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Refactoring

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This commit is contained in:
Thibaud Gasser
2019-01-03 00:07:26 +01:00
parent 4cde30a6e0
commit a30e86016c
18 changed files with 101 additions and 84 deletions
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8
persistence/src/main/java/fr/gasser/daoexample/dao/Dao.java
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@ -1,16 +1,16 @@
package fr.gasser.daoexample.dao;
import fr.gasser.daoexample.model.Entity;
import fr.gasser.daoexample.sql.Connection;
import fr.gasser.daoexample.dao.connection.ConnectionWrapper;
import java.util.List;
public abstract class Dao<T extends Entity> {
protected Connection connection;
protected final ConnectionWrapper connectionWrapper;
public Dao(Connection connection) {
this.connection = connection;
protected Dao(ConnectionWrapper connectionWrapper) {
this.connectionWrapper = connectionWrapper;
}
public abstract boolean create(T obj);

3
persistence/src/main/java/fr/gasser/daoexample/dao/DaoAbstractFactory.java
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@ -1,5 +1,8 @@
package fr.gasser.daoexample.dao;
import fr.gasser.daoexample.dao.dummy.DaoFactory;
import fr.gasser.daoexample.dao.dummy.FactoryType;
import fr.gasser.daoexample.dao.sqlite.SqliteDaoFactory;
import fr.gasser.daoexample.model.Discipline;
import fr.gasser.daoexample.model.Student;
import fr.gasser.daoexample.model.Teacher;

26
persistence/src/main/java/fr/gasser/daoexample/dao/DaoFactory.java
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@ -1,26 +0,0 @@
package fr.gasser.daoexample.dao;
import fr.gasser.daoexample.model.Discipline;
import fr.gasser.daoexample.model.Student;
import fr.gasser.daoexample.model.Teacher;
import fr.gasser.daoexample.sql.Connection;
import fr.gasser.daoexample.sql.DummyConnection;
public class DaoFactory implements DaoAbstractFactory {
private static Connection connection = new DummyConnection();
@Override
public Dao<Student> createStudentDao() {
return new StudentDao(DaoFactory.connection);
}
@Override
public Dao<Teacher> createTeacherDao() {
return new TeacherDao(DaoFactory.connection);
}
@Override
public Dao<Discipline> createDisciplineDao() {
return new DisciplineDao(DaoFactory.connection);
}
}

10
persistence/src/main/java/fr/gasser/daoexample/dao/XmlDaoFactory.java
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@ -1,18 +1,22 @@
package fr.gasser.daoexample.dao;
import fr.gasser.daoexample.model.Discipline;
import fr.gasser.daoexample.model.Student;
import fr.gasser.daoexample.model.Teacher;
public class XmlDaoFactory implements DaoAbstractFactory {
@Override
public StudentDao createStudentDao() {
public Dao<Student> createStudentDao() {
return null;
}
@Override
public TeacherDao createTeacherDao() {
public Dao<Teacher> createTeacherDao() {
return null;
}
@Override
public DisciplineDao createDisciplineDao() {
public Dao<Discipline> createDisciplineDao() {
return null;
}
}

11
persistence/src/main/java/fr/gasser/daoexample/dao/connection/ConnectionWrapper.java Normal file
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@ -0,0 +1,11 @@
package fr.gasser.daoexample.dao.connection;
import java.sql.SQLException;
public interface ConnectionWrapper {
void connect() throws SQLException;
void close() throws SQLException;
java.sql.Connection getConnection();
}

18
persistence/src/main/java/fr/gasser/daoexample/dao/connection/DummyConnectionWrapper.java Normal file
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@ -0,0 +1,18 @@
package fr.gasser.daoexample.dao.connection;
public class DummyConnectionWrapper implements ConnectionWrapper {
@Override
public void connect() {
}
@Override
public void close() {
}
@Override
public java.sql.Connection getConnection() {
return null;
}
}

