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package org.netbeans.lib.profiler.heap;
import java.io.EOFException;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
*
* @author Tomas Hurka
*/
class HprofFileBuffer extends HprofByteBuffer {
//~ Static fields/initializers -----------------------------------------------------------------------------------------------
private static final int MAX_bufferSizeBits = 17;
private static final int MIN_bufferSizeBits = 7;
private static final int MIN_bufferSize = 1 << MIN_bufferSizeBits;
private static final int MIN_bufferSizeMask = MIN_bufferSize - 1;
private static final int BUFFER_EXT = 8;
//~ Instance fields ----------------------------------------------------------------------------------------------------------
RandomAccessFile fis;
private byte[] dumpBuffer;
private long bufferStartOffset;
private int bufferSizeBits;
private int bufferSize;
//~ Constructors -------------------------------------------------------------------------------------------------------------
HprofFileBuffer(File dumpFile) throws IOException {
fis = new RandomAccessFile(dumpFile, "r");
length = fis.length();
bufferStartOffset = Long.MAX_VALUE;
readHeader();
}
//~ Methods ------------------------------------------------------------------------------------------------------------------
synchronized char getChar(long index) {
int i = loadBufferIfNeeded(index);
int ch1 = ((int) dumpBuffer[i++]) & 0xFF;
int ch2 = ((int) dumpBuffer[i]) & 0xFF;
return (char) ((ch1 << 8) + (ch2 << 0));
}
synchronized double getDouble(long index) {
int i = loadBufferIfNeeded(index);
return Double.longBitsToDouble(getLong(i));
}
synchronized float getFloat(long index) {
int i = loadBufferIfNeeded(index);
return Float.intBitsToFloat(getInt(i));
}
synchronized int getInt(long index) {
int i = loadBufferIfNeeded(index);
int ch1 = ((int) dumpBuffer[i++]) & 0xFF;
int ch2 = ((int) dumpBuffer[i++]) & 0xFF;
int ch3 = ((int) dumpBuffer[i++]) & 0xFF;
int ch4 = ((int) dumpBuffer[i]) & 0xFF;
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
}
synchronized long getLong(long index) {
return ((long) (getInt(index)) << 32) + (getInt(index + 4) & 0xFFFFFFFFL);
}
synchronized short getShort(long index) {
int i = loadBufferIfNeeded(index);
int ch1 = ((int) dumpBuffer[i++]) & 0xFF;
int ch2 = ((int) dumpBuffer[i]) & 0xFF;
return (short) ((ch1 << 8) + (ch2 << 0));
}
// delegate to MappedByteBuffer
synchronized byte get(long index) {
int i = loadBufferIfNeeded(index);
return dumpBuffer[i];
}
synchronized void get(long position, byte[] chars) {
int i = loadBufferIfNeeded(position);
if ((i + chars.length) < dumpBuffer.length) {
System.arraycopy(dumpBuffer, i, chars, 0, chars.length);
} else {
try {
fis.seek(position);
fis.readFully(chars);
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
private void setBufferSize(long newBufferStart) {
if ((newBufferStart > bufferStartOffset) && (newBufferStart < (bufferStartOffset + (2 * bufferSize)))) { // sequential read -> increase buffer size
if (bufferSizeBits < MAX_bufferSizeBits) {
setBufferSize(bufferSizeBits + 1);
}
} else { // reset buffer size
setBufferSize(MIN_bufferSizeBits);
}
}
private void setBufferSize(int newBufferSizeBits) {
bufferSizeBits = newBufferSizeBits;
bufferSize = 1 << bufferSizeBits;
dumpBuffer = new byte[bufferSize + BUFFER_EXT];
}
private int loadBufferIfNeeded(long index) {
if ((index >= bufferStartOffset) && (index < (bufferStartOffset + bufferSize))) {
return (int) (index - bufferStartOffset);
}
long newBufferStart = index & ~MIN_bufferSizeMask;
setBufferSize(newBufferStart);
try {
fis.seek(newBufferStart);
fis.readFully(dumpBuffer);
//System.out.println("Reading at "+newBufferStart+" size "+dumpBuffer.length+" thread "+Thread.currentThread().getName());
} catch (EOFException ex) {
// ignore
} catch (IOException ex) {
ex.printStackTrace();
}
bufferStartOffset = newBufferStart;
return (int) (index - bufferStartOffset);
}
public String toString() {
return "Single buffer, random access strategy";
}
}