/*
* Created on Nov 4, 2008
* Created by Paul Gardner
*
* Copyright 2008 Vuze, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License only.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
package org.gudy.azureus2.core3.util;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.disk.DiskManager;
import org.gudy.azureus2.core3.logging.LogAlert;
import org.gudy.azureus2.core3.logging.Logger;
import com.aelitis.azureus.core.diskmanager.cache.CacheFileManager;
import com.aelitis.azureus.core.diskmanager.cache.CacheFileManagerFactory;
import com.aelitis.azureus.core.diskmanager.cache.CacheFileManagerStats;
public class
DirectByteBufferPoolReal
extends DirectByteBufferPool
{
private static final boolean disable_gc = System.getProperty( "az.disable.explicit.gc", "0" ).equals( "1" );
static{
if ( disable_gc ){
System.out.println( "Explicit GC disabled" );
}
}
protected static final boolean DEBUG_TRACK_HANDEDOUT = AEDiagnostics.TRACE_DBB_POOL_USAGE;
protected static final boolean DEBUG_PRINT_MEM = AEDiagnostics.PRINT_DBB_POOL_USAGE;
protected static final int DEBUG_PRINT_TIME = 120 * 1000;
protected static final boolean DEBUG_HANDOUT_SIZES = false;
protected static final boolean DEBUG_FREE_SIZES = false;
// There is no point in allocating buffers smaller than 4K,
// as direct ByteBuffers are page-aligned to the underlying
// system, which is 4096 byte pages under most OS's.
// If we want to save memory, we can distribute smaller-than-4K
// buffers by using the slice() method to break up a standard buffer
// into smaller chunks, but that's more work.
private static final int START_POWER = 12; // 4096
private static final int END_POWER = 25; // 33554432
// without an extra bucket here we get lots of wastage with the file cache as typically
// 16K data reads result in a buffer slightly bigger than 16K due to protocol header
// This means we would bump up to 32K pool entries, hence wasting 16K per 16K entry
private static final int[] EXTRA_BUCKETS = { DiskManager.BLOCK_SIZE + 128 };
public static final int MAX_SIZE = BigInteger.valueOf(2).pow(END_POWER).intValue();
private static final DirectByteBufferPoolReal pool = new DirectByteBufferPoolReal();
private final Map buffersMap = new LinkedHashMap(END_POWER - START_POWER + 1);
private final Object poolsLock = new Object();
private static final int SLICE_END_SIZE = 2048;
private static final int SLICE_ALLOC_CHUNK_SIZE = 4096;
private static final short[] SLICE_ENTRY_SIZES = { 8, 16, 32, 64, 128, 256, 512, 1024, SLICE_END_SIZE };
private static final short[] SLICE_ALLOC_MAXS = { 256, 256, 128, 64, 64, 64, 64, 64, 64 };
private static final short[] SLICE_ENTRY_ALLOC_SIZES = new short[SLICE_ENTRY_SIZES.length];
private static final List[] slice_entries = new List[SLICE_ENTRY_SIZES.length];
private static final boolean[][] slice_allocs = new boolean[SLICE_ENTRY_SIZES.length][];
private static final boolean[] slice_alloc_fails = new boolean[SLICE_ENTRY_SIZES.length];
static{
int mult = COConfigurationManager.getIntParameter( "memory.slice.limit.multiplier" );
if ( mult > 1 ){
for (int i=0;i<SLICE_ALLOC_MAXS.length;i++){
SLICE_ALLOC_MAXS[i] *= mult;
}
}
for (int i=0;i<SLICE_ENTRY_SIZES.length;i++){
SLICE_ENTRY_ALLOC_SIZES[i] = (short)(SLICE_ALLOC_CHUNK_SIZE/SLICE_ENTRY_SIZES[i]);
slice_allocs[i] = new boolean[SLICE_ALLOC_MAXS[i]];
slice_entries[i] = new LinkedList();
}
}
private static final long[] slice_use_count = new long[SLICE_ENTRY_SIZES.length];
private final Map handed_out = new IdentityHashMap(); // for debugging (ByteBuffer has .equals defined on contents, hence IdentityHashMap)
private final Map size_counts = new TreeMap();
private static final long COMPACTION_CHECK_PERIOD = 2*60*1000; //2 min
private static final long MAX_FREE_BYTES = 10*1024*1024; //10 MB