9
persistence/src/main/java/fr/gasser/daoexample/dao/connection/SQLiteConnectionException.java Normal file
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@ -0,0 +1,9 @@
package fr.gasser.daoexample.dao.connection;
import java.sql.SQLException;
class SQLiteConnectionException extends SQLException {
public SQLiteConnectionException(String message) {
super(message);
}
}

47
persistence/src/main/java/fr/gasser/daoexample/dao/connection/SQLiteConnectionWrapper.java Normal file
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@ -0,0 +1,47 @@
package fr.gasser.daoexample.dao.connection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.sql.DriverManager;
import java.sql.SQLException;
public class SQLiteConnectionWrapper implements ConnectionWrapper {
private static final Logger LOGGER = LoggerFactory.getLogger(SQLiteConnectionWrapper.class);
private final String dbpath;
private java.sql.Connection connection = null;
private SQLiteConnectionWrapper(String dBPath) {
dbpath = dBPath;
}
public SQLiteConnectionWrapper() {
this(":memory:");
}
@Override
public void connect() throws SQLiteConnectionException {
try {
Class.forName("org.sqlite.JDBC");
connection = DriverManager.getConnection("jdbc:sqlite:" + dbpath);
LOGGER.info("Connected to {} successfully.", dbpath);
} catch (ClassNotFoundException | SQLException e) {
throw new SQLiteConnectionException(e.getMessage());
}
}
@Override
public void close() {
try {
connection.close();
} catch (SQLException e) {
LOGGER.error("Unable to close the connection.", e);
}
}
@Override
public java.sql.Connection getConnection() {
return connection;
}
}

28
persistence/src/main/java/fr/gasser/daoexample/dao/dummy/DaoFactory.java Normal file
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@ -0,0 +1,28 @@
package fr.gasser.daoexample.dao.dummy;
import fr.gasser.daoexample.dao.Dao;
import fr.gasser.daoexample.dao.DaoAbstractFactory;
import fr.gasser.daoexample.model.Discipline;
import fr.gasser.daoexample.model.Student;
import fr.gasser.daoexample.model.Teacher;
import fr.gasser.daoexample.dao.connection.ConnectionWrapper;
import fr.gasser.daoexample.dao.connection.DummyConnectionWrapper;
public class DaoFactory implements DaoAbstractFactory {
private static final ConnectionWrapper CONNECTION_WRAPPER = new DummyConnectionWrapper();
@Override
public Dao<Student> createStudentDao() {
return new StudentDao(DaoFactory.CONNECTION_WRAPPER);
}
@Override
public Dao<Teacher> createTeacherDao() {
return new TeacherDao(DaoFactory.CONNECTION_WRAPPER);
}
@Override
public Dao<Discipline> createDisciplineDao() {
return new DisciplineDao(DaoFactory.CONNECTION_WRAPPER);
}
}

9
persistence/src/main/java/fr/gasser/daoexample/dao/DisciplineDao.java → persistence/src/main/java/fr/gasser/daoexample/dao/dummy/DisciplineDao.java
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@ -1,7 +1,8 @@
package fr.gasser.daoexample.dao;
package fr.gasser.daoexample.dao.dummy;
import fr.gasser.daoexample.dao.Dao;
import fr.gasser.daoexample.model.Discipline;
import fr.gasser.daoexample.sql.Connection;
import fr.gasser.daoexample.dao.connection.ConnectionWrapper;
import java.util.ArrayList;
import java.util.Arrays;
@ -16,8 +17,8 @@ public class DisciplineDao extends Dao<Discipline> {
new Discipline(2, "Qsdf")
));
public DisciplineDao(Connection connection) {
super(connection);
public DisciplineDao(ConnectionWrapper connectionWrapper) {
super(connectionWrapper);
}
@Override

