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package org.netbeans.lib.profiler.heap;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* key - ID (long/int) of heap object
* value (8/4) + 4 + 1 + (8/4)
* - offset (long/int) to dump file
* - instance index (int) - unique number of this {@link Instance} among all instances of the same Java Class
* - references flags (byte) - bit 0 set - has zero or one reference,
* - bit 1 set - has GC root
* - bit 2 set - tree object
* - ID/offset (long/int) - ID if reference flag bit 0 is set, otherwise offset to reference list file
* - retained size (long/int)
*
* @author Tomas Hurka
*/
class LongMap extends AbstractLongMap {
private NumberList referenceList;
//~ Inner Classes ------------------------------------------------------------------------------------------------------------
class Entry extends AbstractLongMap.Entry {
private static final byte NUMBER_LIST = 1;
private static final byte GC_ROOT = 2;
private static final byte TREE_OBJ = 4;
//~ Instance fields ------------------------------------------------------------------------------------------------------
private long offset;
//~ Constructors ---------------------------------------------------------------------------------------------------------
private Entry(long off) {
offset = off;
}
private Entry(long off,long value) {
offset = off;
putFoffset(offset + KEY_SIZE, value);
}
//~ Methods --------------------------------------------------------------------------------------------------------------
void setIndex(int index) {
dumpBuffer.putInt(offset + KEY_SIZE + FOFFSET_SIZE, index);
}
int getIndex() {
return dumpBuffer.getInt(offset + KEY_SIZE + FOFFSET_SIZE);
}
void setTreeObj() {
byte flags = (byte)(getFlags() | TREE_OBJ);
setFlags(flags);
}
boolean isTreeObj() {
return (getFlags() & TREE_OBJ) != 0;
}
boolean hasOnlyOneReference() {
return (getFlags() & NUMBER_LIST) == 0;
}
void setNearestGCRootPointer(long instanceId) {
byte flags = (byte)(getFlags() | GC_ROOT);
setFlags(flags);
if ((flags & NUMBER_LIST) != 0) { // put GC root pointer on the first place in references list
try {
referenceList.putFirst(getReferencesPointer(),instanceId);
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
long getNearestGCRootPointer() {
try {
byte flag = getFlags();
if ((flag & GC_ROOT) != 0) { // has GC root pointer
long ref = getReferencesPointer();
if ((flag & NUMBER_LIST) != 0) { // get GC root pointer from number list
return referenceList.getFirstNumber(ref);
}
return ref;
}
} catch (IOException ex) {
ex.printStackTrace();
}
return 0L;
}
void addReference(long instanceId) {
try {
byte flags = getFlags();
long ref = getReferencesPointer();
if ((flags & NUMBER_LIST) == 0) { // reference list is not used
if (ref == 0L) { // no reference was set
setReferencesPointer(instanceId);
} else if (ref != instanceId) { // one reference was set, switch to reference list
setFlags((byte)(flags | NUMBER_LIST));
long list = referenceList.addFirstNumber(ref,instanceId);
setReferencesPointer(list);
}
} else { // use reference list
long newRef = referenceList.addNumber(ref,instanceId);
if (newRef != ref) {
setReferencesPointer(newRef);
}
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
List<Long> getReferences() {
byte flags = getFlags();
long ref = getReferencesPointer();
if ((flags & NUMBER_LIST) == 0) {
if (ref == 0L) {
return Collections.<Long>emptyList();
} else {
return Collections.singletonList(new Long(ref));
}
} else {
try {
return referenceList.getNumbers(ref);
