001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: * Free SoftwareFoundation, Inc.
023: * 59 Temple Place, Suite 330
024: * Boston, MA 02111-1307 USA
025: *
026: * @author Scott Ferguson
027: */
028:
029: package com.caucho.server.cluster;
030:
031: import com.caucho.log.Log;
032: import com.caucho.vfs.Path;
033: import com.caucho.vfs.ReadStream;
034: import com.caucho.vfs.WriteStream;
035:
036: import java.io.IOException;
037: import java.util.logging.Level;
038: import java.util.logging.Logger;
039:
040: /**
041: * The ObjectBacking encapsulates the file persistent store
042: * for a distributed object.
043: */
044: public class ObjectBacking {
045: static protected final Logger log = Log.open(ObjectBacking.class);
046:
047: // The backing path
048: private Path _objectPath;
049:
050: // The owning persistent store
051: private Store _store;
052:
053: // The object id
054: private String _id;
055:
056: // The corresponding object (when live)
057: private DistributedObject _object;
058:
059: /**
060: * Initialize the object backing.
061: *
062: * @param id the object identifier
063: * @param objectPath the backing object path.
064: * @param store the owning distributed store
065: */
066: public ObjectBacking(String id, Path objectPath, Store store) {
067: _id = id;
068: _store = store;
069: _objectPath = objectPath;
070: }
071:
072: /**
073: * Returns the mangled id.
074: */
075: public String getId() {
076: return _id;
077: }
078:
079: /**
080: * Returns the backing path.
081: */
082: public Path getPath() {
083: return _objectPath;
084: }
085:
086: /**
087: * Returns any associated object.
088: */
089: public DistributedObject getObject() {
090: return _object;
091: }
092:
093: /**
094: * Sets an associated object.
095: */
096: public void setObject(DistributedObject object) {
097: _object = object;
098: }
099:
100: /**
101: * Opens the backing for reading.
102: */
103: public ReadStream openRead() throws IOException {
104: return _objectPath.openRead();
105: }
106:
107: /**
108: * Opens the backing for writing.
109: */
110: public WriteStream openWrite() throws IOException {
111: return _objectPath.openWrite();
112: }
113:
114: /**
115: * Saves a distributed object in the backing file.
116: */
117: synchronized void save(DistributedObject object) {
118: WriteStream os = null;
119: try {
120: os = _objectPath.openWrite();
121:
122: // _store.store(object, os);
123:
124: _object = object;
125: } catch (Exception e) {
126: log.log(Level.FINE, e.toString(), e);
127: } finally {
128: try {
129: if (os != null)
130: os.close();
131: } catch (IOException e1) {
132: }
133: }
134: }
135:
136: /**
137: * Removes the object from the backing.
138: */
139: synchronized public void remove() {
140: try {
141: _objectPath.remove();
142: } catch (IOException e) {
143: log.log(Level.FINE, e.toString(), e);
144: }
145: }
146:
147: /**
148: * Returns true if this backing allows logging.
149: */
150: public boolean canLog() {
151: return log.isLoggable(Level.FINE);
152: }
153:
154: /**
155: * Log data to the backing's log file.
156: */
157: public void log(String value) {
158: log.fine(value);
159: }
160:
161: public String toString() {
162: return "DistBacking[" + _objectPath + "]";
163: }
164: }
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