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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.
*
*/
#ifndef _QueueFlowLimit_
#define _QueueFlowLimit_
#include <list>
#include <set>
#include <iostream>
#include <memory>
#include "qpid/broker/BrokerImportExport.h"
#include "qpid/broker/QueuedMessage.h"
#include "qpid/broker/StatefulQueueObserver.h"
#include "qpid/framing/FieldTable.h"
#include "qpid/sys/AtomicValue.h"
#include "qpid/sys/Mutex.h"
namespace qmf {
namespace org {
namespace apache {
namespace qpid {
namespace broker {
class Queue;
}}}}}
namespace _qmfBroker = qmf::org::apache::qpid::broker;
namespace qpid {
namespace broker {
class Broker;
/**
* Producer flow control: when level is > flowStop*, flow control is ON.
* then level is < flowResume*, flow control is OFF. If == 0, flow control
* is not used. If both byte and msg count thresholds are set, then
* passing _either_ level may turn flow control ON, but _both_ must be
* below level before flow control will be turned OFF.
*/
// Note must be EXTERN because it is used by tests.
class QPID_BROKER_CLASS_EXTERN QueueFlowLimit : public StatefulQueueObserver
{
static uint64_t defaultMaxSize;
static uint defaultFlowStopRatio;
static uint defaultFlowResumeRatio;
Queue *queue;
std::string queueName;
uint32_t flowStopCount;
uint32_t flowResumeCount;
uint64_t flowStopSize;
uint64_t flowResumeSize;
bool flowStopped; // true = producers held in flow control
// current queue utilization
uint32_t count;
uint64_t size;
public:
static QPID_BROKER_EXTERN const std::string flowStopCountKey;
static QPID_BROKER_EXTERN const std::string flowResumeCountKey;
static QPID_BROKER_EXTERN const std::string flowStopSizeKey;
static QPID_BROKER_EXTERN const std::string flowResumeSizeKey;
QPID_BROKER_EXTERN virtual ~QueueFlowLimit();
/** the queue has added QueuedMessage. Returns true if flow state changes */
QPID_BROKER_EXTERN void enqueued(const QueuedMessage&);
/** the queue has removed QueuedMessage. Returns true if flow state changes */
QPID_BROKER_EXTERN void dequeued(const QueuedMessage&);
/** for clustering: */
QPID_BROKER_EXTERN void getState(qpid::framing::FieldTable&) const;
QPID_BROKER_EXTERN void setState(const qpid::framing::FieldTable&);
uint32_t getFlowStopCount() const { return flowStopCount; }
uint32_t getFlowResumeCount() const { return flowResumeCount; }
uint64_t getFlowStopSize() const { return flowStopSize; }
uint64_t getFlowResumeSize() const { return flowResumeSize; }
uint32_t getFlowCount() const { return count; }
uint64_t getFlowSize() const { return size; }
bool isFlowControlActive() const { return flowStopped; }
bool monitorFlowControl() const { return flowStopCount || flowStopSize; }
void encode(framing::Buffer& buffer) const;
void decode(framing::Buffer& buffer);
uint32_t encodedSize() const;
static QPID_BROKER_EXTERN void observe(Queue& queue, const qpid::framing::FieldTable& settings);
static QPID_BROKER_EXTERN void setDefaults(uint64_t defaultMaxSize, uint defaultFlowStopRatio, uint defaultFlowResumeRatio);
friend QPID_BROKER_EXTERN std::ostream& operator<<(std::ostream&, const QueueFlowLimit&);
protected:
// msgs waiting for flow to become available.
std::map<framing::SequenceNumber, boost::intrusive_ptr<Message> > index;
mutable qpid::sys::Mutex indexLock;
_qmfBroker::Queue *queueMgmtObj;
const Broker *broker;
QPID_BROKER_EXTERN QueueFlowLimit(Queue *queue,
uint32_t flowStopCount, uint32_t flowResumeCount,
uint64_t flowStopSize, uint64_t flowResumeSize);
static QPID_BROKER_EXTERN QueueFlowLimit *createLimit(Queue *queue, const qpid::framing::FieldTable& settings);
};
}}
#endif
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