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CacheDirectory.java
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CacheDirectory.java
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/*
* Copyright (c) 2017, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package org.graalvm.visualvm.lib.jfluid.heap;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
*
* @author Tomas Hurka
*/
class CacheDirectory {
private static final String DIR_EXT = ".hwcache"; // NOI18N
private static final String DUMP_AUX_FILE = "NBProfiler.nphd"; // NOI18N
private static final String DIRTY_FILENAME = "dirty.lck"; // NOI18N
private File cacheDirectory;
static CacheDirectory getHeapDumpCacheDirectory(File heapDump, int seg) {
String dumpName = heapDump.getName();
String suffix = seg==0 ? "" : "_"+seg;
File parent = heapDump.getParentFile();
File dir = new File(parent, dumpName+suffix+DIR_EXT);
return new CacheDirectory(dir);
}
CacheDirectory(File cacheDir) {
cacheDirectory = cacheDir;
if (cacheDir != null) {
if (!cacheDir.exists()) {
if (!cacheDir.mkdir()) {
cacheDirectory = null;
}
}
}
if (cacheDirectory != null) {
assert cacheDirectory.isDirectory() && cacheDirectory.canRead() && cacheDirectory.canWrite();
}
}
File createTempFile(String prefix, String suffix) throws IOException {
File newFile;
if (isTemporary()) {
newFile = File.createTempFile(prefix, suffix);
newFile.deleteOnExit();
} else {
newFile = File.createTempFile(prefix, suffix, cacheDirectory);
}
return newFile;
}
File getHeapDumpAuxFile() {
assert !isTemporary();
return new File(cacheDirectory, DUMP_AUX_FILE);
}
boolean isTemporary() {
return cacheDirectory == null;
}
File getCacheFile(String fileName) throws FileNotFoundException {
File file = lookupFile(fileName, false);
if (file.canWrite()) {
return file;
}
throw new FileNotFoundException(fileName);
}
File getHeapFile(String fileName) throws FileNotFoundException {
return lookupFile(fileName, true);
}
void deleteAllCachedFiles() {
assert !isTemporary();
for (File f : cacheDirectory.listFiles()) {
f.delete();
}
}
boolean isDirty() {
if (isTemporary()) return true;
File dirtyFile = new File(cacheDirectory,DIRTY_FILENAME);
return isFileR(dirtyFile);
}
void setDirty(boolean dirty) {
if (!isTemporary()) {
File dirtyFile = new File(cacheDirectory, DIRTY_FILENAME);
try {
if (dirty) {
assert !isFileR(dirtyFile);
dirtyFile.createNewFile();
} else {
assert isFileRW(dirtyFile);
dirtyFile.delete();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
HprofByteBuffer createHprofByteBuffer(File dumpFile) throws IOException{
return HprofByteBuffer.createHprofByteBuffer(dumpFile);
}
AbstractLongMap.Data createDumpBuffer(long fileSize, int entrySize) throws IOException {
File tempFile = createTempFile("NBProfiler", ".map"); // NOI18N
try (RandomAccessFile file = new RandomAccessFile(tempFile, "rw")) { // NOI18N
if (Boolean.getBoolean("org.graalvm.visualvm.lib.jfluid.heap.zerofile")) { // NOI18N
byte[] zeros = new byte[512*1024];
while(file.length()<fileSize) {
file.write(zeros);
}
file.write(zeros,0,(int)(fileSize-file.length()));
}
file.setLength(fileSize);
return AbstractLongMap.getDumpBuffer(tempFile, file, entrySize);
}
}
NumberList createNumberList(int idSize) throws IOException {
return new NumberList(idSize, this);
}
private File lookupFile(String fileName, boolean checkParent) throws FileNotFoundException {
File f = new File(fileName);
if (isFileR(f)) {
return f;
}
// try to find file next to cache directory or in cache directory
File dir = checkParent ? cacheDirectory.getParentFile() : cacheDirectory;
f = new File(dir, f.getName());
if (isFileR(f)) {
return f;
}
if (!fileName.contains(File.separator)) {
// OS mismatch, try opposite separator
char sep = File.separatorChar == '/' ? '\\' : '/'; // NOI18N
int lastSep = fileName.lastIndexOf(sep);
if (lastSep != -1) {
f = new File(dir, fileName.substring(lastSep+1));
if (isFileR(f)) {
return f;
}
}
}
throw new FileNotFoundException(fileName);
}
private static boolean isFileR(File f) {
return f.exists() && f.isFile() && f.canRead();
}
private static boolean isFileRW(File f) {
return isFileR(f) && f.canWrite();
}
private static boolean isLinux() {
String osName = System.getProperty("os.name"); // NOI18N
return osName.endsWith("Linux"); // NOI18N
}
}