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package org.netbeans.lib.profiler.heap;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
* LongBuffer is a special kind of buffer for storing longs. It uses array of longs if there is only few longs
* stored, otherwise longs are saved to backing temporary file.
* @author Tomas Hurka
*/
class LongBuffer {
//~ Instance fields ----------------------------------------------------------------------------------------------------------
private DataInputStream readStream;
private boolean readStreamClosed;
private DataOutputStream writeStream;
private File backingFile;
private long[] buffer;
private boolean useBackingFile;
private int bufferSize;
private int readOffset;
private int longs;
//~ Constructors -------------------------------------------------------------------------------------------------------------
LongBuffer(int size) {
buffer = new long[size];
}
//~ Methods ------------------------------------------------------------------------------------------------------------------
void delete() {
if (backingFile != null) {
backingFile.delete();
}
}
boolean hasData() {
return longs > 0;
}
long readLong() throws IOException {
if (!useBackingFile) {
if (readOffset < bufferSize) {
return buffer[readOffset++];
} else {
return 0;
}
}
if (readStreamClosed) {
return 0;
}
try {
return readStream.readLong();
} catch (EOFException ex) {
readStreamClosed = true;
readStream.close();
return 0L;
}
}
void reset() throws IOException {
bufferSize = 0;
if (writeStream != null) {
writeStream.close();
}
if (readStream != null) {
readStream.close();
}
writeStream = null;
readStream = null;
readStreamClosed = false;
longs = 0;
useBackingFile = false;
readOffset = 0;
}
void startReading() {
if (useBackingFile) {
try {
writeStream.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
writeStream = null;
rewind();
}
void rewind() {
readOffset = 0;
if (useBackingFile) {
try {
if (readStream != null) {
readStream.close();
}
readStream = new DataInputStream(new BufferedInputStream(new FileInputStream(backingFile), buffer.length * 8));
readStreamClosed = false;
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
void writeLong(long data) throws IOException {
longs++;
if (bufferSize < buffer.length) {
buffer[bufferSize++] = data;
return;
}
if (backingFile == null) {
backingFile = File.createTempFile("NBProfiler", ".gc"); // NOI18N
backingFile.deleteOnExit();
}
if (writeStream == null) {
writeStream = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(backingFile), buffer.length * 8));
for (int i = 0; i < buffer.length; i++) {
writeStream.writeLong(buffer[i]);
}
useBackingFile = true;
}
writeStream.writeLong(data);
}
LongBuffer revertBuffer() throws IOException {
LongBuffer reverted = new LongBuffer(buffer.length);
if (bufferSize < buffer.length) {
for (int i=0;i<bufferSize;i++) {
reverted.writeLong(buffer[bufferSize - 1 - i]);
}
} else {
writeStream.flush();
RandomAccessFile raf = new RandomAccessFile(backingFile,"r");
long offset = raf.length();
while(offset > 0) {
offset-=8;
raf.seek(offset);
reverted.writeLong(raf.readLong());
}
}
reverted.startReading();
return reverted;
}
int getSize() {
return longs;
}
}