private static final long MIN_FREE_BYTES = 1*1024*1024; // 1 MB
private long bytesIn = 0;
private long bytesOut = 0;
protected
DirectByteBufferPoolReal()
{
//create the buffer pool for each buffer size
ArrayList list = new ArrayList();
for (int p=START_POWER; p <= END_POWER; p++) {
list.add( new Integer(BigInteger.valueOf(2).pow(p).intValue()));
}
for (int i=0;i<EXTRA_BUCKETS.length;i++){
list.add( new Integer(EXTRA_BUCKETS[i]));
}
Integer[] sizes = new Integer[ list.size() ];
list.toArray( sizes );
Arrays.sort( sizes);
for (int i=0;i<sizes.length;i++){
ArrayList bufferPool = new ArrayList();
buffersMap.put(sizes[i], bufferPool);
}
//initiate periodic timer to check free memory usage
SimpleTimer.addPeriodicEvent(
"DirectBB:compact",
COMPACTION_CHECK_PERIOD,
new TimerEventPerformer() {
public void perform( TimerEvent ev ) {
compactBuffers();
}
}
);
if( DEBUG_PRINT_MEM ) {
Timer printer = new Timer("printer");
printer.addPeriodicEvent(
DEBUG_PRINT_TIME,
new TimerEventPerformer() {
public void perform( TimerEvent ev ) {
printInUse( false );
}
}
);
}
}
/**
* Allocate and return a new direct ByteBuffer.
*/
private ByteBuffer allocateNewBuffer(final int _size) {
try {
return ByteBuffer.allocateDirect(_size);
}
catch (OutOfMemoryError e) {
//Debug.out("Running garbage collector...");
clearBufferPools();
runGarbageCollection();
try {
return ByteBuffer.allocateDirect(_size);
}catch (OutOfMemoryError ex) {
String msg = "Memory allocation failed: Out of direct memory space.\n"
+ "To fix: Use the -XX:MaxDirectMemorySize=512m command line option,\n"
+ "or upgrade your Java JRE to version 1.4.2_05 or 1.5 series or newer.";
Debug.out( msg );
Logger.log(new LogAlert(LogAlert.UNREPEATABLE, LogAlert.AT_ERROR, msg));
printInUse( true );
throw( ex );
}
}
}
/**
* Retrieve a buffer from the buffer pool of size at least
* <b>length</b>, and no larger than <b>DirectByteBufferPool.MAX_SIZE</b>
*/
protected DirectByteBuffer
getBufferSupport(
byte _allocator,
int _length)
{
if (_length < 1) {
Debug.out("requested length [" +_length+ "] < 1");
return null;
}
if (_length > MAX_SIZE) {
Debug.out("requested length [" +_length+ "] > MAX_SIZE [" +MAX_SIZE+ "]");
return null;
}
return pool.getBufferHelper(_allocator,_length);
}
/**
* Retrieve an appropriate buffer from the free pool, or
* create a new one if the pool is empty.
*/
private DirectByteBuffer
getBufferHelper(
byte _allocator,
int _length)
{
DirectByteBuffer res;
if ( _length <= SLICE_END_SIZE ){
res = getSliceBuffer( _allocator, _length );
}else{
ByteBuffer buff = null;
Integer reqVal = new Integer(_length);
//loop through the buffer pools to find a buffer big enough
Iterator it = buffersMap.keySet().iterator();
while (it.hasNext()) {
Integer keyVal = (Integer)it.next();
// check if the buffers in this pool are big enough
if ( reqVal.compareTo(keyVal) <= 0 ){
ArrayList bufferPool = (ArrayList)buffersMap.get(keyVal);
while( true ){
synchronized ( poolsLock ) {
// make sure we don't remove a buffer when running compaction
// if there are no free buffers in the pool, create a new one.
// otherwise use one from the pool
if ( bufferPool.isEmpty()){
buff = allocateNewBuffer(keyVal.intValue());
if ( buff == null ){
Debug.out( "allocateNewBuffer for " + _length + " returned null" );
}
break;
}else{
synchronized ( bufferPool ) {
buff = (ByteBuffer)bufferPool.remove(bufferPool.size() - 1);
}
if ( buff == null ){
Debug.out( "buffer pool for " + _length + " contained null entry" );
}else{
break;
}
}
}
}
break;
}
}
if ( buff == null ){
String str = "Unable to find an appropriate buffer pool for " + _length;
Debug.out( str );
throw( new RuntimeException( str ));
}
res = new DirectByteBuffer( _allocator, buff, this );
}
// clear doesn't actually zero the data, it just sets pos to 0 etc.
