Examples of org.apache.hivemind.service.ClassFab

org.apache.hivemind.service.ClassFab
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Method bodies look largely like Java. References to java classes must be fully qualified. Several special variables are used:
- $0 first parameter, equivalent to this in Java code (and can't be used when creating a static method)
- $1, $2, ... actual parameters to the method
- $args all the parameters as an Object[]
- $r the return type of the method, typically used as return ($r) .... $r is valid with method that return void. This also handles conversions between wrapper types and primitive types.
- $w conversion from primitive type to wrapper type, used as ($w) foo() where foo() returns a primitive type and a wrapper type is needed
@author Howard Lewis Ship

        }
    }


    public void testInvalidField() throws Exception
    {
        ClassFab cf = newClassFab("InvalidField", Object.class);


        cf.addField(".", String.class);
        cf.addField("buffy", int.class);
        cf.addField("", int.class);


        try
        {
            cf.createClass();
            unreachable();
        }
        catch (ApplicationRuntimeException ex)
        {
            assertExceptionSubstring(ex, "Unable to create class InvalidField");

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        Class serviceInterfaceClass = stack.getServiceInterface();
        Module module = stack.getServiceModule();


        String name = ClassFabUtils.generateClassName("Interceptor");


        ClassFab classFab = _factory.newClass(name, Object.class, module);


        classFab.addInterface(serviceInterfaceClass);


        createInfrastructure(stack, classFab);


        addServiceMethods(stack, classFab, parameters);


        return classFab.createClass();
    }

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        assertNull(cf.getMethodFab(new MethodSignature(void.class, "skip", null, null)));
    }


    public void testExtendMethod() throws Exception
    {
        ClassFab cf = newClassFab("ExtendMethod", Object.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "getValue",
                null, null), "return 1;");


        mf.extend("return 2 * $_;", false);


        Object bean = cf.createClass().newInstance();


        assertEquals(new Integer(2), PropertyUtils.read(bean, "value"));
    }

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        assertEquals(new Integer(2), PropertyUtils.read(bean, "value"));
    }


    public void testExtendMethodAlterReturn() throws Exception
    {
        ClassFab cf = newClassFab("ExtendMethodAlterReturn", Object.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "getValue",
                null, null), "return 2;");


        mf.extend("$_ = 3 * $_;", false);


        Object bean = cf.createClass().newInstance();


        assertEquals(new Integer(6), PropertyUtils.read(bean, "value"));
    }

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        assertEquals(new Integer(6), PropertyUtils.read(bean, "value"));
    }


    public void testExtendMethodFailure() throws Exception
    {
        ClassFab cf = newClassFab("ExtendMethodFailure", Object.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "getValue",
                null, null), "return 1;");


        try
        {
            mf.extend("$_ =", true);

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        }
    }


    public void testDupeMethodAdd() throws Exception
    {
        ClassFab cf = newClassFab("DupeMethodAdd", Object.class);


        cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "foo", null, null), "{}");


        try
        {
            cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "foo", null, null), "{}");
            unreachable();
        }
        catch (ApplicationRuntimeException ex)
        {
            assertEquals("Attempt to redefine method void foo() of class DupeMethodAdd.", ex

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        }
    }


    public void testBadConstructor() throws Exception
    {
        ClassFab cf = newClassFab("BadConstructor", Object.class);


        try
        {
            cf.addConstructor(null, null, " woops!");
        }
        catch (ApplicationRuntimeException ex)
        {
            assertExceptionSubstring(ex, "Unable to add constructor to class BadConstructor");
        }

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    }


    public void testCatchException() throws Exception
    {
        ClassFab cf = newClassFab("Fail", Object.class);


        cf.addInterface(FailService.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "fail", null,
                null), "throw new java.lang.RuntimeException(\"Ouch!\");");


        mf.addCatch(RuntimeException.class, "throw new java.io.IOException($e.getMessage());");


        Class targetClass = cf.createClass();


        FailService fs = (FailService) targetClass.newInstance();


        try
        {

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        }
    }


    public void testBadCatch() throws Exception
    {
        ClassFab cf = newClassFab("BadCatch", Object.class);


        cf.addInterface(Runnable.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "run", null,
                null), "return;");


        try
        {
            mf.addCatch(RuntimeException.class, "woops!");

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        }
    }


    public void testInvalidField() throws Exception
    {
        ClassFab cf = newClassFab("InvalidField", Object.class);


        cf.addField(".", String.class);
        cf.addField("buffy", int.class);
        cf.addField("", int.class);


        try
        {
            cf.createClass();
            unreachable();
        }
        catch (ApplicationRuntimeException ex)
        {
            assertExceptionSubstring(ex, "Unable to create class InvalidField");

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