Add a test file-based database component.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1043296 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 142 insertions, 0 deletions

diff --git a/sca-cpp/trunk/components/filedb/filedb.hpp b/sca-cpp/trunk/components/filedb/filedb.hpp
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+++ b/sca-cpp/trunk/components/filedb/filedb.hpp
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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_filedb_hpp
+#define tuscany_filedb_hpp
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "string.hpp"
+#include "list.hpp"
+#include "value.hpp"
+#include "monad.hpp"
+#include "fstream.hpp"
+#include "../../modules/scheme/eval.hpp"
+
+namespace tuscany {
+namespace filedb {
+
+/**
+ * Represents a FileDB connection.
+ */
+class FileDB {
+public:
+    FileDB() : owner(false) {
+    }
+
+    FileDB(const string& name) : owner(true), name(name) {
+    }
+
+    FileDB(const FileDB& c) : owner(false), name(c.name) {
+    }
+
+    ~FileDB() {
+    }
+
+private:
+    bool owner;
+    string name;
+
+    friend const string dbname(const FileDB& db);
+};
+
+/**
+ * Return the name of the database.
+ */
+const string dbname(const FileDB& db) {
+    return db.name;
+}
+
+/**
+ * Convert a key to a file name.
+ */
+const string filename(const value& key, const FileDB& db) {
+    return dbname(db) + "/" + scheme::writeValue(key);
+}
+
+/**
+ * Post a new item to the database.
+ */
+const failable<bool> post(const value& key, const value& val, FileDB& db) {
+    debug(key, "filedb::post::key");
+    debug(val, "filedb::post::value");
+    debug(dbname(db), "filedb::post::dbname");
+
+    ofstream os(filename(key, db));
+    const string vs(scheme::writeValue(val));
+    os << vs;
+
+    debug(true, "filedb::post::result");
+    return true;
+}
+
+/**
+ * Update an item in the database. If the item doesn't exist it is added.
+ */
+const failable<bool> put(const value& key, const value& val, FileDB& db) {
+    debug(key, "filedb::put::key");
+    debug(val, "filedb::put::value");
+    debug(dbname(db), "filedb::put::dbname");
+
+    ofstream os(filename(key, db));
+    const string vs(scheme::writeValue(val));
+    os << vs;
+
+    debug(true, "filedb::put::result");
+    return true;
+}
+
+/**
+ * Get an item from the database.
+ */
+const failable<value> get(const value& key, FileDB& db) {
+    debug(key, "filedb::get::key");
+    debug(dbname(db), "filedb::get::dbname");
+
+    ifstream is(filename(key, db));
+    if (is.fail())
+        return mkfailure<value>("Couldn't get file database entry.");
+    const value val(scheme::readValue(is));
+
+    debug(val, "filedb::get::result");
+    return val;
+}
+
+/**
+ * Delete an item from the database
+ */
+const failable<bool> del(const value& key, FileDB& db) {
+    debug(key, "filedb::delete::key");
+    debug(dbname(db), "filedb::delete::dbname");
+
+    const int rc = unlink(c_str(filename(key, db)));
+    if (rc == -1)
+        return mkfailure<bool>("Couldn't delete file database entry.");
+    debug(true, "filedb::delete::result");
+    return true;
+}
+
+}
+}
+
+#endif /* tuscany_filedb_hpp */