ByteBuffer buff = res.getBufferInternal();
buff.clear(); //scrub the buffer
buff.limit( _length );
bytesOut += buff.capacity();
if ( DEBUG_PRINT_MEM || DEBUG_TRACK_HANDEDOUT ){
synchronized( handed_out ){
if ( DEBUG_HANDOUT_SIZES ){
int trim_size;
if ( _length < 32 ){
trim_size = 4;
}else{
trim_size = 16;
}
int trim = ((_length+trim_size-1)/trim_size)*trim_size;
Long count = (Long)size_counts.get(new Integer(trim));
if ( count == null ){
size_counts.put( new Integer( trim ), new Long(1));
}else{
size_counts.put( new Integer( trim), new Long( count.longValue() + 1 ));
}
}
if ( handed_out.put( buff, res ) != null ){
Debug.out( "buffer handed out twice!!!!");
throw( new RuntimeException( "Buffer handed out twice" ));
}
//System.out.println( "[" + handed_out.size() + "] -> " + buff + ", bytesIn = " + bytesIn + ", bytesOut = " + bytesOut );
}
}
// addInUse( dbb.capacity() );
return( res );
}
/**
* Return the given buffer to the appropriate pool.
*/
protected void
returnBufferSupport(
DirectByteBuffer ddb )
{
ByteBuffer buff = ddb.getBufferInternal();
if ( buff == null ){
Debug.out( "Returned dbb has null delegate" );
throw( new RuntimeException( "Returned dbb has null delegate" ));
}
int capacity = buff.capacity();
bytesIn += capacity;
if ( DEBUG_TRACK_HANDEDOUT ){
synchronized( handed_out ){
if ( handed_out.remove( buff ) == null ){
Debug.out( "buffer not handed out" );
throw( new RuntimeException( "Buffer not handed out" ));
}
// System.out.println( "[" + handed_out.size() + "] <- " + buffer + ", bytesIn = " + bytesIn + ", bytesOut = " + bytesOut );
}
}
// remInUse( buffer.capacity() );
if ( capacity <= SLICE_END_SIZE ){
freeSliceBuffer( ddb );
}else{
Integer buffSize = new Integer(capacity);
ArrayList bufferPool = (ArrayList)buffersMap.get(buffSize);
if (bufferPool != null) {
//no need to sync around 'poolsLock', as adding during compaction is ok
synchronized ( bufferPool ){
bufferPool.add(buff);
}
}else{
Debug.out("Invalid buffer given; could not find proper buffer pool");
}
}
}
/**
* Clears the free buffer pools so that currently
* unused buffers can be garbage collected.
*/
private void clearBufferPools() {
Iterator it = buffersMap.values().iterator();
while (it.hasNext()) {
ArrayList bufferPool = (ArrayList)it.next();
bufferPool.clear();
}
}
/**
* Force system garbage collection.
*/
private void runGarbageCollection() {
if ( !disable_gc ){
if( DEBUG_PRINT_MEM ) {
System.out.println( "runGarbageCollection()" );
}
System.runFinalization();
System.gc();
}
}
/**
* Checks memory usage of free buffers in buffer pools,
* and calls the compaction method if necessary.
