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sync_registry.hh
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sync_registry.hh
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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2011 Couchbase, Inc.
*
* 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.
*/
#ifndef SYNC_REGISTRY_HH
#define SYNC_REGISTRY_HH 1
#include <set>
#include <list>
#include <map>
#include <iostream>
#include "common.hh"
#include "dispatcher.hh"
#include "item.hh"
#include "mutex.hh"
#include "queueditem.hh"
typedef struct key_spec_t {
key_spec_t(const queued_item &qi)
: cas(0), vbucketid(qi->getVBucketId()), key(qi->getKey()) {
}
key_spec_t(const Item &it)
: cas(it.getCas()), vbucketid(it.getVBucketId()), key(it.getKey()) {
}
key_spec_t(uint64_t aCas, uint16_t vbid, std::string aKey)
: cas(aCas), vbucketid(vbid), key(aKey) {
}
uint64_t cas;
uint16_t vbucketid;
std::string key;
bool operator<(const key_spec_t &other) const {
return (key < other.key) || ((key == other.key) && (vbucketid < other.vbucketid));
}
} key_spec_t;
std::ostream& operator << (std::ostream& os, const key_spec_t &keyspec);
typedef enum {
PERSIST,
MUTATION,
REP,
REP_OR_PERSIST,
REP_AND_PERSIST
} sync_type_t;
class EventuallyPersistentEngine;
class SyncListener;
/**
* Dispatcher task to kill a SYNC command connection if it's waiting for
* too long.
*/
class SyncAbortCallback : public DispatcherCallback {
public:
SyncAbortCallback(SyncListener &list) : listener(list) {
}
bool callback(Dispatcher &, TaskId);
std::string description() {
return "SyncListener abort callback";
}
hrtime_t maxExpectedDuration();
private:
SyncListener &listener;
};
/**
* Dispatcher task to safely shut down synchronization tasks.
*/
class SyncDestructionCallback : public DispatcherCallback {
public:
SyncDestructionCallback(SyncListener *sl) : syncListener(sl) {
}
bool callback(Dispatcher &, TaskId);
std::string description() {
return "SyncListener destruction callback";
}
private:
SyncListener *syncListener;
};
/**
* Registers listeners for the Sync commands (persistence sync and replication sync).
*/
class SyncRegistry {
public:
SyncRegistry() {
}
void addPersistenceListener(SyncListener *syncListener);
void removePersistenceListener(SyncListener *syncListener);
void itemPersisted(const queued_item &item);
void itemsPersisted(std::list<queued_item> &itemlist);
void addMutationListener(SyncListener *syncListener);
void removeMutationListener(SyncListener *syncListener);
void itemModified(const key_spec_t &keyspec);
void itemDeleted(const key_spec_t &keyspec);
void addReplicationListener(SyncListener *syncListener);
void removeReplicationListener(SyncListener *syncListener);
void itemReplicated(const key_spec_t &keyspec, uint8_t replicaCount = 1);
private:
void notifyListeners(std::set<SyncListener*> &listeners,
const key_spec_t &keyspec,
bool deleted);
void notifyListeners(std::set<SyncListener*> &listeners,
const key_spec_t &keyspec,
uint8_t replicaCount);
std::set<SyncListener*> persistenceListeners;
Mutex persistenceMutex;
std::set<SyncListener*> mutationListeners;
Mutex mutationMutex;
std::set<SyncListener*> replicationListeners;
Mutex replicationMutex;
DISALLOW_COPY_AND_ASSIGN(SyncRegistry);
};
class SyncListener {
public:
SyncListener(EventuallyPersistentEngine &epEngine,
const void *c,
std::set<key_spec_t> *keys,
sync_type_t sync_type,
uint8_t replicaCount = 0);
void keySynced(const key_spec_t &keyspec, bool deleted = false);
void keySynced(const key_spec_t &keyspec, uint8_t numReplicas);
void maybeNotifyIOComplete(bool timedout = false);
bool maybeEnableNotifyIOComplete();
sync_type_t getSyncType() const {
return syncType;
}
bool isFinished() const {
return finished;
}
std::set<key_spec_t>& getPersistedKeys() {
return persistedKeys;
}
std::set<key_spec_t>& getModifiedKeys() {
return modifiedKeys;
}
std::set<key_spec_t>& getDeletedKeys() {
return deletedKeys;
}
std::set<key_spec_t>& getReplicatedKeys() {
return replicatedKeys;
}
std::set<key_spec_t>& getNonExistentKeys() {
return nonExistentKeys;
}
std::set<key_spec_t>& getInvalidCasKeys() {
return invalidCasKeys;
}
/**
* Request destruction of this SyncListener.
*
* This is more complicated than a normal destructor because we
* need to ensure it runs on the right thread.
*/
void destroy();
private:
friend class SyncAbortCallback;
friend class SyncDestructionCallback;
~SyncListener();
EventuallyPersistentEngine &engine;
const void *cookie;
std::set<key_spec_t> *keySpecs;
size_t persistedOrReplicated;
TaskId abortTaskId;
Mutex mutex;
const hrtime_t startTime;
std::set<key_spec_t> persistedKeys;
std::set<key_spec_t> modifiedKeys;
std::set<key_spec_t> deletedKeys;
std::set<key_spec_t> replicatedKeys;
std::map<key_spec_t,uint8_t> replicaCounts;
std::set<key_spec_t> nonExistentKeys;
std::set<key_spec_t> invalidCasKeys;
sync_type_t syncType;
const uint8_t replicasPerKey;
bool finished;
bool allowNotify;
};
#endif /* SYNC_REGISTRY_HH */