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/*
* Copyright (C) 2008-2009 Patrick Ohly <patrick.ohly@gmx.de>
* Copyright (C) 2009 Intel Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <syncevo/TrackingSyncSource.h>
#include <syncevo/SafeConfigNode.h>
#include <syncevo/PrefixConfigNode.h>
#include <boost/bind.hpp>
#include <syncevo/declarations.h>
SE_BEGIN_CXX
TrackingSyncSource::TrackingSyncSource(const SyncSourceParams ¶ms,
int granularitySeconds) :
TestingSyncSource(params)
{
boost::shared_ptr<ConfigNode> safeNode(new SafeConfigNode(params.m_nodes.getTrackingNode()));
m_trackingNode.reset(new PrefixConfigNode("item-", safeNode));
m_metaNode = safeNode;
m_operations.m_checkStatus = boost::bind(&TrackingSyncSource::checkStatus, this, _1);
m_operations.m_isEmpty = boost::bind(&TrackingSyncSource::isEmpty, this);
SyncSourceRevisions::init(this, this, granularitySeconds, m_operations);
}
void TrackingSyncSource::checkStatus(SyncSourceReport &changes)
{
// use the most reliable (and most expensive) method by default
ChangeMode mode = CHANGES_FULL;
// assume that we do a regular sync, with reusing stored information
// if possible
string oldRevision = m_metaNode->readProperty("databaseRevision");
if (!oldRevision.empty()) {
string newRevision = databaseRevision();
SE_LOG_DEBUG(NULL, getDisplayName(), "old database revision '%s', new revision '%s'",
oldRevision.c_str(),
newRevision.c_str());
if (newRevision == oldRevision) {
SE_LOG_DEBUG(NULL, getDisplayName(), "revisions match, no item changes");
mode = CHANGES_NONE;
}
}
if (mode == CHANGES_FULL) {
SE_LOG_DEBUG(NULL, getDisplayName(), "using full item scan to detect changes");
}
detectChanges(*m_trackingNode, mode);
// copy our item counts into the report
changes.setItemStat(ITEM_LOCAL, ITEM_ADDED, ITEM_TOTAL, getNewItems().size());
changes.setItemStat(ITEM_LOCAL, ITEM_UPDATED, ITEM_TOTAL, getUpdatedItems().size());
changes.setItemStat(ITEM_LOCAL, ITEM_REMOVED, ITEM_TOTAL, getDeletedItems().size());
changes.setItemStat(ITEM_LOCAL, ITEM_ANY, ITEM_TOTAL, getAllItems().size());
}
void TrackingSyncSource::beginSync(const std::string &lastToken, const std::string &resumeToken)
{
// use the most reliable (and most expensive) method by default
ChangeMode mode = CHANGES_FULL;
// resume token overrides the normal token; safe to ignore in most
// cases and this detectChanges() is done independently of the
// token, but let's do it right here anyway
string token;
if (!resumeToken.empty()) {
token = resumeToken;
} else {
token = lastToken;
}
// slow sync if token is empty
if (token.empty()) {
SE_LOG_DEBUG(NULL, getDisplayName(), "slow sync or testing, do full item scan to detect changes");
mode = CHANGES_SLOW;
} else {
string oldRevision = m_metaNode->readProperty("databaseRevision");
if (!oldRevision.empty()) {
string newRevision = databaseRevision();
SE_LOG_DEBUG(NULL, getDisplayName(), "old database revision '%s', new revision '%s'",
oldRevision.c_str(),
newRevision.c_str());
if (newRevision == oldRevision) {
SE_LOG_DEBUG(NULL, getDisplayName(), "revisions match, no item changes");
mode = CHANGES_NONE;
}
// Reset old revision. If anything goes wrong, then we
// don't want to rely on a possibly incorrect optimization.
m_metaNode->setProperty("databaseRevision", "");
m_metaNode->flush();
}
}
if (mode == CHANGES_FULL) {
SE_LOG_DEBUG(NULL, getDisplayName(), "using full item scan to detect changes");
}
bool forceSlowSync = detectChanges(*m_trackingNode, mode);
if (forceSlowSync) {
// tell engine that we need a slow sync
SE_THROW_EXCEPTION_STATUS(StatusException,
"change detection incomplete, must do slow sync",
STATUS_SLOW_SYNC_508);
}
}
std::string TrackingSyncSource::endSync(bool success)
{
// store changes persistently
flush();
if (success) {
string updatedRevision = databaseRevision();
m_metaNode->setProperty("databaseRevision", updatedRevision);
// flush both nodes, just in case; in practice, the properties
// end up in the same file and only get flushed once
m_trackingNode->flush();
m_metaNode->flush();
} else {
// The Synthesis docs say that we should rollback in case of
// failure. Cannot do that for data, so lets at least keep
// the revision map unchanged.
}
// no token handling at the moment (not needed for clients):
// return a non-empty token to distinguish an incremental
// sync from a slow sync in beginSync()
return "1";
}
TrackingSyncSource::InsertItemResult TrackingSyncSource::insertItem(const std::string &luid, const std::string &item)
{
InsertItemResult res = insertItem(luid, item, false);
if (res.m_state != ITEM_NEEDS_MERGE) {
updateRevision(*m_trackingNode, luid, res.m_luid, res.m_revision);
}
return res;
}
TrackingSyncSource::InsertItemResult TrackingSyncSource::insertItemRaw(const std::string &luid, const std::string &item)
{
InsertItemResult res = insertItem(luid, item, true);
if (res.m_state != ITEM_NEEDS_MERGE) {
updateRevision(*m_trackingNode, luid, res.m_luid, res.m_revision);
}
return res;
}
void TrackingSyncSource::readItem(const std::string &luid, std::string &item)
{
readItem(luid, item, false);
}
void TrackingSyncSource::readItemRaw(const std::string &luid, std::string &item)
{
readItem(luid, item, true);
}
void TrackingSyncSource::deleteItem(const std::string &luid)
{
removeItem(luid);
deleteRevision(*m_trackingNode, luid);
}
void TrackingSyncSource::enableServerMode()
{
SyncSourceAdmin::init(m_operations, this);
SyncSourceBlob::init(m_operations, getCacheDir());
}
bool TrackingSyncSource::serverModeEnabled() const
{
return m_operations.m_loadAdminData;
}
std::string TrackingSyncSource::getPeerMimeType() const
{
return getMimeType();
}
SE_END_CXX
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