*/
private void compactBuffers() {
nonsliecd: synchronized (poolsLock)
{
long freeSize = bytesFree();
if (freeSize < MIN_FREE_BYTES)
break nonsliecd;
// apply cleanup pressure based on filling degree
float remainingFactor;
if (freeSize > MAX_FREE_BYTES) // downsize to 50% of the limit (not the current capacity!) if we're overlimit
remainingFactor = 0.5f * MAX_FREE_BYTES / (float) freeSize;
else // reduce to something between 50% (full: maximum reduction) and 100% (empty: no reduction)
remainingFactor = 1.0f - 0.5f * freeSize / (float) MAX_FREE_BYTES;
if (DEBUG_PRINT_MEM)
System.out.println("Performing cleanup, reducing to " + remainingFactor * 100 + "%");
ArrayList pools = new ArrayList(buffersMap.values());
for (int i = pools.size() - 1; i >= 0; i--)
{
ArrayList pool = (ArrayList) pools.get(i);
int limit = (int) (pool.size() * remainingFactor); // floor(), this way we can reach 0 at some point
for (int j = pool.size() - 1; j >= limit; j--)
pool.remove(j);
}
runGarbageCollection();
if (DEBUG_PRINT_MEM)
{
printInUse(false);
System.out.println("Cleanup done\n");
}
}
compactSlices();
}
private long bytesFree() {
long bytesUsed = 0;
synchronized( poolsLock ) {
//count up total bytes used by free buffers
Iterator it = buffersMap.keySet().iterator();
while (it.hasNext()) {
Integer keyVal = (Integer)it.next();
ArrayList bufferPool = (ArrayList)buffersMap.get(keyVal);
bytesUsed += keyVal.intValue() * bufferPool.size();
}
}
return bytesUsed;
}
/*
private final HashMap in_use_counts = new HashMap();
private void addInUse( int size ) {
Integer key = new Integer( size );
synchronized( in_use_counts ) {
Integer count = (Integer)in_use_counts.get( key );
if( count == null ) count = new Integer( 1 );
else count = new Integer( count.intValue() + 1 );
in_use_counts.put( key, count );
}
}
private void remInUse( int size ) {
Integer key = new Integer( size );
synchronized( in_use_counts ) {
Integer count = (Integer)in_use_counts.get( key );
if( count == null ) System.out.println("count = null");
if( count.intValue() == 0 ) System.out.println("count = 0");
in_use_counts.put( key, new Integer( count.intValue() - 1 ) );
}
}
private void printInUse() {
synchronized( in_use_counts ) {
for( Iterator i = in_use_counts.keySet().iterator(); i.hasNext(); ) {
Integer key = (Integer)i.next();
int count = ((Integer)in_use_counts.get( key )).intValue();
int size = key.intValue();
if( count > 0 ) {
if( size < 1024 ) System.out.print("[" +size+ " x " +count+ "] ");
else System.out.print("[" +size/1024+ "K x " +count+ "] ");
}
}
System.out.println();
}
}
*/
private void
printInUse(
boolean verbose )
{
if ( DEBUG_PRINT_MEM ){
System.out.print("DIRECT: given=" +bytesOut/1024/1024+ "MB, returned=" +bytesIn/1024/1024+ "MB, ");
long in_use = bytesOut - bytesIn;
if( in_use < 1024*1024 ) System.out.print( "in use=" +in_use+ "B, " );
else System.out.print( "in use=" +in_use/1024/1024+ "MB, " );
long free = bytesFree();
if( free < 1024*1024 ) System.out.print( "free=" +free+ "B" );
else System.out.print( "free=" +free/1024/1024+ "MB" );
System.out.println();
CacheFileManager cm = null;
try{
cm = CacheFileManagerFactory.getSingleton();
}catch( Throwable e ){
Debug.printStackTrace( e );
}
synchronized( handed_out ){
Iterator it = handed_out.values().iterator();
Map cap_map = new TreeMap();
Map alloc_map = new TreeMap();
while( it.hasNext()){
DirectByteBuffer db = (DirectByteBuffer)it.next();
if ( verbose ){
String trace = db.getTraceString();
if ( trace != null ){
System.out.println( trace );
}
}
Integer cap = new Integer( db.getBufferInternal().capacity());
Byte alloc = new Byte( db.getAllocator());
myInteger c = (myInteger)cap_map.get(cap);
if ( c == null ){
c = new myInteger();
cap_map.put( cap, c );
}
c.value++;
myInteger a = (myInteger)alloc_map.get(alloc);
