org.aspectj.weaver.tools.cache.ZippedFileCacheBacking Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of aspectjweaver Show documentation
Show all versions of aspectjweaver Show documentation
The AspectJ weaver applies aspects to Java classes. It can be used as a Java agent in order to apply load-time
weaving (LTW) during class-loading and also contains the AspectJ runtime classes.
/*******************************************************************************
* Copyright (c) 2012 Contributors.
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v 2.0
* which accompanies this distribution and is available at
* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
*
* Contributors:
* Lyor Goldstein (vmware) add support for weaved class being re-defined
*******************************************************************************/
package org.aspectj.weaver.tools.cache;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StreamCorruptedException;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
import org.aspectj.util.FileUtil;
import org.aspectj.util.LangUtil;
/**
* Uses a ZIP file to store the instrumented classes/aspects - each one as a
* separate {@link ZipEntry}. This mechanism is suitable for relatively
* large numbers of instrumented classes/aspects (100's and more) since it
* holds all of them in a single (ZIP) file. The down side is that any
* modifications to the cache require re-writing the entire ZIP file. This
* can cause the ZIP file to become corrupted if interrupted in mid-update,
* thus requiring the re-population of the cache on next application activation
* (though the overhead in this case is not prohibitvely high...)
*/
public class ZippedFileCacheBacking extends AsynchronousFileCacheBacking {
public static final String ZIP_FILE = "cache.zip";
private static final AsynchronousFileCacheBackingCreator defaultCreator=
new AsynchronousFileCacheBackingCreator() {
public ZippedFileCacheBacking create(File cacheDir) {
return new ZippedFileCacheBacking(cacheDir);
}
};
private final File zipFile;
public ZippedFileCacheBacking(File cacheDir) {
super(cacheDir);
zipFile = new File(cacheDir, ZIP_FILE);
}
public File getZipFile () {
return zipFile;
}
public static final ZippedFileCacheBacking createBacking (File cacheDir) {
return createBacking(cacheDir, defaultCreator);
}
@Override
protected void writeClassBytes(String key, byte[] bytes) throws Exception {
File outFile=getZipFile();
Map entriesMap;
try {
entriesMap = readZipClassBytes(outFile);
} catch(Exception e) {
if ((logger != null) && logger.isTraceEnabled()) {
logger.warn("writeClassBytes(" + outFile + ")[" + key + "]"
+ " failed (" + e.getClass().getSimpleName() + ")"
+ " to read current data: " + e.getMessage(),
e);
}
FileUtil.deleteContents(outFile);
return;
}
if (entriesMap.isEmpty()) {
entriesMap = Collections.singletonMap(key, bytes);
} else {
entriesMap.put(key, bytes);
}
try {
writeZipClassBytes(outFile, entriesMap);
} catch(Exception e) {
if ((logger != null) && logger.isTraceEnabled()) {
logger.warn("writeClassBytes(" + outFile + ")[" + key + "]"
+ " failed (" + e.getClass().getSimpleName() + ")"
+ " to write updated data: " + e.getMessage(),
e);
}
FileUtil.deleteContents(outFile);
}
}
@Override
protected void removeClassBytes(String key) throws Exception {
File outFile=getZipFile();
Map entriesMap;
try {
entriesMap = readZipClassBytes(outFile);
} catch(Exception e) {
if ((logger != null) && logger.isTraceEnabled()) {
logger.warn("removeClassBytes(" + outFile + ")[" + key + "]"
+ " failed (" + e.getClass().getSimpleName() + ")"
+ " to read current data: " + e.getMessage(),
e);
}
FileUtil.deleteContents(outFile);
return;
}
if (!entriesMap.isEmpty()) {
if (entriesMap.remove(key) == null) {
return; // not in the data file to begin with so nothing to update
}
}
try {
writeZipClassBytes(outFile, entriesMap);
} catch(Exception e) {
if ((logger != null) && logger.isTraceEnabled()) {
logger.warn("removeClassBytes(" + outFile + ")[" + key + "]"
+ " failed (" + e.getClass().getSimpleName() + ")"
+ " to write updated data: " + e.getMessage(),
e);
}
FileUtil.deleteContents(outFile);
}
}
@Override
