[编织消息框架][JAVA核心技术]动态代理应用7-实现设计

Posted 2020-09-09 solq321

根据设计生成两个接口，IRpcSend send方法返回数据要求包装成QResult对象

public interface IRpcSend {
    public <T> QResult<T> send(byte command, Object... args);
}

public interface IRpcReceive {
    public <T> T receive(byte command, Object... args);
}

public interface IRpcContext {
    RpcContext getContext();
    void setContext(RpcContext ctx);
}

public interface QResult<T> extends Future<T> {

    /**
     * 是否出错
     * */
    public boolean isError();
    /**
     * 获取返回结果
     * */   
    public T getResult();
    /**
     * 设置结果
     * */  
    public void setResult(T result);
}

 1 @SuppressWarnings("unchecked")
 2 public abstract class QRpcFactory {
 3     private static Method SEND_METHOD = ReflectUtil.getMethod(IRpcSend.class, "send");
 4     private static Method RECEIVE_METHOD = ReflectUtil.getMethod(IRpcReceive.class, "receive");
 5 
 6     private static Map<Short, Class<?>> SEND_CLASS = new HashMap<>();
 7     private static Map<Short, IRpcReceive> RECEIVE = new HashMap<>();
 8 
 9     public static <T> T loadSendProxy(Class<T> target, QNode... nodes) {
10         T ret = loadSendPorxy0(target);
11         IRpcContext ctx = (IRpcContext) ret;
12         ctx.setContext(RpcContext.of(nodes));
13         return ret;
14     }
15 
16     public static <T> T loadSendProxy(Class<T> target, Long... ids) {
17     T ret = loadSendPorxy0(target);
18     IRpcContext ctx = (IRpcContext) ret;
19     ctx.setContext(RpcContext.of(ids));
20     return ret;
21     }
22 
23     public static <T> T loadSendProxy(Class<T> target, String... addresses) {
24         T ret = loadSendPorxy0(target);
25         IRpcContext ctx = (IRpcContext) ret;
26         ctx.setContext(RpcContext.of(addresses));
27         return ret;
28     }
29 
30     private static <T> T loadSendPorxy0(Class<T> target) {
31         QModel modelAnno = ReflectUtil.getAnno(target, QModel.class);
32         Class<?> proxyClass = SEND_CLASS.get(modelAnno.value());
33         T ret = null;
34         try {
35             ret = (T) proxyClass.newInstance();
36         } catch (InstantiationException | IllegalAccessException e) {
37             throw new RuntimeException(e);
38         }
39         return ret;
40     }
41 
42     public static <T> T loadLocalProxy(Class<T> target) {
43         QModel modelAnno = ReflectUtil.getAnno(target, QModel.class);
44         Object ret = RECEIVE.get(modelAnno.value());
45         return (T) ret;
46     }
47 
48     public static IRpcReceive loadReceiveProxy(short model) {
49         IRpcReceive ret = RECEIVE.get(model);
50         return ret;
51     }
52 }

QRpcFactory

 1  // register
 2     public static void registerSendProxy(Class<?> target) {
 3     if (!target.isInterface()) {
 4         throw new RuntimeException("class is not  Interface : " + target);
 5     }
 6     QModel modelAnno = ReflectUtil.getAnno(target, QModel.class);
 7     String proxyClassName = target.getCanonicalName() + "$$$$";
 8     ClassPool classPool = JavassistHepler.classPool;
 9     CtClass ctClass = classPool.makeClass(proxyClassName);
10 
11     try {
12         // 设置接口
13         CtClass[] interfaces = new CtClass[3];
14         interfaces[0] = classPool.get(target.getName());
15         interfaces[1] = classPool.get(IRpcSend.class.getName());
16         interfaces[2] = classPool.get(IRpcContext.class.getName());
17         ctClass.setInterfaces(interfaces);
18 
19         {
20         // 添加ctx字段
21         final String ctxName = RpcContext.class.getName();
22         CtField ctField = new CtField(classPool.get(ctxName), "ctx", ctClass);
23         ctField.setModifiers(Modifier.PRIVATE);
24         ctClass.addField(ctField);
25         // 添加ctx get set 方法
26         CtMethod ctMethod = CtMethod.make("public " + ctxName + " getContext(){return ctx;}", ctClass);
27         ctMethod.setModifiers(Modifier.PUBLIC);
28         ctClass.addMethod(ctMethod);
29 
30         ctMethod = CtMethod.make("public void setContext(" + ctxName + " value){ ctx =value;}", ctClass);
31         ctMethod.setModifiers(Modifier.PUBLIC);
32         ctClass.addMethod(ctMethod);
33         }
34 
35         // 生成send method 调用静态方法减少书写复杂
36         {
37         Method method = SEND_METHOD;
38         String resultType = " return ($r)";
39         final String body = "{ " + resultType + QRpcFactory3.class.getName() + ".proxy(this,$args, (short)" + modelAnno.value() + "  ,(byte) $1);}";
40 
41         Class<?> returnType = method.getReturnType();
42         CtMethod ctMethod = new CtMethod(classPool.get(returnType.getName()), method.getName(), JavassistHepler.toCtClassArray(method.getParameterTypes()), ctClass);
43         ctMethod.setModifiers(method.getModifiers());
44         ctMethod.setBody(body);
45         ctClass.addMethod(ctMethod);
46         }
47 
48         // 生成代理方法
49         Map<Byte, String> methodMap = new HashMap<>();
50         for (Method method : target.getDeclaredMethods()) {
51         QCommond commond = method.getAnnotation(QCommond.class);
52         if (commond == null) {
53             continue;
54         }
55         methodMap.put(commond.value(), method.getName());
56 
57         String resultType = "";
58         if (void.class != method.getReturnType()) {
59             resultType = " return ($r) ";
60         }
61         final String body = "{ " + resultType + " this.send((byte)" + commond.value() + ",$args); }";
62         Class<?> returnType = method.getReturnType();
63         CtMethod ctMethod = new CtMethod(classPool.get(returnType.getName()), method.getName(), JavassistHepler.toCtClassArray(method.getParameterTypes()), ctClass);
64         ctMethod.setModifiers(method.getModifiers());
65         ctMethod.setBody(body);
66         ctClass.addMethod(ctMethod);
67         }
68 
69         // 保存记录
70         Class<?> ret = ctClass.toClass();
71         ctClass.detach();
72         SEND_CLASS.put(modelAnno.value(), ret);
73 
74     } catch (Exception e) {
75         e.printStackTrace();
76     }
77     }
78 
79     public static QResult proxy(IRpcContext target, Object[] args, short model, byte commondIndex) {
80     System.out.println("model : " + model + " commondIndex : " + commondIndex);
81     return null;
82     }

registerSendProxy

 测试理论：

public class TestRpcSendProxy {
    @QModel(1)
    public interface TestObject {
        @QCommond(1)
        public void a(int a, String b);

        @QCommond(2)
        public void setAge(int value);

        @QCommond(3)
        public QResult<Integer> getAge();
    }

    public static void main(String[] args) {
        QRpcFactory3.registerSendProxy(TestObject.class);
        TestObject proxy = QRpcFactory.loadSendProxy(TestObject.class, 1L);

        proxy.a(1, "b");
        QResult<Integer> ret = proxy.getAge();
    }
}

由于发送处理涉及netty，先不考虑通信处理实现，在实现写框架过程，依赖越少实现越简单。所以每个实例对象构造出来时必须能正常工作