if ( a == null ){
a = new myInteger();
alloc_map.put( alloc, a );
}
a.value++;
}
it = cap_map.keySet().iterator();
while( it.hasNext()){
Integer key = (Integer)it.next();
myInteger count = (myInteger)cap_map.get( key );
if( key.intValue() < 1024 ){
System.out.print("[" +key.intValue()+ " x " +count.value+ "] ");
}else{
System.out.print("[" +key.intValue()/1024+ "K x " +count.value+ "] ");
}
}
System.out.println();
it = alloc_map.keySet().iterator();
while( it.hasNext()){
Byte key = (Byte)it.next();
myInteger count = (myInteger)alloc_map.get( key );
System.out.print("[" + DirectByteBuffer.AL_DESCS[key.intValue()]+ " x " +count.value+ "] ");
}
if ( cm != null ){
CacheFileManagerStats stats = cm.getStats();
System.out.print( " - Cache: " );
System.out.print( "sz=" + stats.getSize());
System.out.print( ",us=" + stats.getUsedSize());
System.out.print( ",cw=" + stats.getBytesWrittenToCache());
System.out.print( ",cr=" + stats.getBytesReadFromCache());
System.out.print( ",fw=" + stats.getBytesWrittenToFile());
System.out.print( ",fr=" + stats.getBytesReadFromFile());
}
System.out.println();
if ( DEBUG_HANDOUT_SIZES ){
it = size_counts.entrySet().iterator();
String str = "";
while( it.hasNext()){
Map.Entry entry = (Map.Entry)it.next();
str += (str.length()==0?"":",") + entry.getKey() + "=" + entry.getValue();
}
System.out.println( str );
}
String str = "";
for (int i=0;i<slice_entries.length;i++){
boolean[] allocs = slice_allocs[i];
int alloc_count = 0;
for (int j=0;j<allocs.length;j++){
if( allocs[j]){
alloc_count++;
}
}
str += (i==0?"":",") + "["+SLICE_ENTRY_SIZES[i]+"]f=" +slice_entries[i].size()+",a=" + (alloc_count*SLICE_ENTRY_ALLOC_SIZES[i]) + ",u=" +slice_use_count[i];
}
System.out.println( "slices: " + str );
}
if(DEBUG_FREE_SIZES)
{
System.out.print("free block sizes: ");
synchronized (poolsLock)
{
Iterator it = buffersMap.keySet().iterator();
while (it.hasNext())
{
Integer keyVal = (Integer) it.next();
ArrayList bufferPool = (ArrayList) buffersMap.get(keyVal);
int blocksize = keyVal.intValue();
int blockfootprint = keyVal.intValue() * bufferPool.size();
if(blockfootprint == 0)
continue;
String blocksuffix = "";
if(blocksize > 1024) { blocksize /= 1024; blocksuffix = "k";}
if(blocksize > 1024) { blocksize /= 1024; blocksuffix = "M";}
String footsuffix = "";
if(blockfootprint > 1024) { blockfootprint /= 1024; footsuffix = "k";}
if(blockfootprint > 1024) { blockfootprint /= 1024; footsuffix = "M";}
System.out.print("["+ blocksize + blocksuffix + ":" + blockfootprint + footsuffix + "] ");
}
}
System.out.println();
}
long free_mem = Runtime.getRuntime().freeMemory() /1024/1024;
long max_mem = Runtime.getRuntime().maxMemory() /1024/1024;
long total_mem = Runtime.getRuntime().totalMemory() /1024/1024;
System.out.println("HEAP: max=" +max_mem+ "MB, total=" +total_mem+ "MB, free=" +free_mem+ "MB");
System.out.println();
}
}
// Slice buffer management
private DirectByteBuffer
getSliceBuffer(
byte _allocator,
int _length )
{
int slice_index = getSliceIndex( _length );
List my_slice_entries = slice_entries[slice_index];
synchronized( my_slice_entries ){
boolean[] my_allocs = slice_allocs[slice_index];
sliceBuffer sb = null;
if ( my_slice_entries.size() > 0 ){
sb = (sliceBuffer)my_slice_entries.remove(0);
slice_use_count[slice_index]++;
}else{
// find a free slot
short slot = -1;
for (short i=0;i<my_allocs.length;i++){
if( !my_allocs[i]){
slot = i;
break;
}
}
if ( slot != -1 ){
short slice_entry_size = SLICE_ENTRY_SIZES[slice_index];
short slice_entry_count = SLICE_ENTRY_ALLOC_SIZES[slice_index];
ByteBuffer chunk = ByteBuffer.allocateDirect( slice_entry_size*slice_entry_count );
my_allocs[slot] = true;
for (short i=0;i<slice_entry_count;i++){
chunk.limit((i+1)*slice_entry_size);
