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The AspectJ weaver introduces advices to java classes
package org.aspectj.weaver.tools.cache;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.ProtectionDomain;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.CRC32;
import org.aspectj.weaver.Dump;
import org.aspectj.weaver.tools.Trace;
import org.aspectj.weaver.tools.TraceFactory;
/*******************************************************************************
* Copyright (c) 2012 Contributors.
* 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://eclipse.org/legal/epl-v10.html
*
* Contributors:
* Abraham Nevado (lucierna) initial implementation
********************************************************************************/
public class SimpleCache {
private static final String SAME_BYTES_STRING = "IDEM";
private static final byte[] SAME_BYTES = SAME_BYTES_STRING.getBytes();
private Map cacheMap;
private boolean enabled = false;
// cache for generated classes
private Map generatedCache;
private static final String GENERATED_CACHE_SUBFOLDER = "panenka.cache";
private static final String GENERATED_CACHE_SEPARATOR = ";";
public static final String IMPL_NAME = "shared";
protected SimpleCache(String folder, boolean enabled) {
this.enabled = enabled;
cacheMap = Collections.synchronizedMap(StoreableCachingMap.init(folder));
if (enabled) {
String generatedCachePath = folder + File.separator + GENERATED_CACHE_SUBFOLDER;
File f = new File (generatedCachePath);
if (!f.exists()){
f.mkdir();
}
generatedCache = Collections.synchronizedMap(StoreableCachingMap.init(generatedCachePath,0));
}
}
public byte[] getAndInitialize(String classname, byte[] bytes,
ClassLoader loader, ProtectionDomain protectionDomain) {
if (!enabled) {
return null;
}
byte[] res = get(classname, bytes);
if (Arrays.equals(SAME_BYTES, res)) {
return bytes;
} else {
if (res != null) {
initializeClass(classname, res, loader, protectionDomain);
}
return res;
}
}
private byte[] get(String classname, byte bytes[]) {
String key = generateKey(classname, bytes);
byte[] res = cacheMap.get(key);
return res;
}
public void put(String classname, byte[] origbytes, byte[] wovenbytes) {
if (!enabled) {
return;
}
String key = generateKey(classname, origbytes);
if (Arrays.equals(origbytes, wovenbytes)) {
cacheMap.put(key, SAME_BYTES);
return;
}
cacheMap.put(key, wovenbytes);
}
private String generateKey(String classname, byte[] bytes) {
CRC32 checksum = new CRC32();
checksum.update(bytes);
long crc = checksum.getValue();
classname = classname.replace("/", ".");
return new String(classname + "-" + crc);
}
private static class StoreableCachingMap extends HashMap {
private String folder;
private static final String CACHENAMEIDX = "cache.idx";
private long lastStored = System.currentTimeMillis();
private static int DEF_STORING_TIMER = 60000; //ms
private int storingTimer;
private transient Trace trace;
private void initTrace(){
trace = TraceFactory.getTraceFactory().getTrace(StoreableCachingMap.class);
}
// private StoreableCachingMap(String folder) {
// this.folder = folder;
// initTrace();
// }
private StoreableCachingMap(String folder, int storingTimer){
this.folder = folder;
initTrace();
this.storingTimer = storingTimer;
}
public static StoreableCachingMap init(String folder) {
return init(folder,DEF_STORING_TIMER);
}
public static StoreableCachingMap init(String folder, int storingTimer) {
File file = new File(folder + File.separator + CACHENAMEIDX);
if (file.exists()) {
try {
ObjectInputStream in = new ObjectInputStream(
new FileInputStream(file));
// Deserialize the object
StoreableCachingMap sm = (StoreableCachingMap) in.readObject();
sm.initTrace();
in.close();
return sm;
} catch (Exception e) {
Trace trace = TraceFactory.getTraceFactory().getTrace(StoreableCachingMap.class);
trace.error("Error reading Storable Cache", e);
}
}
return new StoreableCachingMap(folder,storingTimer);
}
@Override
public Object get(Object obj) {
try {
if (super.containsKey(obj)) {
String path = (String) super.get(obj);
if (path.equals(SAME_BYTES_STRING)) {
return SAME_BYTES;
}
return readFromPath(path);
} else {
return null;
}
} catch (IOException e) {
trace.error("Error reading key:"+obj.toString(),e);
Dump.dumpWithException(e);
}
return null;
}
@Override
public Object put(Object key, Object value) {
try {
String path = null;
byte[] valueBytes = (byte[]) value;
if (Arrays.equals(valueBytes, SAME_BYTES)) {
path = SAME_BYTES_STRING;
} else {
path = writeToPath((String) key, valueBytes);
}
Object result = super.put(key, path);
storeMap();
return result;
} catch (IOException e) {
trace.error("Error inserting in cache: key:"+key.toString() + "; value:"+value.toString(), e);
Dump.dumpWithException(e);
}
return null;
}
