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* General Public License Version 2 only ("GPL") or the Common
* Development and Distribution License("CDDL") (collectively, the
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package org.netbeans.lib.profiler.heap;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.util.zip.GZIPInputStream;
import org.gridkit.jvmtool.heapdump.io.ByteBufferPageManager;
import org.gridkit.jvmtool.heapdump.io.CompressdHprofByteBuffer;
import org.gridkit.jvmtool.heapdump.io.PagedFileHprofByteBuffer;
/**
* This is factory class for creating {@link Heap} from the file in Hprof dump format.
* @author Tomas Hurka
*/
public class HeapFactory {
public static final long DEFAULT_BUFFER = 128 << 20;
//~ Methods ------------------------------------------------------------------------------------------------------------------
/**
* this factory method creates {@link Heap} from a memory dump file in Hprof format.
*
* This implementation is using temporary disk files for building auxiliary indexes
*
* Speed: slow
* @param heapDump file which contains memory dump
* @return implementation of {@link Heap} corresponding to the memory dump
* passed in heapDump parameter
* @throws java.io.FileNotFoundException if heapDump file does not exist
* @throws java.io.IOException if I/O error occurred while accessing heapDump file
*/
public static Heap createHeap(File heapDump) throws FileNotFoundException, IOException {
return createHeap(heapDump, 0);
}
/**
* Fast {@link Heap} implementation is optimized for batch processing of dump.
* Unlike normal {@link Heap} it doesn't create/use any temporary files.
*/
public static Heap createFastHeap(File heapDump) throws FileNotFoundException, IOException {
return createFastHeap(heapDump, DEFAULT_BUFFER);
}
/**
* Fast {@link Heap} implementation is optimized for batch processing of dump.
* Unlike normal {@link Heap} it doesn't create/use any temporary files.
*
* @param bufferSize if file can be mapped to memory no buffer would be used, overwise limits memory used for buffering
*/
public static Heap createFastHeap(File heapDump, long bufferSize) throws FileNotFoundException, IOException {
return new FastHprofHeap(createBuffer(heapDump, bufferSize), 0);
}
/**
* this factory method creates {@link Heap} from a memory dump file in Hprof format.
* If the memory dump file contains more than one dump, parameter segment is used to
* select particular dump.
*
* This implementation is using temporary disk files for building auxiliary indexes
*
* Speed: slow
* @return implementation of {@link Heap} corresponding to the memory dump
* passed in heapDump parameter
* @param segment select corresponding dump from multi-dump file
* @param heapDump file which contains memory dump
* @throws java.io.FileNotFoundException if heapDump file does not exist
* @throws java.io.IOException if I/O error occurred while accessing heapDump file
*/
public static Heap createHeap(File heapDump, int segment)
throws FileNotFoundException, IOException {
return new HprofHeap(createBuffer(heapDump, DEFAULT_BUFFER), segment);
}
public static boolean canBeMemMapped(File heapDump) {
try {
if (isGZIP(heapDump)) {
return false;
}
}
catch(NoClassDefFoundError e) {
// GZip parser is not available
}
try {
FileInputStream fis = new FileInputStream(heapDump);
FileChannel channel = fis.getChannel();
long length = channel.size();
int bufCount = (int)((length + ((1 << 30) - 1)) >> 30);
MappedByteBuffer[] buffers = new MappedByteBuffer[bufCount];
try {
for(int i = 0; i != bufCount; ++i) {
long rm = length - (((long)i) << 30);
buffers[i] = channel.map(FileChannel.MapMode.READ_ONLY, ((long)i) << 30, Math.min(rm, 1 << 30));
}
return true;
}
catch(Exception e) {
// ignore
}
finally {
try {
channel.close();
}
catch(Exception e) {
// ignore
}
try {
fis.close();
}
catch(Exception e) {
// ignore
}
for(MappedByteBuffer mb: buffers) {
try {
callCleaner(mb);
}
catch(Exception e) {
// ignore
}
}
}
} catch (FileNotFoundException e) {
// ignore
} catch (IOException e) {
// ignore
}
return false;
}
private static void callCleaner(MappedByteBuffer dumpBuffer) {
Object c = rcall(dumpBuffer, "cleaner");
rcall(c, "clean");
}
private static Object rcall(Object o, String method, Object... args) {
try {
Class c = o.getClass();
Method m = getMethod(c, method);
m.setAccessible(true);
return m.invoke(o, args);
} catch (SecurityException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e.getTargetException());
}
}
private static Method getMethod(Class c, String method) {
for(Method m: c.getDeclaredMethods()) {
if (m.getName().equals(method)) {
return m;
}
}
if (c.getSuperclass() != null) {
return getMethod(c.getSuperclass(), method);
}
return null;
}
private static HprofByteBuffer createBuffer(File heapDump, long bufferSize) throws IOException {
try {
if (isGZIP(heapDump)) {
return createCompressedHprofBuffer(heapDump, bufferSize);
}
}
catch(NoClassDefFoundError e) {
// GZip parser is not available
}
HprofByteBuffer bb = HeapFactory.createHprofByteBuffer(heapDump, bufferSize);
return bb;
}
private static HprofByteBuffer createCompressedHprofBuffer(File heapDump, long bufferSize) throws IOException, FileNotFoundException {
return new CompressdHprofByteBuffer(new RandomAccessFile(heapDump, "r"), new ByteBufferPageManager(512 << 10, bufferSize));
}
private static boolean isGZIP(File headDump) {
try {
FileInputStream in = new FileInputStream(headDump);
GZIPInputStream is;
try {
is = new GZIPInputStream(in);
is.read();
is.close();
return true;
} catch (IOException e) {
in.close();
}
} catch (IOException e) {
// ignore
}
return false;
}
static HprofByteBuffer createHprofByteBuffer(File dumpFile, long bufferSize)
throws IOException {
long fileLen = dumpFile.length();
if (fileLen < HprofByteBuffer.MINIMAL_SIZE) {
String errText = "File size is too small";
throw new IOException(errText);
}
try {
if (fileLen < Integer.MAX_VALUE) {
return new HprofMappedByteBuffer(dumpFile);
} else {
return new HprofLongMappedByteBuffer(dumpFile);
}
} catch (IOException ex) {
if (ex.getCause() instanceof OutOfMemoryError) { // can happen on 32bit Windows, since there is only 2G for memory mapped data for whole java process.
return new PagedFileHprofByteBuffer(new RandomAccessFile(dumpFile, "r"), new ByteBufferPageManager(1 << 20, 1 << 20, bufferSize));
}
throw ex;
}
}
}
