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LocalChangesPackage.cpp
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LocalChangesPackage.cpp
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/*
* This file is part of buteo-syncml package
*
* Copyright (C) 2010 Nokia Corporation. All rights reserved.
*
* Contact: Sateesh Kavuri <sateesh.kavuri@nokia.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* Neither the name of Nokia Corporation nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "LocalChangesPackage.h"
#include <QTimer>
#include "SyncTarget.h"
#include "StoragePlugin.h"
#include "SyncItem.h"
#include "SyncMLSync.h"
#include "SyncMLMessage.h"
#include "SyncMLAdd.h"
#include "SyncMLReplace.h"
#include "SyncMLDelete.h"
#include "SyncMLItem.h"
#include "SyncAgentConsts.h"
#include "SyncMLLogging.h"
using namespace DataSync;
LocalChangesPackage::LocalChangesPackage( const SyncTarget& aSyncTarget,
const LocalChanges& aLocalChanges,
int aLargeObjectThreshold,
const Role& aRole,
int aMaxChangesPerMessage) :
iLargeObjectThreshold( aLargeObjectThreshold ),
iSyncTarget( aSyncTarget ),
iLocalChanges( aLocalChanges ),
iRole( aRole ),
iMaxChangesPerMessage(aMaxChangesPerMessage),
iPrefetcher( aLocalChanges.added + aLocalChanges.modified,
*aSyncTarget.getPlugin(),
aMaxChangesPerMessage )
{
FUNCTION_CALL_TRACE(lcSyncMLTrace);
iNumberOfChanges = iLocalChanges.added.count() +
iLocalChanges.modified.count() +
iLocalChanges.removed.count();
}
LocalChangesPackage::~LocalChangesPackage()
{
FUNCTION_CALL_TRACE(lcSyncMLTrace);
delete iLargeObjectState.iItem;
iLargeObjectState.iItem = 0;
}
bool LocalChangesPackage::write( SyncMLMessage& aMessage, int& aSizeThreshold, bool aWBXML, const ProtocolVersion& aVersion )
{
FUNCTION_CALL_TRACE(lcSyncMLTrace);
bool allWritten = false;
int remainingBytes = aSizeThreshold;
SyncMLSync* sync = new SyncMLSync( aMessage.getNextCmdId(),
iSyncTarget.getTargetDatabase(),
iSyncTarget.getSourceDatabase() );
sync->addNumberOfChanges( iNumberOfChanges );
remainingBytes -= sync->calculateSize(aWBXML, aVersion);
int itemsThatCanBeSent = iMaxChangesPerMessage;
if( iNumberOfChanges > 0 ) {
if( processAddedItems(aMessage, *sync, remainingBytes,itemsThatCanBeSent, aWBXML, aVersion) &&
processModifiedItems(aMessage, *sync, remainingBytes, itemsThatCanBeSent, aWBXML, aVersion) &&
processRemovedItems(aMessage, *sync, remainingBytes, itemsThatCanBeSent, aWBXML, aVersion) ) {
allWritten = true;
}
}
else {
allWritten = true;
}
aMessage.addToBody( sync );
aSizeThreshold = remainingBytes;
if( !allWritten )
{
// If we didn't finish writing everything, schedule idle-time prefetcher
iPrefetcher.setBatchSizeHint( iMaxChangesPerMessage - itemsThatCanBeSent );
QTimer::singleShot( 0, &iPrefetcher, SLOT(prefetch()) );
}
return allWritten;
}
bool LocalChangesPackage::processAddedItems( SyncMLMessage& aMessage,
