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A reactive Java web server.
/*
* Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
*
* This file is part of Baratine(TM)
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Baratine 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; either version 2 of the License, or
* (at your option) any later version.
*
* Baratine 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Baratine; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.v5.kelp;
import io.baratine.service.Result;
import java.io.IOException;
import java.util.Objects;
import com.caucho.v5.baratine.InService;
import com.caucho.v5.kelp.segment.OutSegment;
import com.caucho.v5.kelp.segment.SegmentKelp;
import com.caucho.v5.kelp.segment.SegmentServiceImpl;
import com.caucho.v5.kelp.segment.SegmentStream;
/**
* btree-based node
*/
abstract public class Page
{
static final int CODE_MASK = 0xc0;
static final int INSERT = 0x40;
static final int INSERT_DEAD = 0xc0;
// dead/removed delta item
static final int REMOVE = 0x80;
// removed item with insert value maintained
private final int _id;
private final int _nextId;
private long _sequence;
// save queued.
private int _dataLengthWritten;
// length updated when the write completes
private int _writeSequence;
private int _writeSequenceFlushed;
private long _lruSequence;
Page(int id,
int nextId,
long sequence)
{
_id = id;
_nextId = nextId;
_sequence = sequence;
}
public final int getId()
{
return _id;
}
public final int getNextId()
{
return _nextId;
}
Type getType()
{
return Type.NULL;
}
public Type getLastWriteType()
{
return getType();
}
final boolean isLeaf()
{
return getType().isLeaf();
}
final boolean isTree()
{
return getType().isTree();
}
final boolean isBlob()
{
return getType().isBlob();
}
/**
* Returns true for in-memory loaded pages.
*/
boolean isActive()
{
return false;
}
boolean isStub()
{
return false;
}
/**
* Marks the stub as valid
*/
public void setValid()
{
}
public boolean isValid()
{
return false;
}
SegmentKelp getSegment()
{
return null;
}
public final long getSequence()
{
return _sequence;
}
public final void setSequence(long sequence)
{
if (sequence == 0) {
Thread.dumpStack();
}
synchronized (this) {
_sequence = Math.max(_sequence, sequence);
}
}
boolean compareAndSetSequence(long sequence, long newSequence)
{
synchronized (this) {
if (_sequence == sequence && sequence < newSequence) {
_sequence = newSequence;
return true;
}
else {
return false;
}
}
}
long getLruSequence()
{
return _lruSequence;
}
/*
void updateLruSequence(PageLru lru)
{
long lruSequence = _lruSequence;
long newSequence = lru.getLruSequence();
long delta = lru.getLruSequenceDelta();
if (delta < newSequence - lruSequence || lruSequence <= delta) {
_lruSequence = newSequence;
lru.updateLruSequence();
}
}
*/
void setDirty()
{
_dataLengthWritten = -1;
}
boolean isDirty()
{
return _dataLengthWritten < 0;
}
boolean isSwappable()
{
return ! isDirty() && _writeSequence == _writeSequenceFlushed;
}
void clearDirty()
{
_dataLengthWritten = 1;
}
/**
* Write length is the offset/length of the previous write.
*/
final void setDataLengthWritten(int length)
{
_dataLengthWritten = length;
}
final int getDataLengthWritten()
{
return _dataLengthWritten;
}
/**
* Returns the sequence of the last write start.