} catch (IOException ex) {
ex.printStackTrace();
}
}
return Collections.<Long>emptyList();
}
long getOffset() {
return getFoffset(offset + KEY_SIZE);
}
void setRetainedSize(long size) {
if (FOFFSET_SIZE == 4) {
dumpBuffer.putInt(offset + KEY_SIZE + FOFFSET_SIZE + 4 + 1 + ID_SIZE, (int)size);
} else {
dumpBuffer.putLong(offset + KEY_SIZE + FOFFSET_SIZE + 4 + 1 + ID_SIZE, size);
}
}
long getRetainedSize() {
if (FOFFSET_SIZE == 4) {
return dumpBuffer.getInt(offset + KEY_SIZE + FOFFSET_SIZE + 4 + 1 + ID_SIZE);
}
return dumpBuffer.getLong(offset + KEY_SIZE + FOFFSET_SIZE + 4 + 1 + ID_SIZE);
}
private void setReferencesPointer(long instanceId) {
putID(offset + KEY_SIZE + FOFFSET_SIZE + 4 + 1, instanceId);
}
private long getReferencesPointer() {
return getID(offset + KEY_SIZE + FOFFSET_SIZE + 4 + 1);
}
private void setFlags(byte flags) {
dumpBuffer.putByte(offset + KEY_SIZE + FOFFSET_SIZE + 4, flags);
}
private byte getFlags() {
return dumpBuffer.getByte(offset + KEY_SIZE + FOFFSET_SIZE + 4);
}
}
private static class RetainedSizeEntry implements Comparable<RetainedSizeEntry> {
private final long instanceId;
private final long retainedSize;
private RetainedSizeEntry(long id,long size) {
instanceId = id;
retainedSize = size;
}
public int compareTo(RetainedSizeEntry o) {
RetainedSizeEntry other = (RetainedSizeEntry) o;
// bigger object are at beginning
int diff = longCompare(other.retainedSize, retainedSize);
if (diff == 0) {
// sizes are the same, compare ids
return longCompare(instanceId, other.instanceId);
}
return diff;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final RetainedSizeEntry other = (RetainedSizeEntry) obj;
return this.instanceId == other.instanceId;
}
@Override
public int hashCode() {
int hash = 7;
hash = 31 * hash + (int) (this.instanceId ^ (this.instanceId >>> 32));
return hash;
}
}
//~ Constructors -------------------------------------------------------------------------------------------------------------
LongMap(int size,int idSize,int foffsetSize) throws FileNotFoundException, IOException {
super(size,idSize,foffsetSize,foffsetSize + 4 + 1 + idSize + foffsetSize);
referenceList = new NumberList(ID_SIZE);
}
//~ Methods ------------------------------------------------------------------------------------------------------------------
Entry createEntry(long index) {
return new Entry(index);
}
Entry createEntry(long index,long value) {
return new Entry(index,value);
}
Entry get(long key) {
return (Entry)super.get(key);
}
Entry put(long key, long value) {
return (Entry)super.put(key,value);
}
void flush() {
referenceList.flush();
}
long[] getBiggestObjectsByRetainedSize(int number) {
SortedSet<RetainedSizeEntry> bigObjects = new TreeSet<RetainedSizeEntry>();
long[] bigIds = new long[number];
long min = 0;
for (long index=0;index<fileSize;index+=ENTRY_SIZE) {
long id = getID(index);
if (id != 0) {
long retainedSize = createEntry(index).getRetainedSize();
if (bigObjects.size()<number) {
bigObjects.add(new RetainedSizeEntry(id,retainedSize));
min = ((RetainedSizeEntry)bigObjects.last()).retainedSize;
} else if (retainedSize>min) {
bigObjects.remove(bigObjects.last());
bigObjects.add(new RetainedSizeEntry(id,retainedSize));
min = ((RetainedSizeEntry)bigObjects.last()).retainedSize;
}
}
}
int i = 0;
Iterator<RetainedSizeEntry> it = bigObjects.iterator();
while(it.hasNext()) {
bigIds[i++]=((RetainedSizeEntry)it.next()).instanceId;
}
return bigIds;
}
private static int longCompare(long x, long y) {
return (x < y) ? -1 : ((x == y) ? 0 : 1);
}
}