SyncMLSync& aSyncElement,
int& aSizeThreshold ,
int& aItemsThatCanBeSent,
bool aWBXML,
const ProtocolVersion& aVersion)
{
FUNCTION_CALL_TRACE(lcSyncMLTrace);
int remainingBytes = aSizeThreshold;
while( iLocalChanges.added.count() > 0 &&
aItemsThatCanBeSent > 0 &&
remainingBytes > 0 )
{
int cmdId = aMessage.getNextCmdId();
SyncMLAdd* add = new SyncMLAdd(cmdId);
SyncItemKey key = iLocalChanges.added.first();
QString mimeType;
bool processed = processItem( key, *add, remainingBytes, SYNCML_ADD, mimeType );
remainingBytes -= add->calculateSize(aWBXML, aVersion);
aSyncElement.addChild( add );
if (processed)
{
emit newItemWritten( aMessage.getMsgId(), cmdId, key, MOD_ITEM_ADDED,
iSyncTarget.getSourceDatabase(), iSyncTarget.getTargetDatabase(),
mimeType );
aItemsThatCanBeSent--;
iLocalChanges.added.removeFirst();
}
else
{
break;
}
}
aSizeThreshold = remainingBytes;
bool processed = false;
if( iLocalChanges.added.count() == 0 )
{
qCDebug(lcSyncML) << "Processed all added items";
processed = true;
}
return processed;
}
bool LocalChangesPackage::processModifiedItems( SyncMLMessage& aMessage,
SyncMLSync& aSyncElement,
int& aSizeThreshold,
int& aItemsThatCanBeSent,
bool aWBXML,
const ProtocolVersion& aVersion)
{
FUNCTION_CALL_TRACE(lcSyncMLTrace);
int remainingBytes = aSizeThreshold;
while( iLocalChanges.modified.count() > 0 &&
aItemsThatCanBeSent > 0 &&
remainingBytes > 0 )
{
int cmdId = aMessage.getNextCmdId();
SyncMLReplace* replace = new SyncMLReplace( cmdId );
SyncItemKey key = iLocalChanges.modified.first();
QString mimeType;
bool processed = processItem( key, *replace, remainingBytes, SYNCML_REPLACE, mimeType );
remainingBytes -= replace->calculateSize(aWBXML, aVersion);
aSyncElement.addChild( replace );
if (processed)
{
emit newItemWritten( aMessage.getMsgId(), cmdId, key, MOD_ITEM_MODIFIED,
iSyncTarget.getSourceDatabase(), iSyncTarget.getTargetDatabase(),
mimeType );
aItemsThatCanBeSent--;
iLocalChanges.modified.removeFirst();
}
else
{
break;
}
}
aSizeThreshold = remainingBytes;
bool processed = false;
if( iLocalChanges.modified.count() == 0 )
{
qCDebug(lcSyncML) << "Processed all modified items";
processed = true;
}
return processed;
}
bool LocalChangesPackage::processRemovedItems( SyncMLMessage& aMessage,
SyncMLSync& aSyncElement,
int& aSizeThreshold,
int& aItemsThatCanBeSent,
bool aWBXML,
const ProtocolVersion& aVersion)
{
FUNCTION_CALL_TRACE(lcSyncMLTrace);
int remainingBytes = aSizeThreshold;
while( iLocalChanges.removed.count() > 0 &&
aItemsThatCanBeSent > 0 &&
remainingBytes > 0 )
{
int cmdId = aMessage.getNextCmdId();
SyncMLDelete* del = new SyncMLDelete(cmdId);
SyncItemKey key = iLocalChanges.removed.first();
// @todo: we cannot know the mime type in the case of deleted items. In overall it's bad
// that we're using mimetype here, we should be able to handle identification of used
// storage purely on the db uri's.