*/
public final int getWriteSequence()
{
return _writeSequence;
}
@InService(PageServiceSync.class)
final int nextWriteSequence()
{
return ++_writeSequence;
}
/**
* returns the flush sequence
*/
final int getWriteSequenceFlushed()
{
return _writeSequenceFlushed;
}
Page getStub()
{
return null;
}
/**
* Returns the dirty stub, pending fsync
*/
Page getNewStub()
{
return null;
}
void setStubFromNew(PageServiceImpl pageActor, Page newStub)
{
}
/*
void clearStub()
{
}
*/
/*
@InService(PageActor.class)
final boolean getAndClearDirty()
{
return _isDirty.getAndSet(false);
}
*/
public int getSize()
{
return 0;
}
void sweepStub(PageServiceImpl pageActor)
{
}
int getSaveTail()
{
return 0;
}
//
// checkpoint writes
//
@InService(PageServiceImpl.class)
void writeSweep(TableKelp table,
PageServiceImpl pageActor,
TableWriterService readWrite)
{
write(table, pageActor, readWrite);
}
@InService(PageServiceImpl.class)
void write(TableKelp table,
PageServiceImpl tableServiceImpl,
TableWriterService readWrite)
{
if (isDirty()) {
write(table, tableServiceImpl, getWriteStream(readWrite), getDataLengthWritten());
}
}
void write(TableKelp table,
PageServiceImpl pageActor,
int saveLength)
{
TableWriterService readWrite = table.getReadWrite();
SegmentStream nodeStream = getWriteStream(readWrite);
write(table, pageActor, nodeStream, saveLength);
}
protected SegmentStream getWriteStream(TableWriterService readWrite)
{
return readWrite.getNodeStream();
}
void write(TableKelp table,
PageServiceImpl pageActor,
SegmentStream sOut,
int saveLength)
{
long oldSequence = getSequence();
int tail = getSaveTail();
clearDirty(); // XXX:
/*
Page oldPage = pageActor.getPage(getId());
if (! pageActor.compareAndSetPage(oldPage, this)) {
System.out.println("HMPH2: " + this + " old:" + oldPage);
}
*/
TableWriterService readWrite = table.getReadWrite();
writeImpl(table, pageActor, readWrite, sOut, oldSequence, saveLength, tail);
}
@InService(PageServiceImpl.class)
void writeImpl(TableKelp db,
PageServiceImpl tableServiceImpl,
TableWriterService readWrite,
SegmentStream sOut,
long oldSequence,
int saveLength,
int tail)
{
Objects.requireNonNull(sOut);
int sequenceWrite = nextWriteSequence();
readWrite.writePage(this, sOut, oldSequence, saveLength, tail, sequenceWrite,
Result.onOk(x->{ afterDataFlush(tableServiceImpl, sequenceWrite); }));
}
/**
* Called by the segment writing service to write the page to the stream.
*
* @param table
* @param sOut
* @param oldSequence
* @param saveLength
* @param tail
* @param saveSequence
* @return
* @throws IOException
*/
@InService(SegmentServiceImpl.class)
public
Page writeCheckpoint(TableKelp table,
OutSegment sOut,
long oldSequence,
int saveLength,
int tail,
int saveSequence)
throws IOException
{
return null;
}
/**
* After the data is written to mmap/file, it can be reloaded on a
* stub reload.
*
* @param tableService the owning service
* @param sequenceFlush the write sequence to update
*/
public void afterDataFlush(PageServiceImpl tableService,
int sequenceFlush)
{
_writeSequenceFlushed = Math.max(_writeSequenceFlushed, sequenceFlush);
}
//
// validation
//
/**
* On a segment free, validate that the page has no references.
* @param segment
*/
boolean validateFree(SegmentKelp segment)
{
return true;
}
//
// utilities
//
byte []incrementKey(byte []splitKey)
{
byte []nextKey = new byte[splitKey.length];
System.arraycopy(splitKey, 0, nextKey, 0, splitKey.length);
Row.incrementKey(nextKey);;
return nextKey;
}
@Override
public String toString()
{
return getClass().getSimpleName() + "[" + getId() + ",seq=" + getSequence() + "]";
}
/*
class ResultWritePage implements Result {
private PageServiceImpl _tableService;
private Page _page;
private long _sequenceWrite;
ResultWritePage(PageServiceImpl tableService,
Page page,
long sequenceWrite)
{
_tableService = tableService;
_page = page;
_sequenceWrite = sequenceWrite;
}
@Override
public void handle(Integer value, Throwable exn)
{
_tableService.afterDataFlush(_page, (int) _sequenceWrite);
}
}
*/
public static enum Type {
NULL {
@Override
boolean isValid() { return false; }
},
TREE {
@Override
boolean isTree() { return true; }
},
LEAF {
@Override
boolean isLeaf() { return true; }
},
LEAF_DELTA {
},
BLOB_TEMP {
@Override
boolean isBlob() { return true; }
},
BLOB {
@Override
boolean isBlob() { return true; }
},
BLOB_FREE {
@Override
boolean isBlob() { return true; }
@Override
boolean isValid() { return false; }
};
boolean isLeaf() { return false; }
boolean isTree() { return false; }
boolean isBlob() { return false; }
boolean isValid() { return true; }
static Type valueOf(int index)
{
return Type.values()[index];
}
}
}
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