2
persistence/src/main/java/fr/gasser/daoexample/dao/FactoryType.java → persistence/src/main/java/fr/gasser/daoexample/dao/dummy/FactoryType.java
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@ -1,4 +1,4 @@
package fr.gasser.daoexample.dao;
package fr.gasser.daoexample.dao.dummy;
public enum FactoryType {
DaoFactory,

9
persistence/src/main/java/fr/gasser/daoexample/dao/StudentDao.java → persistence/src/main/java/fr/gasser/daoexample/dao/dummy/StudentDao.java
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@ -1,7 +1,8 @@
package fr.gasser.daoexample.dao;
package fr.gasser.daoexample.dao.dummy;
import fr.gasser.daoexample.dao.Dao;
import fr.gasser.daoexample.model.Student;
import fr.gasser.daoexample.sql.Connection;
import fr.gasser.daoexample.dao.connection.ConnectionWrapper;
import java.util.ArrayList;
import java.util.Arrays;
@ -16,8 +17,8 @@ public class StudentDao extends Dao<Student> {
new Student(2, "Qsdf", "Jklm"))
);
StudentDao(Connection connection) {
super(connection);
StudentDao(ConnectionWrapper connectionWrapper) {
super(connectionWrapper);
}
@Override

9
persistence/src/main/java/fr/gasser/daoexample/dao/TeacherDao.java → persistence/src/main/java/fr/gasser/daoexample/dao/dummy/TeacherDao.java
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@ -1,7 +1,8 @@
package fr.gasser.daoexample.dao;
package fr.gasser.daoexample.dao.dummy;
import fr.gasser.daoexample.dao.Dao;
import fr.gasser.daoexample.model.Teacher;
import fr.gasser.daoexample.sql.Connection;
import fr.gasser.daoexample.dao.connection.ConnectionWrapper;
import java.util.ArrayList;
import java.util.Arrays;
@ -16,8 +17,8 @@ public class TeacherDao extends Dao<Teacher> {
new Teacher(2, "Sit", "Amet"))
);
TeacherDao(Connection connection) {
super(connection);
TeacherDao(ConnectionWrapper connectionWrapper) {
super(connectionWrapper);
}
@Override

10
persistence/src/main/java/fr/gasser/daoexample/dao/SqliteDaoFactory.java → persistence/src/main/java/fr/gasser/daoexample/dao/sqlite/SqliteDaoFactory.java
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@ -1,14 +1,16 @@
package fr.gasser.daoexample.dao;
package fr.gasser.daoexample.dao.sqlite;
import fr.gasser.daoexample.dao.Dao;
import fr.gasser.daoexample.dao.DaoAbstractFactory;
import fr.gasser.daoexample.model.Discipline;
import fr.gasser.daoexample.model.Student;
import fr.gasser.daoexample.model.Teacher;
import fr.gasser.daoexample.sql.Connection;
import fr.gasser.daoexample.sql.SQLiteConnection;
import fr.gasser.daoexample.dao.connection.ConnectionWrapper;
import fr.gasser.daoexample.dao.connection.SQLiteConnectionWrapper;
public class SqliteDaoFactory implements DaoAbstractFactory {
private static Connection conn = new SQLiteConnection();
private static final ConnectionWrapper conn = new SQLiteConnectionWrapper();
@Override
public Dao<Student> createStudentDao() {

