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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.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_mcache_hpp
#define tuscany_mcache_hpp
/**
* Memcached access functions.
*/
#include "apr.h"
#include "apu.h"
#include "apr_general.h"
#include "apr_strings.h"
#include "apr_hash.h"
#include "apr_memcache.h"
#include "apr_network_io.h"
#include "string.hpp"
#include "list.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "../../modules/scheme/eval.hpp"
namespace tuscany {
namespace cache {
/**
* Represents a memcached context.
*/
class MemCached {
public:
MemCached() {
apr_pool_create(&pool, NULL);
apr_memcache_create(pool, 1, 0, &mc);
init("localhost", 11211);
}
MemCached(const string host, const int port) {
apr_pool_create(&pool, NULL);
apr_memcache_create(pool, 1, 0, &mc);
init(host, port);
}
~MemCached() {
apr_pool_destroy(pool);
}
private:
apr_pool_t* pool;
apr_memcache_t* mc;
friend const failable<bool> post(const value& key, const value& val, const MemCached& cache);
friend const failable<bool> put(const value& key, const value& val, const MemCached& cache);
friend const failable<value> get(const value& key, const MemCached& cache);
friend const failable<bool> del(const value& key, const MemCached& cache);
/**
* Initialize the memcached context.
*/
const failable<bool> init(const string& host, const int port) {
apr_memcache_server_t *server;
const apr_status_t sc = apr_memcache_server_create(pool, c_str(host), (apr_port_t)port, 0, 1, 1, 60, &server);
if (sc != APR_SUCCESS)
return mkfailure<bool>("Could not create server");
const apr_status_t as = apr_memcache_add_server(mc, server);
if (as != APR_SUCCESS)
return mkfailure<bool>("Could not add server");
return true;
}
};
/**
* Post a new item to the cache.
*/
const failable<bool> post(const value& key, const value& val, const MemCached& cache) {
debug(key, "cache::post::key");
debug(val, "cache::post::value");
const string ks(scheme::writeValue(key));
const string vs(scheme::writeValue(val));
const apr_status_t rc = apr_memcache_add(cache.mc, c_str(ks), const_cast<char*>(c_str(vs)), length(vs), 0, 27);
if (rc != APR_SUCCESS)
return mkfailure<bool>("Could not add entry");
debug(true, "cache::post::result");
return true;
}
/**
* Update an item in the cache. If the item doesn't exist it is added.
*/
const failable<bool> put(const value& key, const value& val, const MemCached& cache) {
debug(key, "cache::put::key");
debug(val, "cache::put::value");
const string ks(scheme::writeValue(key));
const string vs(scheme::writeValue(val));
const apr_status_t rc = apr_memcache_set(cache.mc, c_str(ks), const_cast<char*>(c_str(vs)), length(vs), 0, 27);
if (rc != APR_SUCCESS)
return mkfailure<bool>("Could not add entry");
debug(true, "cache::put::result");
return true;
}
/**
* Get an item from the cache.
*/
const failable<value> get(const value& key, const MemCached& cache) {
debug(key, "cache::get::key");
const string ks(scheme::writeValue(key));
apr_pool_t* vpool;
const apr_status_t pc = apr_pool_create(&vpool, cache.pool);
if (pc != APR_SUCCESS)
return mkfailure<value>("Could not allocate memory");
char *data;
apr_size_t size;
const apr_status_t rc = apr_memcache_getp(cache.mc, cache.pool, c_str(ks), &data, &size, NULL);
if (rc != APR_SUCCESS) {
apr_pool_destroy(vpool);
return mkfailure<value>("Could not get entry");
}
const value val(scheme::readValue(string(data, size)));
apr_pool_destroy(vpool);
debug(val, "cache::get::result");
return val;
}
/**
* Delete an item from the cache
*/
const failable<bool> del(const value& key, const MemCached& cache) {
debug(key, "cache::delete::key");
const string ks(scheme::writeValue(key));
const apr_status_t rc = apr_memcache_delete(cache.mc, c_str(ks), 0);
if (rc != APR_SUCCESS)
return mkfailure<bool>("Could not delete entry");
debug(true, "cache::delete::result");
return true;
}
}
}
#endif /* tuscany_mcache_hpp */
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