chunk.position(i*slice_entry_size);
ByteBuffer slice = chunk.slice();
sliceBuffer new_buffer = new sliceBuffer( slice, slot, i );
if ( i == 0 ){
sb = new_buffer;
slice_use_count[slice_index]++;
}else{
my_slice_entries.add( new_buffer );
}
}
}else{
if ( !slice_alloc_fails[slice_index] ){
slice_alloc_fails[slice_index] = true;
Debug.out( "Run out of slice space for '" + SLICE_ENTRY_SIZES[slice_index] + ", reverting to normal allocation" );
}
ByteBuffer buff = ByteBuffer.allocate( _length );
return( new DirectByteBuffer( _allocator, buff, this ));
}
}
sliceDBB dbb = new sliceDBB( _allocator, sb );
return( dbb );
}
}
private void
freeSliceBuffer(
DirectByteBuffer ddb )
{
if ( ddb instanceof sliceDBB ){
int slice_index = getSliceIndex( ddb.getBufferInternal().capacity());
List my_slice_entries = slice_entries[slice_index];
synchronized( my_slice_entries ){
my_slice_entries.add( 0, ((sliceDBB)ddb).getSliceBuffer());
}
}
}
private void
compactSlices()
{
// we don't maintain the buffers in sorted order as this is too costly. however, we
// always allocate and free from the start of the free list, so unused buffer space
// will be at the end of the list. we periodically sort this list into allocate block
// order so that if an entire block isn't used for one compaction cycle all of
// its elements will end up together, if you see what I mean :P
// when we find an entire block is unused then we just drop them from the list to
// permit them (and the underlying block) to be garbage collected
for (int i=0;i<slice_entries.length;i++){
int entries_per_alloc = SLICE_ENTRY_ALLOC_SIZES[i];
List l = slice_entries[i];
// no point in trying gc if not enough entries
if ( l.size() >= entries_per_alloc ){
synchronized( l ){
Collections.sort( l,
new Comparator()
{
public int
compare(
Object o1,
Object o2 )
{
sliceBuffer sb1 = (sliceBuffer)o1;
sliceBuffer sb2 = (sliceBuffer)o2;
int res = sb1.getAllocID() - sb2.getAllocID();
if ( res == 0 ){
res = sb1.getSliceID() - sb2.getSliceID();
}
return( res );
}
});
boolean[] allocs = slice_allocs[i];
Iterator it = l.iterator();
int current_alloc = -1;
int entry_count = 0;
boolean freed_one = false;
while( it.hasNext()){
sliceBuffer sb = (sliceBuffer)it.next();
int aid = sb.getAllocID();
if ( aid != current_alloc ){
if ( entry_count == entries_per_alloc ){
// System.out.println( "CompactSlices[" + SLICE_ENTRY_SIZES[i]+"] freeing " + aid );
freed_one = true;
allocs[aid] = false;
}
current_alloc = aid;
entry_count = 1;
}else{
entry_count++;
}
}
if ( entry_count == entries_per_alloc ){
// System.out.println( "CompactSlices[" + SLICE_ENTRY_SIZES[i]+"] freeing " + current_alloc );
freed_one = true;
allocs[current_alloc] = false;
}
if ( freed_one ){
it = l.iterator();
while( it.hasNext()){
sliceBuffer sb = (sliceBuffer)it.next();
if ( !allocs[ sb.getAllocID()]){
it.remove();
}
}
}
}
}
}
}
private int
getSliceIndex(
int _length )
{
for (int i=0;i<SLICE_ENTRY_SIZES.length;i++){
if ( _length <= SLICE_ENTRY_SIZES[i] ){
return( i );
}
}
Debug.out( "eh?");
return( 0 );
}
private static class
sliceBuffer
{
private ByteBuffer buffer;
private short alloc_id;
private short slice_id;
protected
sliceBuffer(
ByteBuffer _buffer,
short _alloc_id,
short _slice_id )
{
buffer = _buffer;
alloc_id = _alloc_id;
slice_id = _slice_id;
}
protected ByteBuffer
getBuffer()
{
return( buffer );
}
protected short
getAllocID()
{
return( alloc_id );
}
protected short
getSliceID()
{
return( slice_id );
}
}
private static class
sliceDBB
extends DirectByteBuffer
{
private sliceBuffer slice_buffer;
protected
sliceDBB(
byte _allocator,
sliceBuffer _sb )
{
super( _allocator, _sb.getBuffer(), pool );
slice_buffer = _sb;
}
protected sliceBuffer
getSliceBuffer()
{
return( slice_buffer );
}
}
private static class
myInteger
{
int value;
}
}