QString mimeType;
bool processed = processItem( key, *del, remainingBytes, SYNCML_DELETE, mimeType );
remainingBytes -= del->calculateSize(aWBXML, aVersion);
aSyncElement.addChild( del );
if (processed) {
emit newItemWritten( aMessage.getMsgId(), cmdId, key, MOD_ITEM_DELETED,
iSyncTarget.getSourceDatabase(), iSyncTarget.getTargetDatabase(), mimeType );
aItemsThatCanBeSent--;
iLocalChanges.removed.removeFirst();
}
else
{
break;
}
}
aSizeThreshold = remainingBytes;
bool processed = false;
if( iLocalChanges.removed.count() == 0 )
{
qCDebug(lcSyncML) << "Processed all deleted items";
processed = true;
}
return processed;
}
bool LocalChangesPackage::processItem( const SyncItemKey& aItemKey,
SyncMLLocalChange& aParent,
int aSizeThreshold,
SyncMLCommand aCommand,
QString& aMimeType )
{
FUNCTION_CALL_TRACE(lcSyncMLTrace);
bool processed = false;
SyncMLItem* itemObject = new SyncMLItem();
if( aCommand == SYNCML_ADD ) {
itemObject->insertSource( aItemKey );
}
else {
if( iRole == ROLE_SERVER ) {
SyncItemKey remoteKey = iSyncTarget.mapToRemoteUID( aItemKey );
if( !remoteKey.isEmpty() ) {
itemObject->insertTarget( remoteKey );
}
else {
qCWarning(lcSyncML) << "Could not find mapping to for local uid: " << aItemKey;
}
}
else {
itemObject->insertSource( aItemKey );
}
}
if( aCommand == SYNCML_DELETE )
{
// Delete command does not include item data
processed = true;
}
else
{
SyncItem* item = 0;
if( iLargeObjectState.iItem )
{
// We're in the middle of sending a large object
item = iLargeObjectState.iItem;
}
else
{
// We're not sending a large object, so get the item from plugin
item = iPrefetcher.getItem( aItemKey );
}
if (item)
{
aMimeType = item->getType();
aParent.addMimeMetadata( item->getType() );
qint64 size = item->getSize();
QString version = item->getVersion();
if ( !version.isEmpty()) {
aParent.addVersionMetadata(version);
}
if( !item->getParentKey()->isEmpty() )
{
const SyncItemKey* parentKey = item->getParentKey();
if( iRole == ROLE_SERVER )
{
SyncItemKey remoteKey = iSyncTarget.mapToRemoteUID( *parentKey );
if( !remoteKey.isEmpty() )
{
itemObject->insertTargetParent( remoteKey );
}
else
{
itemObject->insertSourceParent( *parentKey );
}
}
else if( iRole == ROLE_CLIENT )
{
itemObject->insertSourceParent( *parentKey );
}
// no else
}
if (size > iLargeObjectThreshold) {
if(iLargeObjectState.iItem) {
// Item is large and needs to be sent using multiple messages
qCDebug(lcSyncML) << "Writing item" << aItemKey << "as large object, size:" << size;
QByteArray data;
qint64 dataLeft = iLargeObjectState.iSize - iLargeObjectState.iOffset;
if( dataLeft > aSizeThreshold )
{
qCDebug(lcSyncML) << "Writing chunk of" << aSizeThreshold << "bytes";
// Need to send more chunks after this one
item->read( iLargeObjectState.iOffset, aSizeThreshold, data );
// syncml-ds-tool from libsyncml complains that
// consecutive package of a single message should
// not have size in header
//aParent.addSizeMetadata( size );
itemObject->insertData( data );
itemObject->insertMoreData();
iLargeObjectState.iOffset += aSizeThreshold;
}
else
{
qCDebug(lcSyncML) << "Writing last chunk of" << dataLeft << "bytes";
// This is the last chunk
item->read( iLargeObjectState.iOffset, dataLeft, data );
itemObject->insertData( data );
iLargeObjectState.iItem = 0;
iLargeObjectState.iSize = 0;
iLargeObjectState.iOffset = 0;
delete item;
item = 0;
processed = true;
}
}
else if( size <= aSizeThreshold) {
qCDebug(lcSyncML) << "Writing item" << aItemKey << "as normal object, size:" << size;
QByteArray data;
item->read( 0, size, data );
itemObject->insertData( data );
delete item;
item = 0;
processed = true;
}
else
{
// If no chunks of the item has yet been sent, prepare tracking
// data
qCDebug(lcSyncML) << "Setting up largeObject data";
iLargeObjectState.iItem = item;
iLargeObjectState.iSize = size;
iLargeObjectState.iOffset = 0;
qCDebug(lcSyncML) << "Writing chunk of" << aSizeThreshold << "bytes";
// Need to send more chunks after this one
QByteArray data;
item->read( iLargeObjectState.iOffset, aSizeThreshold, data );
aParent.addSizeMetadata( size );
itemObject->insertData( data );
itemObject->insertMoreData();
iLargeObjectState.iOffset += aSizeThreshold;
}
}
else //(size <= aSizeThreshold )
{
qCDebug(lcSyncML) << "Writing item" << aItemKey << "as normal object, size:" << size;
QByteArray data;
item->read( 0, size, data );
itemObject->insertData( data );
delete item;
item = 0;
processed = true;
}
}
else
{
qCWarning(lcSyncML) << "Could not retrieve item data:" << aItemKey;
processed = true;
}
}
aParent.addChild( itemObject );
return processed;
}