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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() : owner(false) {
+    }
+
+    MemCached(const string host, const int port) : owner(true) {
+        apr_pool_create(&pool, NULL);
+        apr_memcache_create(pool, 1, 0, &mc);
+        init(host, port);
+    }
+
+    MemCached(const MemCached& c) : owner(false) {
+        pool = c.pool;
+        mc = c.mc;
+    }
+
+    ~MemCached() {
+        if (!owner)
+            return;
+        apr_pool_destroy(pool);
+    }
+
+private:
+    bool owner;
+    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 */