public void storeMap() {
long now = System.currentTimeMillis();
if ((now - lastStored ) < storingTimer){
return;
}
File file = new File(folder + File.separator + CACHENAMEIDX);;
try {
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(file));
// Deserialize the object
out.writeObject(this);
out.close();
lastStored = now;
} catch (Exception e) {
trace.error("Error storing cache; cache file:"+file.getAbsolutePath(), e);
Dump.dumpWithException(e);
}
}
private byte[] readFromPath(String fullPath) throws IOException {
FileInputStream is = null ;
try{
is = new FileInputStream(fullPath);
}
catch (FileNotFoundException e){
//may be caused by a generated class that has been stored in generated cache but not saved at cache folder
System.out.println("FileNotFoundExceptions: The aspectj cache is corrupt. Please clean it and reboot the server. Cache path:"+this.folder );
e.printStackTrace();
return null;
}
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int nRead;
byte[] data = new byte[16384];
while ((nRead = is.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
is.close();
return buffer.toByteArray();
}
private String writeToPath(String key, byte[] bytes) throws IOException {
String fullPath = folder + File.separator + key;
FileOutputStream fos = new FileOutputStream(fullPath);
fos.write(bytes);
fos.flush();
fos.close();
return fullPath;
}
}
private void initializeClass(String className, byte[] bytes,
ClassLoader loader, ProtectionDomain protectionDomain) {
String[] generatedClassesNames = getGeneratedClassesNames(className,bytes);
if (generatedClassesNames == null) {
return;
}
for (String generatedClassName : generatedClassesNames) {
byte[] generatedBytes = get(generatedClassName, bytes);
if (protectionDomain == null) {
defineClass(loader, generatedClassName, generatedBytes);
} else {
defineClass(loader, generatedClassName, generatedBytes,
protectionDomain);
}
}
}
private String[] getGeneratedClassesNames(String className, byte[] bytes) {
String key = generateKey(className, bytes);
byte[] readBytes = generatedCache.get(key);
if (readBytes == null) {
return null;
}
String readString = new String(readBytes);
return readString.split(GENERATED_CACHE_SEPARATOR);
}
public void addGeneratedClassesNames(String parentClassName, byte[] parentBytes, String generatedClassName) {
if (!enabled) {
return;
}
String key = generateKey(parentClassName, parentBytes);
byte[] storedBytes = generatedCache.get(key);
if (storedBytes == null) {
generatedCache.put(key, generatedClassName.getBytes());
} else {
String storedClasses = new String(storedBytes);
storedClasses += GENERATED_CACHE_SEPARATOR + generatedClassName;
generatedCache.put(key, storedClasses.getBytes());
}
}
private Method defineClassMethod = null;
private Method defineClassWithProtectionDomainMethod = null;
private void defineClass(ClassLoader loader, String name, byte[] bytes) {
Object clazz = null;
try {
if (defineClassMethod == null) {
defineClassMethod = ClassLoader.class.getDeclaredMethod(
"defineClass", new Class[] { String.class,
bytes.getClass(), int.class, int.class });
}
defineClassMethod.setAccessible(true);
clazz = defineClassMethod.invoke(loader, new Object[] { name,
bytes, new Integer(0), new Integer(bytes.length) });
} catch (InvocationTargetException e) {
if (e.getTargetException() instanceof LinkageError) {
e.printStackTrace();
} else {
System.out.println("define generated class failed"
+ e.getTargetException());
}
} catch (Exception e) {
e.printStackTrace();
Dump.dumpWithException(e);
}
}
private void defineClass(ClassLoader loader, String name, byte[] bytes,
ProtectionDomain protectionDomain) {
Object clazz = null;
try {
// System.out.println(">> Defining with protection domain " + name +
// " pd=" + protectionDomain);
if (defineClassWithProtectionDomainMethod == null) {
defineClassWithProtectionDomainMethod = ClassLoader.class
.getDeclaredMethod("defineClass", new Class[] {
String.class, bytes.getClass(), int.class,
int.class, ProtectionDomain.class });
}
defineClassWithProtectionDomainMethod.setAccessible(true);
clazz = defineClassWithProtectionDomainMethod.invoke(loader,
new Object[] { name, bytes, Integer.valueOf(0),
new Integer(bytes.length), protectionDomain });
} catch (InvocationTargetException e) {
if (e.getTargetException() instanceof LinkageError) {
e.printStackTrace();
// is already defined (happens for X$ajcMightHaveAspect
// interfaces since aspects are reweaved)
// TODO maw I don't think this is OK and
} else {
e.printStackTrace();
}
}catch (NullPointerException e) {
System.out.println("NullPointerException loading class:"+name+". Probabily caused by a corruput cache. Please clean it and reboot the server");
} catch (Exception e) {
e.printStackTrace();
Dump.dumpWithException(e);
}
}
}