org.aspectj.weaver.bcel.ClassPathManager 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 introduces advices to java classes
/* *******************************************************************
* Copyright (c) 2002, 2017 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://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Palo Alto Research Center, Incorporated (PARC).
* ******************************************************************/
package org.aspectj.weaver.bcel;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.aspectj.bridge.IMessageHandler;
import org.aspectj.bridge.MessageUtil;
import org.aspectj.util.LangUtil;
import org.aspectj.util.SoftHashMap;
import org.aspectj.weaver.BCException;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.WeaverMessages;
import org.aspectj.weaver.tools.Trace;
import org.aspectj.weaver.tools.TraceFactory;
/**
* @author Andy Clement
* @author Mario Ivankovits
*/
public class ClassPathManager {
private static Trace trace = TraceFactory.getTraceFactory().getTrace(ClassPathManager.class);
private static int maxOpenArchives = -1;
private static URI JRT_URI = URI.create("jrt:/"); //$NON-NLS-1$
private static final int MAXOPEN_DEFAULT = 1000;
private List entries;
// In order to control how many open files we have, we maintain a list.
// The max number is configured through the property:
// org.aspectj.weaver.openarchives
// and it defaults to 1000
private List openArchives = new ArrayList();
static {
String openzipsString = getSystemPropertyWithoutSecurityException("org.aspectj.weaver.openarchives",
Integer.toString(MAXOPEN_DEFAULT));
maxOpenArchives = Integer.parseInt(openzipsString);
if (maxOpenArchives < 20) {
maxOpenArchives = 1000;
}
}
public ClassPathManager(List classpath, IMessageHandler handler) {
if (trace.isTraceEnabled()) {
trace.enter("", this, new Object[] { classpath==null?"null":classpath.toString(), handler });
}
entries = new ArrayList();
for (String classpathEntry: classpath) {
addPath(classpathEntry,handler);
}
if (trace.isTraceEnabled()) {
trace.exit("");
}
}
protected ClassPathManager() {
}
public void addPath(String name, IMessageHandler handler) {
File f = new File(name);
String lc = name.toLowerCase();
if (!f.isDirectory()) {
if (!f.isFile()) {
if (!lc.endsWith(".jar") || lc.endsWith(".zip")) {
// heuristic-only: ending with .jar or .zip means probably a
// zip file
MessageUtil.info(handler, WeaverMessages.format(WeaverMessages.ZIPFILE_ENTRY_MISSING, name));
} else {
MessageUtil.info(handler, WeaverMessages.format(WeaverMessages.DIRECTORY_ENTRY_MISSING, name));
}
return;
}
try {
if (lc.endsWith(LangUtil.JRT_FS)) { // Java9
entries.add(new JImageEntry());
} else {
entries.add(new ZipFileEntry(f));
}
} catch (IOException ioe) {
MessageUtil.warn(handler,
WeaverMessages.format(WeaverMessages.ZIPFILE_ENTRY_INVALID, name, ioe.getMessage()));
return;
}
} else {
entries.add(new DirEntry(f));
}
}
public ClassFile find(UnresolvedType type) {
if (trace.isTraceEnabled()) {
trace.enter("find", this, type);
}
String name = type.getName();
for (Iterator i = entries.iterator(); i.hasNext();) {
Entry entry = i.next();
try {
ClassFile ret = entry.find(name);
if (trace.isTraceEnabled()) {
trace.event("searching for "+type+" in "+entry.toString());
}
if (ret != null) {
if (trace.isTraceEnabled()) {
trace.exit("find", ret);
}
return ret;
}
} catch (IOException ioe) {
// this is NOT an error: it's valid to have missing classpath entries
if (trace.isTraceEnabled()) {
trace.error("Removing classpath entry for "+entry,ioe);
}
i.remove();
}
}
if (trace.isTraceEnabled()) {
trace.exit("find", null);
}
return null;
}
@Override
public String toString() {
StringBuffer buf = new StringBuffer();
boolean start = true;
for (Iterator i = entries.iterator(); i.hasNext();) {
if (start) {
start = false;
} else {
buf.append(File.pathSeparator);
}
buf.append(i.next());
}
return buf.toString();
}
public abstract static class ClassFile {
public abstract InputStream getInputStream() throws IOException;
public abstract String getPath();
public abstract void close();
}
abstract static class Entry {
public abstract ClassFile find(String name) throws IOException;
}
static class ByteBasedClassFile extends ClassFile {
