terms of the
019: Projity End-User License Agreeement (the Projity License), in which case the
020: provisions of the Projity License are applicable instead of those above. If you
021: wish to allow use of your version of this file only under the terms of the
022: Projity License and not to allow others to use your version of this file under
023: the CPAL, indicate your decision by deleting the provisions above and replace
024: them with the notice and other provisions required by the Projity License. If
025: you do not delete the provisions above, a recipient may use your version of this
026: file under either the CPAL or the Projity License.
027:
028: [NOTE: The text of this license may differ slightly from the text of the notices
029: in Exhibits A and B of the license at http://www.projity.com/license. You should
030: use the latest text at http://www.projity.com/license for your modifications.
031: You may not remove this license text from the source files.]
032:
033: Attribution Information: Attribution Copyright Notice: Copyright © 2006, 2007
034: Projity, Inc. Attribution Phrase (not exceeding 10 words): Powered by OpenProj,
035: an open source solution from Projity. Attribution URL: http://www.projity.com
036: Graphic Image as provided in the Covered Code as file: openproj_logo.png with
037: alternatives listed on http://www.projity.com/logo
038:
039: Display of Attribution Information is required in Larger Works which are defined
040: in the CPAL as a work which combines Covered Code or portions thereof with code
041: not governed by the terms of the CPAL. However, in addition to the other notice
042: obligations, all copies of the Covered Code in Executable and Source Code form
043: distributed must, as a form of attribution of the original author, include on
044: each user interface screen the "OpenProj" logo visible to all users. The
045: OpenProj logo should be located horizontally aligned with the menu bar and left
046: justified on the top left of the screen adjacent to the File menu. The logo
047: must be at least 100 x 25 pixels. When users click on the "OpenProj" logo it
048: must direct them back to http://www.projity.com.
049: */
050: package com.projity.pm.key.uniqueid;
051:
052: import java.util.Iterator;
053: import java.util.LinkedList;
054: import java.util.List;
055:
056: import com.projity.pm.time.MutableInterval;
057: import com.projity.session.Session;
058: import com.projity.session.SessionFactory;
059:
060: /**
061: *
062: */
063: public class UniqueIdPool {
064: protected static int MIN_SIZE = 10;
065: protected static int DEFAULT_SIZE = 500;
066: protected static UniqueIdPool instance;
067:
068: public static UniqueIdPool getInstance() {
069: if (instance == null)
070: instance = new UniqueIdPool();
071: return instance;
072: }
073:
074: protected List serverIntervals;
075: protected int reservationSem;
076:
077: protected long lastIdReservation = -1;
078:
079: protected UniqueIdPool() {
080: serverIntervals = new LinkedList();
081: }
082:
083: public synchronized long getId(Session session)
084: throws UniqueIdException {
085: int idCount = getIdCount();
086: if (serverIntervals.size() == 0) {
087: //if (onlyGlobal){
088: try {
089: makeServerReservationSync(idCount, session);
090: } catch (Exception e) {
091: e.printStackTrace();
092: throw new UniqueIdException("Server exception");
093: }
094: // }
095: // else makeServerReservationAsync(idCount);
096: }
097:
098: MutableInterval interval;
099: long id = -1;
100: int size = 0;
101: synchronized (serverIntervals) {
102: for (Iterator i = serverIntervals.iterator(); i.hasNext();) {
103: interval = (MutableInterval) i.next();
104: if (id == -1) {
105: id = interval.getStart();
106: interval.setStart(id + 1);
107: if (interval.getStart() > interval.getEnd()) {
108: i.remove();
109: continue;
110: }
111: }
112: size += interval.getEnd() - interval.getStart() + 1;
113: }
114: }
115: if (size < getMinIdCount())
116: makeServerReservationAsync(idCount - size, session);
117: // long r=(id==-1&&!onlyGlobal)?getLocalId():id;
118: // return r;
119: return id;
120: }
121:
122: protected int getIdCount() {
123: long t = System.currentTimeMillis();
124: if (lastIdReservation != -1 && t - lastIdReservation < 10000)
125: return DEFAULT_SIZE * 10;
126: return DEFAULT_SIZE;
127: }
128:
129: protected int getMinIdCount() {
130: return MIN_SIZE;
131: }
132:
133: protected void makeServerReservationAsync(final int count,
134: final Session session) {
135: Thread idBookingThread = new Thread() {
136: public void run() {
137: synchronized (this ) {
138: if (reservationSem > 0)
139: return;
140: reservationSem++;
141: }
142: try {
143: makeServerReservation(count, session);
144: } catch (Exception e) {
145: System.out.println("Id cannot be retrieved: " + e);
146: } finally {
147: synchronized (this ) {
148: reservationSem--;
149: }
150: }
151:
152: }
153: };
154: idBookingThread.start();
155: }
156:
157: protected void makeServerReservationSync(final int count,
158: Session session) throws Exception {
159: synchronized (this ) {
160: reservationSem++;
161: }
162: try {
163: makeServerReservation(count, session);
164: } finally {
165: synchronized (this ) {
166: reservationSem--;
167: }
168: }
169: }
170:
171: protected void makeServerReservation(final int count,
172: Session session) throws Exception {
173: System.out.println("ID reservation...");
174: lastIdReservation = System.currentTimeMillis();
175: MutableInterval interval = (MutableInterval) SessionFactory
176: .call(session, "bookUIDInterval",
177: new Class[] { int.class },
178: new Object[] { count });
179: synchronized (serverIntervals) {
180: serverIntervals.add(interval);
181: }
182: System.out.println("ID reservation, new pool: " + dump());
183: }
184:
185: public String dump() {
186: StringBuffer buf = new StringBuffer();
187: buf.append('{');
188: synchronized (serverIntervals) {
189: for (Iterator i = serverIntervals.iterator(); i.hasNext();) {
190: MutableInterval interval = (MutableInterval) i.next();
191: buf.append('[').append(interval.getStart()).append(',')
192: .append(interval.getEnd()).append(']');
193: if (i.hasNext())
194: buf.append(',');
195: }
196: }
197: buf.append('}');
198: return buf.toString();
199: }
200: }
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