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// **********************************************************************
//
// Copyright (c) 2003-2004 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#include <Freeze/EvictorIteratorI.h>
#include <Freeze/ObjectStore.h>
#include <Freeze/EvictorI.h>
#include <Freeze/Util.h>
using namespace std;
using namespace Freeze;
using namespace Ice;
Freeze::EvictorIteratorI::EvictorIteratorI(ObjectStore* store, Int batchSize) :
_store(store),
_batchSize(static_cast<size_t>(batchSize)),
_key(1024),
_more(store != 0),
_initialized(false)
{
_batchIterator = _batch.end();
}
bool
Freeze::EvictorIteratorI::hasNext()
{
if(_batchIterator != _batch.end())
{
return true;
}
else
{
_batchIterator = nextBatch();
return (_batchIterator != _batch.end());
}
}
Identity
Freeze::EvictorIteratorI::next()
{
if(hasNext())
{
return *_batchIterator++;
}
else
{
throw Freeze::NoSuchElementException(__FILE__, __LINE__);
}
}
vector<Identity>::const_iterator
Freeze::EvictorIteratorI::nextBatch()
{
DeactivateController::Guard
deactivateGuard(_store->evictor()->deactivateController());
_batch.clear();
if(!_more)
{
return _batch.end();
}
vector<EvictorElementPtr> evictorElements;
evictorElements.reserve(_batchSize);
Key firstKey;
firstKey = _key;
CommunicatorPtr communicator = _store->communicator();
try
{
for(;;)
{
_batch.clear();
evictorElements.clear();
Dbt dbKey;
initializeOutDbt(_key, dbKey);
Dbt dbValue;
dbValue.set_flags(DB_DBT_USERMEM | DB_DBT_PARTIAL);
Dbc* dbc = 0;
try
{
//
// Move to the first record
//
u_int32_t flags = DB_NEXT;
if(_initialized)
{
//
// _key represents the next element not yet returned
// if it has been deleted, we want the one after
//
flags = DB_SET_RANGE;
//
// Will be used as input as well
//
dbKey.set_size(static_cast<u_int32_t>(firstKey.size()));
}
_store->db()->cursor(0, &dbc, 0);
bool done = false;
do
{
for(;;)
{
try
{
//
// It is critical to set key size to key capacity before the
// get, as a resize that increases the size inserts 0
//
_key.resize(_key.capacity());
_more = (dbc->get(&dbKey, &dbValue, flags) == 0);
if(_more)
{
_key.resize(dbKey.get_size());
_initialized = true;
flags = DB_NEXT;
Ice::Identity ident;
ObjectStore::unmarshal(ident, _key, communicator);
if(_batch.size() < _batchSize)
{
_batch.push_back(ident);
}
else
{
//
// Keep the last element in _key
//
done = true;
}
}
break;
}
catch(const DbMemoryException& dx)
{
handleMemoryException(dx, _key, dbKey);
}
}
}
while(!done && _more);
Dbc* toClose = dbc;
dbc = 0;
toClose->close();
break; // for (;;)
}
catch(const DbDeadlockException&)
{
if(dbc != 0)
{
try
{
dbc->close();
}
catch(const DbDeadlockException&)
{
//
// Ignored
//
}
}
_key = firstKey;
//
// Retry
//
}
catch(...)
{
if(dbc != 0)
{
try
{
dbc->close();
}
catch(const DbDeadlockException&)
{
//
// Ignored
//
}
}
throw;
}
}
}
catch(const DbException& dx)
{
DatabaseException ex(__FILE__, __LINE__);
ex.message = dx.what();
throw ex;
}
if(_batch.size() == 0)
{
return _batch.end();
}
else
{
return _batch.begin();
}
}
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