private byte[] bytes;
private ByteArrayInputStream bais;
private String path;
public ByteBasedClassFile(byte[] bytes, String path) {
this.bytes = bytes;
this.path = path;
}
@Override
public InputStream getInputStream() throws IOException {
this.bais = new ByteArrayInputStream(bytes);
return this.bais;
}
@Override
public String getPath() {
return this.path;
}
@Override
public void close() {
if (this.bais!=null) {
try {
this.bais.close();
} catch (IOException e) {
}
this.bais = null;
}
}
}
static class FileClassFile extends ClassFile {
private File file;
private FileInputStream fis;
public FileClassFile(File file) {
this.file = file;
}
@Override
public InputStream getInputStream() throws IOException {
fis = new FileInputStream(file);
return fis;
}
@Override
public void close() {
try {
if (fis != null)
fis.close();
} catch (IOException ioe) {
throw new BCException("Can't close class file : " + file.getName(), ioe);
} finally {
fis = null;
}
}
@Override
public String getPath() {
return file.getPath();
}
}
class DirEntry extends Entry {
private String dirPath;
public DirEntry(File dir) {
this.dirPath = dir.getPath();
}
public DirEntry(String dirPath) {
this.dirPath = dirPath;
}
@Override
public ClassFile find(String name) {
File f = new File(dirPath + File.separator + name.replace('.', File.separatorChar) + ".class");
if (f.isFile())
return new FileClassFile(f);
else
return null;
}
@Override
public String toString() {
return dirPath;
}
}
static class ZipEntryClassFile extends ClassFile {
private ZipEntry entry;
private ZipFileEntry zipFile;
private InputStream is;
public ZipEntryClassFile(ZipFileEntry zipFile, ZipEntry entry) {
this.zipFile = zipFile;
this.entry = entry;
}
@Override
public InputStream getInputStream() throws IOException {
is = zipFile.getZipFile().getInputStream(entry);
return is;
}
@Override
public void close() {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
is = null;
}
}
@Override
public String getPath() {
return entry.getName();
}
}
/**
* Maintains a shared package cache for java runtime image. This maps packages (for example:
* java/lang) to a starting root position in the filesystem (for example: /modules/java.base/java/lang).
* When searching for a type we work out the package name, use it to find where in the filesystem
* to start looking then run from there. Once found we do cache what we learn to make subsequent
* lookups of that type even faster. Maintaining just a package cache rather than complete type cache
* helps reduce memory usage but still gives reasonably fast lookup performance.
*/
static class JImageEntry extends Entry {
private static FileSystem fs = null;
private final static Map fileCache = new SoftHashMap();
private final static Map packageCache = new HashMap();
private static boolean packageCacheInitialized = false;
public JImageEntry() {
if (fs == null) {
try {
fs = FileSystems.getFileSystem(JRT_URI);
} catch (Throwable t) {
throw new IllegalStateException("Unexpectedly unable to initialize a JRT filesystem", t);
}
}
buildPackageMap();
}
class PackageCacheBuilderVisitor extends SimpleFileVisitor {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
if (file.getNameCount() > 3 && file.toString().endsWith(".class")) {
int fnc = file.getNameCount();
if (fnc > 3) { // There is a package name - e.g. /modules/java.base/java/lang/Object.class
Path packagePath = file.subpath(2, fnc-1); // e.g. java/lang
String packagePathString = packagePath.toString();
packageCache.put(packagePathString, file.subpath(0, fnc-1)); // java/lang -> /modules/java.base/java/lang
}
}
return FileVisitResult.CONTINUE;
}
}
/**
* Create a map from package names to the specific directory of the package members in the filesystem.
*/
private synchronized void buildPackageMap() {
if (!packageCacheInitialized) {
packageCacheInitialized = true;
Iterable roots = fs.getRootDirectories();
PackageCacheBuilderVisitor visitor = new PackageCacheBuilderVisitor();
try {
for (java.nio.file.Path path : roots) {
Files.walkFileTree(path, visitor);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
class TypeIdentifier extends SimpleFileVisitor {
// What are we looking for?
private String name;
// If set, where did we find it?