protected Map readClassBytes(Map indexMap, File cacheDir) {
File dataFile=new File(cacheDir, ZIP_FILE);
Map entriesMap;
boolean okEntries=true;
try {
entriesMap = readZipClassBytes(dataFile);
} catch(Exception e) {
if ((logger != null) && logger.isTraceEnabled()) {
logger.warn("Failed (" + e.getClass().getSimpleName() + ")"
+ " to read zip entries from " + dataFile
+ ": " + e.getMessage(),
e);
}
entriesMap = new TreeMap<>();
okEntries = false;
}
if (!syncClassBytesEntries(dataFile, indexMap, entriesMap)) {
okEntries = false;
}
if (!okEntries) {
FileUtil.deleteContents(dataFile);
if (!entriesMap.isEmpty()) {
entriesMap.clear();
}
}
syncIndexEntries(dataFile, indexMap, entriesMap);
return entriesMap;
}
// remove all non-ignored entries that have no class bytes
protected Collection syncIndexEntries (File dataFile, Map indexMap, Map entriesMap) {
Collection toDelete=null;
for (Map.Entry ie : indexMap.entrySet()) {
String key=ie.getKey();
IndexEntry indexEntry=ie.getValue();
if (indexEntry.ignored) {
continue; // ignored entries have no class bytes
}
if (entriesMap.containsKey(key)) {
continue;
}
if ((logger != null) && logger.isTraceEnabled()) {
logger.debug("syncIndexEntries(" + dataFile + ")[" + key + "] no class bytes");
}
if (toDelete == null) {
toDelete = new TreeSet<>();
}
toDelete.add(key);
}
if (toDelete == null) {
return Collections.emptySet();
}
for (String key : toDelete) {
indexMap.remove(key);
}
return toDelete;
}
// check if all class bytes entries are valid
protected boolean syncClassBytesEntries (File dataFile, Map indexMap, Map entriesMap) {
boolean okEntries=true;
for (Map.Entry bytesEntry : entriesMap.entrySet()) {
String key=bytesEntry.getKey();
IndexEntry indexEntry=indexMap.get(key);
// ignored entries should have no bytes
if ((indexEntry == null) || indexEntry.ignored) {
if ((logger != null) && logger.isTraceEnabled()) {
logger.debug("syncClassBytesEntries(" + dataFile + ")[" + key + "] bad index entry");
}
okEntries = false;
continue;
}
long crc=crc(bytesEntry.getValue());
if (crc != indexEntry.crcWeaved) {
if ((logger != null) && logger.isTraceEnabled()) {
logger.debug("syncClassBytesEntries(" + dataFile + ")[" + key + "]"
+ " mismatched CRC - expected=" + indexEntry.crcWeaved + "/got=" + crc);
}
indexMap.remove(key);
okEntries = false;
continue;
}
}
return okEntries;
}
@Override
protected IndexEntry resolveIndexMapEntry(File cacheDir, IndexEntry ie) {
if (cacheDir.exists()) {
return ie; // we will take care of non-existing index entries in the readClassBytes method
} else {
return null;
}
}
public static final Map readZipClassBytes (File file) throws IOException {
if (!file.canRead()) {
return Collections.emptyMap();
}
Map result= new TreeMap<>();
byte[] copyBuf=new byte[4096];
ByteArrayOutputStream out=new ByteArrayOutputStream(copyBuf.length);
ZipFile zipFile=new ZipFile(file);
try {
for (Enumeration entries=zipFile.entries(); (entries != null) && entries.hasMoreElements(); ) {
ZipEntry e=entries.nextElement();
String name=e.getName();
if (LangUtil.isEmpty(name)) {
continue;
}
out.reset();
InputStream zipStream=zipFile.getInputStream(e);
try {
for (int nRead=zipStream.read(copyBuf); nRead != (-1); nRead=zipStream.read(copyBuf)) {
out.write(copyBuf, 0, nRead);
}
} finally {
zipStream.close();
}
byte[] data=out.toByteArray(), prev=result.put(name, data);
if (prev != null) {
throw new StreamCorruptedException("Multiple entries for " + name);
}
}
} finally {
zipFile.close();
}
return result;
}
public static final void writeZipClassBytes (File file, Map entriesMap) throws IOException {
if (entriesMap.isEmpty()) {
FileUtil.deleteContents(file);
return;
}
File zipDir=file.getParentFile();
if ((!zipDir.exists()) && (!zipDir.mkdirs())) {
throw new IOException("Failed to create path to " + zipDir.getAbsolutePath());
}
ZipOutputStream zipOut=new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(file), 4096));
try {
for (Map.Entry bytesEntry : entriesMap.entrySet()) {
String key=bytesEntry.getKey();
byte[] bytes=bytesEntry.getValue();
zipOut.putNextEntry(new ZipEntry(key));
zipOut.write(bytes);
zipOut.closeEntry();
}
} finally {
zipOut.close();
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy