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/*******************************************************************************
* Copyright (c) 2006, 2008, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* David Knibb initial implementation
* Matthew Webster Eclipse 3.2 changes
* Martin Lippert extracted caching service factory
* Martin Lippert caching of generated classes
*******************************************************************************/
package org.eclipse.equinox.weaving.internal.caching.j9;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Map;
import com.ibm.oti.shared.HelperAlreadyDefinedException;
import com.ibm.oti.shared.Shared;
import com.ibm.oti.shared.SharedClassURLHelper;
import org.eclipse.equinox.service.weaving.CacheEntry;
import org.eclipse.equinox.service.weaving.ICachingService;
import org.osgi.framework.Bundle;
public class CachingService implements ICachingService {
SharedClassURLHelper urlhelper;
private final Bundle bundle;
private final ClassLoader classLoader;
private final String partition;
public CachingService(final ClassLoader loader, final Bundle bundle,
final String key) {
if (CachingServicePlugin.DEBUG)
System.out.println("> CachingService.<init>() bundle="
+ bundle.getSymbolicName() + ", loader=" + loader
+ ", key='" + key + "'");
this.bundle = bundle;
this.classLoader = loader;
this.partition = hashNamespace(key + bundle.getBundleId()
+ bundle.getLastModified());
try {
urlhelper = Shared.getSharedClassHelperFactory().getURLHelper(
classLoader);
} catch (final HelperAlreadyDefinedException e) {
e.printStackTrace();
}
if (CachingServicePlugin.DEBUG)
System.out.println("< CachingService.<init>() partition='"
+ partition + "', urlhelper=" + urlhelper);
}
/**
* @see org.eclipse.equinox.service.weaving.ICachingService#canCacheGeneratedClasses()
*/
public boolean canCacheGeneratedClasses() {
return false;
}
/**
* @see org.eclipse.equinox.service.weaving.ICachingService#findStoredClass(java.lang.String,
* java.net.URL, java.lang.String)
*/
public CacheEntry findStoredClass(final String namespace,
final URL sourceFileURL, final String name) {
final byte[] bytes = urlhelper.findSharedClass(partition,
sourceFileURL, name);
if (CachingServicePlugin.DEBUG && bytes != null)
System.out.println("- CachingService.findStoredClass() bundle="
+ bundle.getSymbolicName() + ", name=" + name + ", url="
+ sourceFileURL + ", bytes=" + bytes);
if (bytes != null) {
return new CacheEntry(true, bytes);
} else {
return new CacheEntry(false, null);
}
}
/**
* Hash the shared class namespace using MD5
*
* @param keyToHash
* @return the MD5 version of the input string
*/
public String hashNamespace(final String namespace) {
MessageDigest md = null;
try {
md = MessageDigest.getInstance("MD5");
} catch (final NoSuchAlgorithmException e) {
e.printStackTrace();
}
final byte[] bytes = md.digest(namespace.getBytes());
final StringBuffer result = new StringBuffer();
for (int i = 0; i < bytes.length; i++) {
final byte b = bytes[i];
int num;
if (b < 0) {
num = b + 256;
} else {
num = b;
}
String s = Integer.toHexString(num);
while (s.length() < 2) {
s = "0" + s;
}
result.append(s);
}
return new String(result);
}
/**
* @see org.eclipse.equinox.service.weaving.ICachingService#stop()
*/
public void stop() {
}
/**
* @see org.eclipse.equinox.service.weaving.ICachingService#storeClass(java.lang.String,
* java.net.URL, java.lang.Class, byte[])
*/
public boolean storeClass(final String namespace, final URL sourceFileURL,
final Class<?> clazz, final byte[] classbytes) {
final boolean success = urlhelper.storeSharedClass(partition,
sourceFileURL, clazz);
if (CachingServicePlugin.DEBUG && success)
System.out.println("- CachingService.storeClass() bundle="
+ bundle.getSymbolicName() + ", clazz=" + clazz + ", url="
+ sourceFileURL);
return success;
}
/**
* @see org.eclipse.equinox.service.weaving.ICachingService#storeClassAndGeneratedClasses(java.lang.String,
* java.net.URL, java.lang.Class, byte[], java.util.Map)
*/
public boolean storeClassAndGeneratedClasses(final String namespace,
final URL sourceFileUrl, final Class<?> clazz,
final byte[] classbytes, final Map<String, byte[]> generatedClasses) {
return false;
}
}
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