public Path found;
// Basic metric count of how many files we checked before finding it
public int filesSearchedCount;
public TypeIdentifier(String name) {
this.name = name;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
filesSearchedCount++;
if (file.getNameCount() > 2 && file.toString().endsWith(".class")) {
int fnc = file.getNameCount();
Path filePath = file.subpath(2, fnc);
String filePathString = filePath.toString();
if (filePathString.equals(name)) {
fileCache.put(filePathString, file);
found = file;
return FileVisitResult.TERMINATE;
}
}
return FileVisitResult.CONTINUE;
}
}
private Path searchForFileAndCache(final Path startPath, final String name) {
TypeIdentifier locator = new TypeIdentifier(name);
try {
Files.walkFileTree(startPath, locator);
} catch (IOException e) {
throw new RuntimeException(e);
}
return locator.found;
}
@Override
public ClassFile find(String name) throws IOException {
String fileName = name.replace('.', '/') + ".class";
Path file = fileCache.get(fileName);
if (file == null) {
// Check the packages map to see if we know about this package
int idx = fileName.lastIndexOf('/');
if (idx == -1) {
// Package not here
return null;
}
Path packageStart = null;
String packageName = null;
if (idx !=-1 ) {
packageName = fileName.substring(0, idx);
packageStart = packageCache.get(packageName);
if (packageStart != null) {
file = searchForFileAndCache(packageStart, fileName);
}
}
}
if (file == null) {
return null;
}
byte[] bs = Files.readAllBytes(file);
ClassFile cf = new ByteBasedClassFile(bs, fileName);
return cf;
}
static Map getPackageCache() {
return packageCache;
}
static Map getFileCache() {
return fileCache;
}
}
class ZipFileEntry extends Entry {
private File file;
private ZipFile zipFile;
public ZipFileEntry(File file) throws IOException {
this.file = file;
}
public ZipFileEntry(ZipFile zipFile) {
this.zipFile = zipFile;
}
public ZipFile getZipFile() {
return zipFile;
}
@Override
public ClassFile find(String name) throws IOException {
ensureOpen();
String key = name.replace('.', '/') + ".class";
ZipEntry entry = zipFile.getEntry(key);
if (entry != null)
return new ZipEntryClassFile(this, entry);
else
return null; // This zip will be closed when necessary...
}
public List getAllClassFiles() throws IOException {
ensureOpen();
List ret = new ArrayList();
for (Enumeration e = zipFile.entries(); e.hasMoreElements();) {
ZipEntry entry = e.nextElement();
String name = entry.getName();
if (hasClassExtension(name))
ret.add(new ZipEntryClassFile(this, entry));
}
// if (ret.isEmpty()) close();
return ret;
}
private void ensureOpen() throws IOException {
if (zipFile != null && openArchives.contains(zipFile)) {
if (isReallyOpen())
return;
}
if (openArchives.size() >= maxOpenArchives) {
closeSomeArchives(openArchives.size() / 10); // Close 10% of
// those open
}
zipFile = new ZipFile(file);
if (!isReallyOpen()) {
throw new FileNotFoundException("Can't open archive: " + file.getName() + " (size() check failed)");
}
openArchives.add(zipFile);
}
private boolean isReallyOpen() {
try {
zipFile.size(); // this will fail if the file has been closed
// for
// some reason;
return true;
} catch (IllegalStateException ex) {
// this means the zip file is closed...
return false;
}
}
public void closeSomeArchives(int n) {
for (int i = n - 1; i >= 0; i--) {
ZipFile zf = openArchives.get(i);
try {
zf.close();
} catch (IOException e) {
e.printStackTrace();
}
openArchives.remove(i);
}
}
public void close() {
if (zipFile == null)
return;
try {
openArchives.remove(zipFile);
zipFile.close();
} catch (IOException ioe) {
throw new BCException("Can't close archive: " + file.getName(), ioe);
} finally {
zipFile = null;
}
}
@Override
public String toString() {
return file.getName();
}
}
/* private */static boolean hasClassExtension(String name) {
return name.toLowerCase().endsWith((".class"));
}
public void closeArchives() {
for (Entry entry : entries) {
if (entry instanceof ZipFileEntry) {
((ZipFileEntry) entry).close();
}
openArchives.clear();
}
}
// Copes with the security manager
private static String getSystemPropertyWithoutSecurityException(String aPropertyName, String aDefaultValue) {
try {
return System.getProperty(aPropertyName, aDefaultValue);
} catch (SecurityException ex) {
return aDefaultValue;
}
}
// Mainly exposed for testing
public List getEntries() {
return entries;
}
}