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added basic server side image caching

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This commit is contained in:
Erik Forkalsrud 2009-01-19 23:14:26 -08:00
parent 647bae4020
commit 5c9af5b42d
4 changed files with 202 additions and 9 deletions
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123
etc/ehcache-1.5.0.xsd Normal file
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@ -0,0 +1,123 @@
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
<xs:element name="ehcache" >
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="1" ref="diskStore"/>
<xs:element minOccurs="0" maxOccurs="1"
ref="cacheManagerEventListenerFactory"/>
<xs:element minOccurs="0" maxOccurs="1"
ref="cacheManagerPeerProviderFactory"/>
<xs:element minOccurs="0" maxOccurs="1"
ref="cacheManagerPeerListenerFactory"/>
<xs:element ref="defaultCache"/>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="cache"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="diskStore">
<xs:complexType>
<xs:attribute name="path" use="optional" />
</xs:complexType>
</xs:element>
<xs:element name="cacheManagerEventListenerFactory">
<xs:complexType>
<xs:attribute name="class" use="required"/>
<xs:attribute name="properties" use="optional"/>
<xs:attribute name="propertySeparator" use="optional"/>
</xs:complexType>
</xs:element>
<xs:element name="cacheManagerPeerProviderFactory">
<xs:complexType>
<xs:attribute name="class" use="required"/>
<xs:attribute name="properties" use="optional"/>
<xs:attribute name="propertySeparator" use="optional"/>
</xs:complexType>
</xs:element>
<xs:element name="cacheManagerPeerListenerFactory">
<xs:complexType>
<xs:attribute name="class" use="required"/>
<xs:attribute name="properties" use="optional"/>
<xs:attribute name="propertySeparator" use="optional"/>
</xs:complexType>
</xs:element>
<!-- add clone support for addition of cacheExceptionHandler. Important! -->
<xs:element name="defaultCache">
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="cacheEventListenerFactory"/>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="cacheExtensionFactory"/>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="cacheLoaderFactory"/>
<xs:element minOccurs="0" maxOccurs="1" ref="bootstrapCacheLoaderFactory"/>
<xs:element minOccurs="0" maxOccurs="1" ref="cacheExceptionHandlerFactory"/>
</xs:sequence>
<xs:attribute name="diskExpiryThreadIntervalSeconds" use="optional" type="xs:integer"/>
<xs:attribute name="diskSpoolBufferSizeMB" use="optional" type="xs:integer"/>
<xs:attribute name="diskPersistent" use="optional" type="xs:boolean"/>
<xs:attribute name="eternal" use="required" type="xs:boolean"/>
<xs:attribute name="maxElementsInMemory" use="required" type="xs:integer"/>
<xs:attribute name="memoryStoreEvictionPolicy" use="optional" type="xs:string"/>
<xs:attribute name="overflowToDisk" use="required" type="xs:boolean"/>
<xs:attribute name="timeToIdleSeconds" use="optional" type="xs:integer"/>
<xs:attribute name="timeToLiveSeconds" use="optional" type="xs:integer"/>
<xs:attribute name="maxElementsOnDisk" use="optional" type="xs:integer"/>
</xs:complexType>
</xs:element>
<xs:element name="cache">
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="cacheEventListenerFactory"/>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="cacheExtensionFactory"/>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="cacheLoaderFactory"/>
<xs:element minOccurs="0" maxOccurs="1" ref="bootstrapCacheLoaderFactory"/>
<xs:element minOccurs="0" maxOccurs="1" ref="cacheExceptionHandlerFactory"/>
</xs:sequence>
<xs:attribute name="diskExpiryThreadIntervalSeconds" use="optional" type="xs:integer"/>
<xs:attribute name="diskSpoolBufferSizeMB" use="optional" type="xs:integer"/>
<xs:attribute name="diskPersistent" use="optional" type="xs:boolean"/>
<xs:attribute name="eternal" use="required" type="xs:boolean"/>
<xs:attribute name="maxElementsInMemory" use="required" type="xs:integer"/>
<xs:attribute name="memoryStoreEvictionPolicy" use="optional" type="xs:string"/>
<xs:attribute name="name" use="required" type="xs:string"/>
<xs:attribute name="overflowToDisk" use="required" type="xs:boolean"/>
<xs:attribute name="timeToIdleSeconds" use="optional" type="xs:integer"/>
<xs:attribute name="timeToLiveSeconds" use="optional" type="xs:integer"/>
<xs:attribute name="maxElementsOnDisk" use="optional" type="xs:integer"/>
</xs:complexType>
</xs:element>
<xs:element name="cacheEventListenerFactory">
<xs:complexType>
<xs:attribute name="class" use="required"/>
<xs:attribute name="properties" use="optional"/>
<xs:attribute name="propertySeparator" use="optional"/>
</xs:complexType>
</xs:element>
<xs:element name="bootstrapCacheLoaderFactory">
<xs:complexType>
<xs:attribute name="class" use="required"/>
<xs:attribute name="properties" use="optional"/>
<xs:attribute name="propertySeparator" use="optional"/>
</xs:complexType>
</xs:element>
<xs:element name="cacheExtensionFactory">
<xs:complexType>
<xs:attribute name="class" use="required"/>
<xs:attribute name="properties" use="optional"/>
<xs:attribute name="propertySeparator" use="optional"/>
</xs:complexType>
</xs:element>
<xs:element name="cacheExceptionHandlerFactory">
<xs:complexType>
<xs:attribute name="class" use="required"/>
<xs:attribute name="properties" use="optional"/>
<xs:attribute name="propertySeparator" use="optional"/>
</xs:complexType>
</xs:element>
<xs:element name="cacheLoaderFactory">
<xs:complexType>
<xs:attribute name="class" use="required"/>
<xs:attribute name="properties" use="optional"/>
<xs:attribute name="propertySeparator" use="optional"/>
</xs:complexType>
</xs:element>
</xs:schema>

