MentaContainer

Compare Revisions

Ignore whitespace Rev 38 → Rev 39

/trunk/src/main/java/org/mentacontainer/impl/GenericComponent.java
10,14 → 10,10
private final Object factory;
private final String name;
private final Method method;
public GenericComponent(String name, Object factory, String methodName) {
public GenericComponent(Object factory, String methodName) {
this.name = name;
this.factory = factory;
try {
48,8 → 44,6
}
}
public String getName() { return name; }
public Component addInitValue(Object value) {
throw new UnsupportedOperationException();
/trunk/src/main/java/org/mentacontainer/impl/MentaComponent.java
18,8 → 18,6
*/
public class MentaComponent implements Component {
private final String name;
private final Class<? extends Object> klass;
private Map<String, Object> props = null;
34,18 → 32,16
private Object singletonValue = null;
 
public MentaComponent(String name, Class<? extends Object> klass, boolean singleton) {
public MentaComponent(Class<? extends Object> klass, boolean singleton) {
this.name = name;
 
this.klass = klass;
this.singleton = singleton;
}
public MentaComponent(String name, Class<? extends Object> klass) {
public MentaComponent(Class<? extends Object> klass) {
this(name, klass, false);
this(klass, false);
}
public boolean isSingleton() { return singleton; }
119,28 → 115,6
return array;
}
public String getName() {
return name;
}
public boolean equals(Object o) {
if (o instanceof MentaComponent) {
MentaComponent c = (MentaComponent) o;
return c.name.equals(this.name);
}
return false;
}
public int hashCode() {
return name.hashCode();
}
/*
* Use reflection to set a property in the bean
*/
/trunk/src/main/java/org/mentacontainer/impl/MentaContainer.java
108,10 → 108,8
}
}
 
public Component ioc(Component component) {
public Component ioc(String key, Component component) {
String key = component.getName();
 
if (beans.containsKey(key)) throw new RuntimeException("Container already set for the bean key: " + key);
 
beans.put(key, component);
121,12 → 119,12
public Component ioc(String key, Class<? extends Object> klass) {
return ioc(new MentaComponent(key, klass));
return ioc(key, new MentaComponent(klass));
}
public Component ioc(String key, Class<? extends Object> klass, boolean singleton) {
return ioc(new MentaComponent(key, klass, singleton));
return ioc(key, new MentaComponent(klass, singleton));
}
 
public Dependency autowire(Dependency d) {
/trunk/src/main/java/org/mentacontainer/Component.java
41,12 → 41,4
* @return true if it is a singleton component
*/
public boolean isSingleton();
/**
* What is the name of this component? The name is used when you request an instance from the container.
*
* @return The name of this component
*/
public String getName();
}
/trunk/src/main/java/org/mentacontainer/Container.java
52,11 → 52,12
/**
* Set up IoC based on the component passed.
*
* @param key The key representing the bean to return. The name of the bean in the container.
* @param component The component for the IoC.
* @return The component passed as a parameter. (Fluent API)
* @see Component
*/
public Component ioc(Component component);
public Component ioc(String key, Component component);
/**
* Configure a bean dependency to be auto-wired by the container. In general you want the
/trunk/src/main/java/org/mentacontainer/example/BasicOperations.java
New file
0,0 → 1,138
package org.mentacontainer.example;
 
import java.util.Date;
 
import org.mentacontainer.Container;
import org.mentacontainer.impl.MentaContainer;
 
public class BasicOperations {
public static void main(String[] args) throws Exception {
case1();
case2();
case3();
case4();
}
private static void case1() {
Container c = new MentaContainer();
c.ioc("myString1", String.class);
String myString1 = (String) c.get("myString1");
System.out.println(myString1); // ==> "" ==> default constructor new String() was used
c.ioc("myString2", String.class).addInitValue("saoj");
String myString2 = (String) c.get("myString2");
System.out.println(myString2); // ==> "saoj" ==> constructor new String("saoj") was used
c.ioc("myDate1", Date.class).addProperty("hours", 15) // setHours(15)
.addProperty("minutes", 10) // setMinutes(10)
.addProperty("seconds", 45); // setSeconds(45)
Date myDate1 = (Date) c.get("myDate1");
System.out.println(myDate1); // ==> a date with time 15:10:45
}
private static void case2() {
Container c = new MentaContainer();
c.ioc("myString", String.class, true /* singleton */).addInitValue("saoj");
String s1 = (String) c.get("myString");
String s2 = (String) c.get("myString");
System.out.println(s1 == s2); // ==> true ==> same instance
System.out.println(s1.equals(s2)); // ==> true => of course
}
public static interface UserDAO {
public String getUsername(int id);
}
public static class Connection {
}
public static class JdbcUserDAO implements UserDAO {
private Connection conn;
public void setConn(Connection conn) { this.conn = conn; }
public String getUsername(int id) {
// connection will be injected by the container...
if (conn == null) throw new IllegalStateException("conn is null!");
// use the connection to get the username...
return "saoj";
}
}
private static void case3() {
Container c = new MentaContainer();
c.ioc("userDAO", JdbcUserDAO.class);
c.ioc("connection", Connection.class); // in real life this would be a connection pool
// or the hibernate SessionFactory
// "conn" = the name of the property
// Connection.class = the type of the property
// "connection" = the source from where the dependency will come from
c.autowire("conn", Connection.class, "connection");
UserDAO userDAO = (UserDAO) c.get("userDAO");
// the container detects that userDAO has a dependency: name = "conn" and type = "Connection.class"
// where does it go to get the dependency to insert?
// In itself: it does a Container.get("connection") => "connection" => the source
System.out.println(userDAO.getUsername(11)); // ==> "saoj" ==> connection is not null as expected...
}
public static class SomeService {
private UserDAO userDAO;
public void setUserDAO(UserDAO userDAO) {
this.userDAO = userDAO;
}
public void doSomething() {
System.out.println(userDAO.getUsername(11));
}
}
private static void case4() throws Exception {
Container c = new MentaContainer();
c.ioc("userDAO", JdbcUserDAO.class);
c.ioc("connection", Connection.class);
c.autowire("conn", Connection.class, "connection");
SomeService service = new SomeService();
c.populate(service); // populate (inject) all properties of SomeService with
// beans from the container
service.doSomething(); // ==> "saoj"
}
}