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#ifndef QPID_HA_ENUM_H
#define QPID_HA_ENUM_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 "qpid/types/Variant.h"
#include "qpid/types/Uuid.h"
#include <string>
#include <set>
#include <iosfwd>
namespace qpid {
namespace framing {
class FieldTable;
}
namespace ha {
/** Base class for enums with string conversion */
class EnumBase {
public:
EnumBase(const char* name_, const char* names_[], size_t count_, unsigned value)
: name(name_), names(names_), count(count_), value(value) {}
/** Convert to string */
std::string str() const;
/** Parse from string, throw if unsuccessful */
void parse(const std::string&);
/** Parse from string, return false if unsuccessful. */
bool parseNoThrow(const std::string&);
protected:
const char* name;
const char** names;
size_t count;
unsigned value;
};
std::ostream& operator<<(std::ostream&, EnumBase);
std::istream& operator>>(std::istream&, EnumBase&);
/** Wrapper template for enums with string conversion */
template <class T> class Enum : public EnumBase {
public:
Enum(T x=T()) : EnumBase(NAME, NAMES, N, x) {}
T get() const { return T(value); }
void operator=(T x) { value = x; }
private:
static const size_t N; // Number of enum values.
static const char* NAMES[]; // Names of enum values.
static const char* NAME; // Descriptive name for the enum type.
};
/** To print an enum x: o << printable(x) */
template <class T> Enum<T> printable(T x) { return Enum<T>(x); }
enum ReplicateLevel {
NONE, ///< Nothing is replicated
CONFIGURATION, ///< Wiring is replicated but not messages
ALL ///< Everything is replicated
};
/** State of a broker: see HaBroker::setStatus for state diagram */
enum BrokerStatus {
JOINING, ///< New broker, looking for primary
CATCHUP, ///< Backup: Connected to primary, catching up on state.
READY, ///< Backup: Caught up, ready to take over.
RECOVERING, ///< Primary: waiting for backups to connect & sync
ACTIVE, ///< Primary: actively serving clients.
STANDALONE ///< Not part of a cluster.
};
inline bool isPrimary(BrokerStatus s) {
return s == RECOVERING || s == ACTIVE || s == STANDALONE;
}
inline bool isBackup(BrokerStatus s) { return !isPrimary(s); }
// String constants.
extern const std::string QPID_REPLICATE;
extern const std::string QPID_HA_UUID;
/** Define IdSet type, not a typedef so we can overload operator << */
class IdSet : public std::set<types::Uuid> {};
std::ostream& operator<<(std::ostream& o, const IdSet& ids);
}} // qpid::ha
#endif /*!QPID_HA_ENUM_H*/
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