Added kyotodatabase code.

We should probably turn Database into an interface.

2 files changed, 192 insertions, 0 deletions

diff --git a/store/kyotodatabase.cpp b/store/kyotodatabase.cpp
new file mode 100644
index 0000000..542667a
--- /dev/null
+++ b/store/kyotodatabase.cpp
@@ -0,0 +1,164 @@
+#include "database.h"
+
+#include <iostream>
+
+#include <QAtomicInt>
+#include <QDebug>
+#include <QDir>
+#include <QFileInfo>
+#include <QReadWriteLock>
+#include <QString>
+#include <QTime>
+
+#include <kchashdb.h>
+
+class Database::Private
+{
+public:
+    Private(const QString &storageRoot, const QString &name);
+    ~Private();
+
+    kyotocabinet::TreeDB db;
+    bool dbOpen;
+    bool inTransaction;
+};
+
+Database::Private::Private(const QString &storageRoot, const QString &name)
+    : inTransaction(false)
+{
+    QDir dir;
+    dir.mkdir(storageRoot);
+
+    //create file
+    dbOpen = db.open((storageRoot + "/" + name + ".kch").toStdString(), kyotocabinet::BasicDB::OWRITER | kyotocabinet::BasicDB::OCREATE);
+    if (!dbOpen) {
+        // TODO: handle error
+    }
+}
+
+Database::Private::~Private()
+{
+    if (dbOpen && inTransaction) {
+        db.end_transaction(false);
+    }
+}
+
+Database::Database(const QString &storageRoot, const QString &name)
+    : d(new Private(storageRoot, name))
+{
+}
+
+Database::~Database()
+{
+    delete d;
+}
+
+bool Database::isInTransaction() const
+{
+    return d->inTransaction;
+}
+
+bool Database::startTransaction(TransactionType type)
+{
+    if (!d->dbOpen) {
+        return false;
+    }
+
+    if (d->inTransaction) {
+        return true;
+    }
+
+    //TODO handle errors
+    d->inTransaction = d->db.begin_transaction();
+    return d->inTransaction;
+}
+
+bool Database::commitTransaction()
+{
+    if (!d->dbOpen) {
+        return false;
+    }
+
+    if (!d->inTransaction) {
+        return false;
+    }
+
+    bool success = d->db.end_transaction(true);
+    d->inTransaction = false;
+    return success;
+}
+
+void Database::abortTransaction()
+{
+    if (!d->dbOpen || !d->inTransaction) {
+        return;
+    }
+
+    d->db.end_transaction(false);
+    d->inTransaction = false;
+}
+
+bool Database::write(const char *key, size_t keySize, const char *value, size_t valueSize)
+{
+    if (!d->dbOpen) {
+        return false;
+    }
+
+    bool success = d->db.set(key, keySize, value, valueSize);
+    return success; 
+}
+
+bool Database::write(const std::string &sKey, const std::string &sValue)
+{
+    if (!d->dbOpen) {
+        return false;
+    }
+
+    bool success = d->db.set(sKey, sValue);
+    return success; 
+}
+
+void Database::read(const std::string &sKey, const std::function<void(const std::string &value)> &resultHandler)
+{
+    if (!d->dbOpen) {
+        return;
+    }
+
+    std::string value;
+    if (d->db.get(sKey, &value)) {
+        resultHandler(value);
+    }
+}
+
+void Database::read(const std::string &sKey, const std::function<void(void *ptr, int size)> &resultHandler)
+{
+    if (!d->dbOpen) {
+        return;
+    }
+
+    size_t valueSize;
+    char *valueBuffer = d->db.get(sKey.data(), sKey.size(), &valueSize);
+    resultHandler(valueBuffer, valueSize);
+    delete[] valueBuffer;
+}
+
+qint64 Database::diskUsage() const
+{
+    if (!d->dbOpen) {
+        return 0;
+    }
+
+    QFileInfo info(QString::fromStdString(d->db.path()));
+    return info.size();
+}
+
+void Database::removeFromDisk() const
+{
+    if (!d->dbOpen) {
+        return;
+    }
+
+   QFileInfo info(QString::fromStdString(d->db.path()));
+   QDir dir = info.dir();
+   dir.remove(info.fileName());
+}
diff --git a/store/kyotodatabase.h b/store/kyotodatabase.h
new file mode 100644
index 0000000..e752ff5
--- /dev/null
+++ b/store/kyotodatabase.h
@@ -0,0 +1,28 @@
+#pragma once
+
+#include <string>
+#include <QString>
+
+class Database {
+public:
+    enum TransactionType { ReadOnly, ReadWrite };
+
+    Database(const QString &storageRoot, const QString &name);
+    ~Database();
+    bool isInTransaction() const;
+    bool startTransaction(TransactionType type = ReadWrite);
+    bool commitTransaction();
+    void abortTransaction();
+    bool write(const char *key, size_t keySize, const char *value, size_t valueSize);
+    bool write(const std::string &sKey, const std::string &sValue);
+    //Perhaps prefer iterators (assuming we need to be able to match multiple values
+    void read(const std::string &sKey, const std::function<void(const std::string &value)> &);
+    void read(const std::string &sKey, const std::function<void(void *ptr, int size)> &);
+
+    qint64 diskUsage() const;
+    void removeFromDisk() const;
+private:
+    class Private;
+    Private * const d;
+};
+