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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qmf/SchemaCache.h"
#include "qmf/exceptions.h"
using namespace std;
using namespace qmf;
bool SchemaCache::declareSchemaId(const SchemaId& id)
{
qpid::sys::Mutex::ScopedLock l(lock);
SchemaMap::const_iterator iter = schemata.find(id);
if (iter == schemata.end()) {
schemata[id] = Schema();
return false;
}
return true;
}
void SchemaCache::declareSchema(const Schema& schema)
{
qpid::sys::Mutex::ScopedLock l(lock);
SchemaMap::const_iterator iter = schemata.find(schema.getSchemaId());
if (iter == schemata.end() || !iter->second.isValid()) {
schemata[schema.getSchemaId()] = schema;
//
// If there are any threads blocking in SchemaCache::getSchema waiting for
// this schema, unblock them all now.
//
CondMap::iterator cIter = conditions.find(schema.getSchemaId());
if (cIter != conditions.end())
cIter->second->notifyAll();
}
}
bool SchemaCache::haveSchema(const SchemaId& id) const
{
qpid::sys::Mutex::ScopedLock l(lock);
SchemaMap::const_iterator iter = schemata.find(id);
return iter != schemata.end() && iter->second.isValid();
}
const Schema& SchemaCache::getSchema(const SchemaId& id, qpid::messaging::Duration timeout) const
{
qpid::sys::Mutex::ScopedLock l(lock);
SchemaMap::const_iterator iter = schemata.find(id);
if (iter != schemata.end() && iter->second.isValid())
return iter->second;
//
// The desired schema is not in the cache. Assume that the caller knows this and has
// sent a schema request to the remote agent and now wishes to wait until the schema
// information arrives.
//
CondMap::iterator cIter = conditions.find(id);
if (cIter == conditions.end())
conditions[id] = boost::shared_ptr<qpid::sys::Condition>(new qpid::sys::Condition());
uint64_t milliseconds = timeout.getMilliseconds();
conditions[id]->wait(lock, qpid::sys::AbsTime(qpid::sys::now(),
qpid::sys::Duration(milliseconds * qpid::sys::TIME_MSEC)));
iter = schemata.find(id);
if (iter != schemata.end() && iter->second.isValid())
return iter->second;
throw QmfException("Schema lookup timed out");
}
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