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#ifndef CPG_H
#define CPG_H
/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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/Exception.h"
#include "qpid/cluster/Dispatchable.h"
#include <cassert>
#include <string.h>
extern "C" {
#include <openais/cpg.h>
}
namespace qpid {
namespace cluster {
/**
* Lightweight C++ interface to cpg.h operations.
* Manages a single CPG handle, initialized in ctor, finialzed in destructor.
* On error all functions throw Cpg::Exception
*/
class Cpg : public Dispatchable {
public:
struct Exception : public ::qpid::Exception {
Exception(const std::string& msg) : ::qpid::Exception(msg) {}
};
struct Name : public cpg_name {
Name(const char* s) { copy(s, strlen(s)); }
Name(const char* s, size_t n) { copy(s,n); }
Name(const std::string& s) { copy(s.data(), s.size()); }
void copy(const char* s, size_t n) {
assert(n < CPG_MAX_NAME_LENGTH);
memcpy(value, s, n);
length=n;
}
std::string str() const { return std::string(value, length); }
};
struct Id {
uint64_t id;
Id(uint64_t n=0) : id(n) {}
Id(uint32_t nodeid, uint32_t pid) { id=(uint64_t(nodeid)<<32)+ pid; }
Id(const cpg_address& addr) : id(Id(addr.nodeid, addr.pid)) {}
operator uint64_t() const { return id; }
uint32_t nodeId() const { return id >> 32; }
pid_t pid() const { return id & 0xFFFF; }
};
static std::string str(const cpg_name& n) {
return std::string(n.value, n.length);
}
struct Handler {
virtual ~Handler() {};
virtual void deliver(
cpg_handle_t /*handle*/,
struct cpg_name *group,
uint32_t /*nodeid*/,
uint32_t /*pid*/,
void* /*msg*/,
int /*msg_len*/) = 0;
virtual void configChange(
cpg_handle_t /*handle*/,
struct cpg_name */*group*/,
struct cpg_address */*members*/, int /*nMembers*/,
struct cpg_address */*left*/, int /*nLeft*/,
struct cpg_address */*joined*/, int /*nJoined*/
) = 0;
};
/** Open a CPG handle.
*@param handler for CPG events.
*/
Cpg(Handler&);
/** Destructor calls shutdown. */
~Cpg();
/** Disconnect from CPG */
void shutdown();
/** Dispatch CPG events.
*@param type one of
* - CPG_DISPATCH_ONE - dispatch exactly one event.
* - CPG_DISPATCH_ALL - dispatch all available events, don't wait.
* - CPG_DISPATCH_BLOCKING - blocking dispatch loop.
*/
void dispatch(cpg_dispatch_t type) {
check(cpg_dispatch(handle,type), "Error in CPG dispatch");
}
void dispatchOne() { dispatch(CPG_DISPATCH_ONE); }
void dispatchAll() { dispatch(CPG_DISPATCH_ALL); }
void dispatchBlocking() { dispatch(CPG_DISPATCH_BLOCKING); }
void join(const Name& group) {
check(cpg_join(handle, const_cast<Name*>(&group)),cantJoinMsg(group));
};
void leave(const Name& group) {
check(cpg_leave(handle,const_cast<Name*>(&group)),cantLeaveMsg(group));
}
void mcast(const Name& group, const iovec* iov, int iovLen) {
check(cpg_mcast_joined(
handle, CPG_TYPE_AGREED, const_cast<iovec*>(iov), iovLen),
cantMcastMsg(group));
}
cpg_handle_t getHandle() const { return handle; }
private:
class Handles;
struct ClearHandleOnExit;
friend class Handles;
friend struct ClearHandleOnExit;
static std::string errorStr(cpg_error_t err, const std::string& msg);
static std::string cantJoinMsg(const Name&);
static std::string cantLeaveMsg(const Name&);
static std::string cantMcastMsg(const Name&);
static void check(cpg_error_t result, const std::string& msg) {
// TODO aconway 2007-06-01: Logging and exceptions.
if (result != CPG_OK)
throw Exception(errorStr(result, msg));
}
static void globalDeliver(
cpg_handle_t /*handle*/,
struct cpg_name *group,
uint32_t /*nodeid*/,
uint32_t /*pid*/,
void* /*msg*/,
int /*msg_len*/);
static void globalConfigChange(
cpg_handle_t /*handle*/,
struct cpg_name */*group*/,
struct cpg_address */*members*/, int /*nMembers*/,
struct cpg_address */*left*/, int /*nLeft*/,
struct cpg_address */*joined*/, int /*nJoined*/
);
static Handles handles;
cpg_handle_t handle;
Handler& handler;
};
std::ostream& operator <<(std::ostream& out, const cpg_name& name);
std::ostream& operator <<(std::ostream& out, const Cpg::Id& id);
std::ostream& operator <<(std::ostream& out, const std::pair<cpg_address*,int> addresses);
inline bool operator==(const cpg_name& a, const cpg_name& b) {
return a.length==b.length && strncmp(a.value, b.value, a.length) == 0;
}
inline bool operator!=(const cpg_name& a, const cpg_name& b) { return !(a == b); }
}} // namespace qpid::cluster
#endif /*!CPG_H*/
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