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#ifndef QPID_HA_EVENT_H
#define QPID_HA_EVENT_H
/*
*
* 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 "types.h"
#include "qpid/broker/Message.h"
#include "qpid/framing/BufferTypes.h"
/**@file Defines event messages used to pass transaction information from
* primary observers to backup replicators.
*/
namespace qpid {
namespace ha {
broker::Message makeMessage(
const std::string& content,
const std::string& destination,
const std::string& routingKey);
/** Test if a string is an event key */
bool isEventKey(const std::string& key);
/** Base class for encodable events */
class Event {
public:
virtual ~Event() {}
virtual void encode(framing::Buffer& buffer) const = 0;
virtual void decode(framing::Buffer& buffer) = 0;
virtual size_t encodedSize() const = 0;
virtual std::string key() const = 0; // Routing key
virtual void print(std::ostream& o) const = 0;
broker::Message message(const std::string& destination=std::string()) const {
return makeMessage(framing::encodeStr(*this), destination, key()); }
};
inline std::ostream& operator<<(std::ostream& o, const Event& e) {
o << "<" << e.key() << ":";
e.print(o);
return o << ">";
}
/** Event base template */
template <class Derived> class EventBase : public Event {
public:
std::string key() const { return Derived::KEY; }
};
//////////////// Specific event type
//// QueueReplicator events
struct DequeueEvent : public EventBase<DequeueEvent> {
static const std::string KEY;
ReplicationIdSet ids;
DequeueEvent(ReplicationIdSet ids_=ReplicationIdSet()) : ids(ids_) {}
void encode(framing::Buffer& b) const { b.put(ids); }
void decode(framing::Buffer& b) { b.get(ids); }
virtual size_t encodedSize() const { return ids.encodedSize(); }
void print(std::ostream& o) const { o << ids; }
};
struct IdEvent : public EventBase<IdEvent> {
static const std::string KEY;
ReplicationId id;
IdEvent(ReplicationId id_=0) : id(id_) {}
void encode(framing::Buffer& b) const { b.put(id); }
void decode(framing::Buffer& b) { b.get(id); }
virtual size_t encodedSize() const { return id.encodedSize(); }
void print(std::ostream& o) const { o << id; }
};
//// Transaction events
struct TxEnqueueEvent : public EventBase<TxEnqueueEvent> {
static const std::string KEY;
framing::LongString queue;
ReplicationId id;
TxEnqueueEvent(std::string q=std::string(), ReplicationId i=ReplicationId())
: queue(q), id(i) {}
void encode(framing::Buffer& b) const { b.put(queue); b.put(id); }
void decode(framing::Buffer& b) { b.get(queue); b.get(id); }
virtual size_t encodedSize() const { return queue.encodedSize()+id.encodedSize(); }
void print(std::ostream& o) const { o << queue.value << " " << id; }
};
struct TxDequeueEvent : public EventBase<TxDequeueEvent> {
static const std::string KEY;
framing::LongString queue;
ReplicationId id;
TxDequeueEvent(std::string q=std::string(), ReplicationId r=0) :
queue(q), id(r) {}
void encode(framing::Buffer& b) const { b.put(queue);b.put(id); }
void decode(framing::Buffer& b) { b.get(queue);b.get(id); }
virtual size_t encodedSize() const { return queue.encodedSize()+id.encodedSize(); }
void print(std::ostream& o) const { o << queue.value << " " << id; }
};
struct TxPrepareEvent : public EventBase<TxPrepareEvent> {
static const std::string KEY;
void encode(framing::Buffer&) const {}
void decode(framing::Buffer&) {}
virtual size_t encodedSize() const { return 0; }
void print(std::ostream&) const {}
};
struct TxCommitEvent : public EventBase<TxCommitEvent> {
static const std::string KEY;
void encode(framing::Buffer&) const {}
void decode(framing::Buffer&) {}
virtual size_t encodedSize() const { return 0; }
void print(std::ostream&) const {}
};
struct TxRollbackEvent : public EventBase<TxRollbackEvent> {
static const std::string KEY;
void encode(framing::Buffer&) const {}
void decode(framing::Buffer&) {}
virtual size_t encodedSize() const { return 0; }
void print(std::ostream&) const {}
};
struct TxPrepareOkEvent : public EventBase<TxPrepareOkEvent> {
static const std::string KEY;
types::Uuid broker;
TxPrepareOkEvent(const types::Uuid& b=types::Uuid()) : broker(b) {}
void encode(framing::Buffer& b) const {
b.putRawData(broker.data(), broker.size());
}
void decode(framing::Buffer& b) {
std::string s;
b.getRawData(s, broker.size());
broker = types::Uuid(&s[0]);
}
virtual size_t encodedSize() const { return broker.size(); }
void print(std::ostream& o) const { o << broker; }
};
struct TxPrepareFailEvent : public EventBase<TxPrepareFailEvent> {
static const std::string KEY;
types::Uuid broker;
TxPrepareFailEvent(const types::Uuid& b=types::Uuid()) : broker(b) {}
void encode(framing::Buffer& b) const { b.putRawData(broker.data(), broker.size()); }
void decode(framing::Buffer& b) {
std::string s;
b.getRawData(s, broker.size());
broker = types::Uuid(&s[0]);
}
virtual size_t encodedSize() const { return broker.size(); }
void print(std::ostream& o) const { o << broker; }
};
struct TxMembersEvent : public EventBase<TxMembersEvent> {
static const std::string KEY;
UuidSet members;
TxMembersEvent(const UuidSet& s=UuidSet()) : members(s) {}
void encode(framing::Buffer& b) const { b.put(members); }
void decode(framing::Buffer& b) { b.get(members); }
size_t encodedSize() const { return members.encodedSize(); }
void print(std::ostream& o) const { o << members; }
};
}} // namespace qpid::ha
#endif /*!QPID_HA_EVENT_H*/
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