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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.
*/
/* $Rev$ $Date$ */
/**
* Memcached-based cache component implementation.
*/
#define WANT_HTTPD_LOG 1
#include "string.hpp"
#include "function.hpp"
#include "list.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "memcache.hpp"
namespace tuscany {
namespace cache {
/**
* Get an item from the cache.
*/
const failable<value> get(const list<value>& params, memcache::MemCached& ch) {
return memcache::get(car(params), ch);
}
/**
* Post an item to the cache.
*/
const failable<value> post(const list<value>& params, memcache::MemCached& ch) {
const value id = append<value>(car(params), mklist(mkuuid()));
const failable<bool> val = memcache::post(id, cadr(params), ch);
if (!hasContent(val))
return mkfailure<value>(val);
return id;
}
/**
* Put an item into the cache.
*/
const failable<value> put(const list<value>& params, memcache::MemCached& ch) {
const failable<bool> val = memcache::put(car(params), cadr(params), ch);
if (!hasContent(val))
return mkfailure<value>(val);
return value(content(val));
}
/**
* Delete an item from the cache.
*/
const failable<value> del(const list<value>& params, memcache::MemCached& ch) {
const failable<bool> val = memcache::del(car(params), ch);
if (!hasContent(val))
return mkfailure<value>(val);
return value(content(val));
}
/**
* Component implementation lambda function.
*/
class applyCache {
public:
applyCache(memcache::MemCached& ch) : ch(ch) {
}
const value operator()(const list<value>& params) const {
const value func(car(params));
if (func == "get")
return get(cdr(params), ch);
if (func == "post")
return post(cdr(params), ch);
if (func == "put")
return put(cdr(params), ch);
if (func == "delete")
return del(cdr(params), ch);
return mkfailure<value>();
}
private:
memcache::MemCached& ch;
};
/**
* Convert a list of properties to a list of server addresses.
*/
const list<string> servers(const list<value>& params) {
if (isNil(params))
return list<string>();
const value s = ((lambda<value(const list<value>&)>)car(params))(list<value>());
return cons<string>(s, servers(cdr(params)));
}
/**
* Start the component.
*/
const failable<value> start(const list<value>& params) {
// Connect to memcached
memcache::MemCached& ch = *(new (gc_new<memcache::MemCached>()) memcache::MemCached(servers(params)));
// Return the component implementation lambda function
return value(lambda<value(const list<value>&)>(applyCache(ch)));
}
}
}
extern "C" {
const tuscany::value apply(const tuscany::list<tuscany::value>& params) {
const tuscany::value func(car(params));
if (func == "start")
return tuscany::cache::start(cdr(params));
return tuscany::mkfailure<tuscany::value>();
}
}
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