31
persistence/src/main/java/fr/gasser/daoexample/dao/StudentSQLiteDao.java → persistence/src/main/java/fr/gasser/daoexample/dao/sqlite/StudentSQLiteDao.java
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@ -1,7 +1,10 @@
package fr.gasser.daoexample.dao;
package fr.gasser.daoexample.dao.sqlite;
import fr.gasser.daoexample.dao.Dao;
import fr.gasser.daoexample.dao.DaoAbstractFactory;
import fr.gasser.daoexample.dao.dummy.FactoryType;
import fr.gasser.daoexample.model.Student;
import fr.gasser.daoexample.sql.Connection;
import fr.gasser.daoexample.dao.connection.ConnectionWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -16,18 +19,18 @@ public class StudentSQLiteDao extends Dao<Student> {
private static final Logger LOGGER = LoggerFactory.getLogger(StudentSQLiteDao.class);
public StudentSQLiteDao(Connection connection) {
super(connection);
StudentSQLiteDao(ConnectionWrapper connectionWrapper) {
super(connectionWrapper);
try {
connection.connect();
dropAndCreateTable(connection);
connectionWrapper.connect();
dropAndCreateTable(connectionWrapper);
} catch (SQLException e) {
LOGGER.error("Unable to connect to the database.", e);
}
}
private void dropAndCreateTable(Connection connection) throws SQLException {
try (Statement st = connection.getConnection().createStatement()) {
private void dropAndCreateTable(ConnectionWrapper connectionWrapper) throws SQLException {
try (Statement st = connectionWrapper.getConnection().createStatement()) {
st.setQueryTimeout(30); // set timeout to 30 sec.
st.executeUpdate("DROP TABLE IF EXISTS students");
// In SQLite, table rows normally have a 64-bit signed integer ROWID
@ -41,7 +44,7 @@ public class StudentSQLiteDao extends Dao<Student> {
@Override
public boolean create(Student obj) {
final String sql = "INSERT INTO students (name, surname) VALUES (?, ?)";
try (PreparedStatement st = connection.getConnection().prepareStatement(sql)) {
try (PreparedStatement st = connectionWrapper.getConnection().prepareStatement(sql)) {
st.setObject(1, obj.getName());
st.setObject(2, obj.getSurname());
final int ret = st.executeUpdate();
@ -55,7 +58,7 @@ public class StudentSQLiteDao extends Dao<Student> {
@Override
public Student find(int id) {
try (PreparedStatement st = connection.getConnection().prepareStatement("SELECT rowid,* FROM students WHERE rowid = ?")) {
try (PreparedStatement st = connectionWrapper.getConnection().prepareStatement("SELECT rowid,* FROM students WHERE rowid = ?")) {
st.setObject(1, id);
final ResultSet rs = st.executeQuery();
final String name = rs.getString("name");
@ -70,7 +73,7 @@ public class StudentSQLiteDao extends Dao<Student> {
@Override
public List<Student> findAll() {
List<Student> results = new ArrayList<>();
try (Statement st = connection.getConnection().createStatement()) {
try (Statement st = connectionWrapper.getConnection().createStatement()) {
ResultSet rs = st.executeQuery("select rowid,* from students");
while (rs.next()) {
final int id = rs.getInt("rowid");
@ -86,7 +89,7 @@ public class StudentSQLiteDao extends Dao<Student> {
@Override
public boolean update(Student obj) {
try (PreparedStatement st = connection.getConnection().prepareStatement("UPDATE students SET name = ?, surname = ? WHERE rowid = ?")) {
try (PreparedStatement st = connectionWrapper.getConnection().prepareStatement("UPDATE students SET name = ?, surname = ? WHERE rowid = ?")) {
st.setString(1, obj.getName());
st.setString(2, obj.getSurname());
st.setInt(3, obj.getId());
@ -101,7 +104,7 @@ public class StudentSQLiteDao extends Dao<Student> {
@Override
public boolean delete(Student obj) {
String deleteSQL = "DELETE FROM students WHERE rowid = ?";
try (PreparedStatement st = connection.getConnection().prepareStatement(deleteSQL)) {
try (PreparedStatement st = connectionWrapper.getConnection().prepareStatement(deleteSQL)) {
st.setInt(1, obj.getId());
st.executeUpdate();
return true;
@ -114,7 +117,7 @@ public class StudentSQLiteDao extends Dao<Student> {
/**
* Quick testing of CRUD operations
* @param args
* TODO: write some unit tests
*/
public static void main(String[] args) {
DaoAbstractFactory df = DaoAbstractFactory.createFactory(FactoryType.SqliteDaoFactory);