20
etc/ehcache.xml Normal file
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@ -0,0 +1,20 @@
<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ehcache-1.5.0.xsd">
<diskStore path="java.io.tmpdir"/>
<defaultCache eternal="false" maxElementsInMemory="200" overflowToDisk="false" />
<cache
name="imageCache"
maxElementsInMemory="120"
maxElementsOnDisk="5000"
eternal="true"
overflowToDisk="true"
diskPersistent="true"
diskSpoolBufferSizeMB="20"
diskExpiryThreadIntervalSeconds="1"
memoryStoreEvictionPolicy="LFU"/>
</ehcache>

5
pom.xml
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@ -108,6 +108,11 @@
<version>2.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>1.5.0</version>
</dependency>
</dependencies>
<repositories>
<repository>

63
src/org/forkalsrud/album/web/AlbumServlet.java
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@ -4,6 +4,7 @@ import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
@ -20,6 +21,10 @@ import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;
import org.forkalsrud.album.exif.Dimension;
import org.forkalsrud.album.exif.DirectoryEntry;
import org.forkalsrud.album.exif.Entry;
@ -31,6 +36,7 @@ public class AlbumServlet
{
File base;
String basePrefix;
Cache imageCache;
@Override
public void init()
@ -39,6 +45,9 @@ public class AlbumServlet
System.out.println("in init of Album");
base = new File(getServletConfig().getInitParameter("base")).getAbsoluteFile();
basePrefix = "/" + base.getName();
CacheManager cacheManager = new CacheManager();
imageCache = cacheManager.getCache("imageCache");
}
@Override
@ -75,12 +84,13 @@ public class AlbumServlet
return;
}
if (req.getParameter("size") != null) {
String size = req.getParameter("size");
if (size != null) {
try {
res.setContentType("image/jpeg");
FileEntry e = (FileEntry)DirectoryEntry.getEntry(file);
scaleImage(req, res, file, e.getThumbnail(), req.getParameter("size"));
scaleImage(req, res, file, e.getThumbnail(), size);
res.setStatus(HttpServletResponse.SC_OK);
return;
} catch (Exception e) {
@ -134,7 +144,7 @@ public class AlbumServlet
return reqDate > 0 && fDate > 0 && fDate <= reqDate;
}
synchronized void scaleImage(HttpServletRequest req, HttpServletResponse res, File file, Thumbnail thumbnail, String size) throws IOException {
void scaleImage(HttpServletRequest req, HttpServletResponse res, File file, Thumbnail thumbnail, String size) throws IOException {
if (notModified(req, file)) {
res.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
@ -150,6 +160,24 @@ public class AlbumServlet
res.setDateHeader("Last-Modified", file.lastModified());
res.setHeader("ETag", fileEtag);
String key = file.getPath() + ":" + size;
Element element = imageCache.get(key);
if (element != null) {
CachedImage cimg = (CachedImage) element.getObjectValue();
if (cimg.lastModified == file.lastModified()) {
System.out.println("cache hit on " + key);
//res.setContentType(cimg.mimeType);
res.setContentLength(cimg.bits.length);
res.getOutputStream().write(cimg.bits);
return;
} else {
System.out.println(" " + key + " has changed so cache entry wil be refreshed");
imageCache.remove(key);
}
}
synchronized (this) {
Dimension orig = thumbnail.getSize();
Dimension outd;
if (size.endsWith("h")) {
@ -219,15 +247,26 @@ public class AlbumServlet
Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
ImageWriter writer = writers.next();
// ImageWriteParam wParam = writer.getDefaultWriteParam();
// wParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
// wParam.setCompressionQuality(1.0f);
ImageOutputStream ios = ImageIO.createImageOutputStream(res.getOutputStream());
ByteArrayOutputStream bits = new ByteArrayOutputStream();
ImageOutputStream ios = ImageIO.createImageOutputStream(bits);
writer.setOutput(ios);
// writer.write(null, new IIOImage(buf2, null, null), wParam);
writer.write(buf2);
ios.flush();
res.getOutputStream().close();
CachedImage cimg = new CachedImage();
cimg.lastModified = file.lastModified();
cimg.mimeType = "image/jpeg";
cimg.bits = bits.toByteArray();
imageCache.put(new Element(key, cimg));
System.out.println(" " + key + " added to the cache with size " + cimg.bits.length + " -- now " + imageCache.getSize() + " entries");
//res.setContentType(cimg.mimeType);
res.setContentLength(cimg.bits.length);
res.getOutputStream().write(cimg.bits);
}
}
@ -273,6 +312,12 @@ public class AlbumServlet
}
}
}
static class CachedImage {
long lastModified;
String mimeType;
byte[] bits;
}
}
// eof