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Diffstat (limited to '')
-rw-r--r-- | sca-cpp/branches/lightweight-sca/components/sqldb/sqldb.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/sca-cpp/branches/lightweight-sca/components/sqldb/sqldb.cpp b/sca-cpp/branches/lightweight-sca/components/sqldb/sqldb.cpp new file mode 100644 index 0000000000..9925897693 --- /dev/null +++ b/sca-cpp/branches/lightweight-sca/components/sqldb/sqldb.cpp @@ -0,0 +1,143 @@ +/* + * 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. + */ + +/* $Rev$ $Date$ */ + +/** + * PostgreSQL-based database component implementation. + */ + +#define WANT_HTTPD_LOG 1 +#include "string.hpp" +#include "function.hpp" +#include "list.hpp" +#include "value.hpp" +#include "monad.hpp" +#include "parallel.hpp" +#include "pgsql.hpp" + +namespace tuscany { +namespace sqldb { + +/** + * Get an item from the database. + */ +const failable<value> get(const list<value>& params, pgsql::PGSql& pg) { + return pgsql::get(car(params), pg); +} + +/** + * Post an item to the database. + */ +const failable<value> post(const list<value>& params, pgsql::PGSql& pg) { + const value id = append<value>(car(params), mklist(mkuuid())); + const failable<bool> val = pgsql::post(id, cadr(params), pg); + if (!hasContent(val)) + return mkfailure<value>(val); + return id; +} + +/** + * Put an item into the database. + */ +const failable<value> put(const list<value>& params, pgsql::PGSql& pg) { + const failable<bool> val = pgsql::put(car(params), cadr(params), pg); + if (!hasContent(val)) + return mkfailure<value>(val); + return value(content(val)); +} + +/** + * Delete an item from the database. + */ +const failable<value> del(const list<value>& params, pgsql::PGSql& pg) { + const failable<bool> val = pgsql::del(car(params), pg); + if (!hasContent(val)) + return mkfailure<value>(val); + return value(content(val)); +} + +/** + * Component implementation lambda function. + */ +class applySqldb { +public: + applySqldb(const perthread_ptr<pgsql::PGSql>& pg) : pg(pg) { + } + + const value operator()(const list<value>& params) const { + const value func(car(params)); + if (func == "get") + return get(cdr(params), *pg); + if (func == "post") + return post(cdr(params), *pg); + if (func == "put") + return put(cdr(params), *pg); + if (func == "delete") + return del(cdr(params), *pg); + return mkfailure<value>(); + } + +private: + const perthread_ptr<pgsql::PGSql> pg; +}; + +/** + * Lambda function that creates a new database connection. + */ +class newPGSql { +public: + newPGSql(const string& conninfo, const string& table) : conninfo(conninfo), table(table) { + } + + const gc_ptr<pgsql::PGSql> operator()() const { + return new (gc_new<pgsql::PGSql>()) pgsql::PGSql(conninfo, table); + } + +private: + const string conninfo; + const string table; +}; + +/** + * Start the component. + */ +const failable<value> start(unused const list<value>& params) { + // Connect to the configured database and table + const value conninfo = ((lambda<value(const list<value>&)>)car(params))(list<value>()); + const value table = ((lambda<value(const list<value>&)>)cadr(params))(list<value>()); + const perthread_ptr<pgsql::PGSql> pg(lambda<gc_ptr<pgsql::PGSql>()>(newPGSql(conninfo, table))); + + // Return the component implementation lambda function + return value(lambda<value(const list<value>&)>(applySqldb(pg))); +} + +} +} + +extern "C" { + +const tuscany::value apply(const tuscany::list<tuscany::value>& params) { + const tuscany::value func(car(params)); + if (func == "start") + return tuscany::sqldb::start(cdr(params)); + return tuscany::mkfailure<tuscany::value>(); +} + +} |