001: /*
002: * $Id: MediaCache.java,v 1.3 2002/03/22 04:55:07 skavish Exp $
003: *
004: * ==========================================================================
005: *
006: * The JGenerator Software License, Version 1.0
007: *
008: * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
009: *
010: * Redistribution and use in source and binary forms, with or without
011: * modification, are permitted provided that the following conditions are met:
012: *
013: * 1. Redistributions of source code must retain the above copyright
014: * notice, this list of conditions and the following disclaimer.
015: *
016: * 2. Redistributions in binary form must reproduce the above copyright
017: * notice, this list of conditions and the following disclaimer in
018: * the documentation and/or other materials provided with the
019: * distribution.
020: *
021: * 3. The end-user documentation included with the redistribution, if
022: * any, must include the following acknowlegement:
023: * "This product includes software developed by Dmitry Skavish
024: * (skavish@usa.net, http://www.flashgap.com/)."
025: * Alternately, this acknowlegement may appear in the software itself,
026: * if and wherever such third-party acknowlegements normally appear.
027: *
028: * 4. The name "The JGenerator" must not be used to endorse or promote
029: * products derived from this software without prior written permission.
030: * For written permission, please contact skavish@usa.net.
031: *
032: * 5. Products derived from this software may not be called "The JGenerator"
033: * nor may "The JGenerator" appear in their names without prior written
034: * permission of Dmitry Skavish.
035: *
036: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039: * DISCLAIMED. IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
040: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: * SUCH DAMAGE.
048: *
049: */
050:
051: package org.openlaszlo.iv.flash.cache;
052:
053: import org.openlaszlo.iv.flash.api.*;
054: import org.openlaszlo.iv.flash.util.*;
055: import org.openlaszlo.iv.flash.url.*;
056: import java.util.*;
057: import java.io.*;
058:
059: public class MediaCache extends GenericCache {
060:
061: private static MediaCache instance = new MediaCache();
062:
063: private MediaCache() {
064: }
065:
066: public static MediaCache getInstance() {
067: return instance;
068: }
069:
070: public static CacheSettings getSettings() {
071: return instance.getMySettings();
072: }
073:
074: /**
075: * Get cached media
076: *
077: * @param key cache key
078: */
079: public static Object getMedia(IVUrl url) {
080: return getMedia(url.getName());
081: }
082:
083: /**
084: * Get cached media
085: *
086: * @param key cache key
087: */
088: public static Object getMedia(String key) {
089: CacheItem item = instance.getItem(key);
090: if (item == null)
091: return null;
092: return item.getObject();
093: }
094:
095: /**
096: * Add media to cache
097: *
098: * @param url url of media to cache
099: * @param media media object
100: * @param size size of the media
101: * @param templCache template parameter cache
102: */
103: public static void addMedia(IVUrl url, Object media, int size,
104: boolean templCache) {
105: // check whether we need to cache or not
106: long lifespan = getSettings().getDefaultExpire();
107: if (!getSettings().isForce()) {
108: String gmcStr = url.getParameter("gmc");
109: if (gmcStr != null) {
110: if (!Util.toBool(gmcStr, false))
111: return;
112: String v = url.getParameter("gme");
113: if (v != null) {
114: lifespan = Util.toLong(v, -1L) * 1000L;
115: }
116: } else {
117: if (!templCache)
118: return;
119: }
120: }
121: // yes, let's cache the media
122: long now = System.currentTimeMillis();
123: if (lifespan <= 0) {
124: lifespan = Long.MAX_VALUE - now;
125: }
126: long expire = now + lifespan;
127: CacheItem item = new MediaCacheItem(url, media, size, now,
128: expire, getSettings().isCheckModifiedSince());
129: instance.addItem(item);
130: }
131:
132: protected boolean isModified(CacheItem item) {
133: if (!getSettings().isCheckModifiedSince())
134: return super .isModified(item);
135: MediaCacheItem it = (MediaCacheItem) item;
136: it.getUrl().refresh();
137: return it.lastModified() != it.getUrl().lastModified();
138: }
139:
140: public static class MediaCacheItem extends CacheItem {
141: private long lastModified = 0;
142: private IVUrl url;
143:
144: public MediaCacheItem(IVUrl url, Object object, int size,
145: long cacheTime, long expireAfter,
146: boolean isCheckModifiedSince) {
147: super (url.getName(), object, size, cacheTime, expireAfter);
148: this .url = url;
149: if (isCheckModifiedSince) {
150: this .lastModified = url.lastModified();
151: }
152: }
153:
154: public IVUrl getUrl() {
155: return url;
156: }
157:
158: public long lastModified() {
159: return lastModified;
160: }
161: }
162:
163: }
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