Package org.codehaus.groovy.runtime
Class ProxyGeneratorAdapter
java.lang.Object
org.objectweb.asm.ClassVisitor
org.codehaus.groovy.runtime.ProxyGeneratorAdapter
public class ProxyGeneratorAdapter
extends org.objectweb.asm.ClassVisitor
A proxy generator responsible for mapping a map of closures to a class implementing a list of interfaces. For
example, the following code:
abstract class Foo {
abstract void bar();
abstract void baz();
}
def dyn = [bar: { println 'hello' }, baz: { println 'world'}] as Foo
will generate a proxy class which extends class Foo and delegates method calls to the provided closures.
The generated proxy implements the GroovyObject interface.
Additionally, this proxy generator supports delegation to another object. In that case, if a method is defined
both in the closure map and the delegate, the version from the map is preferred. This allows overriding methods
from delegates with ease.
Internally, the proxy generator makes use of ASM to generate bytecode, for improved performance as compared
to the legacy proxy generation mechanism which made use of string templates.- Since:
- 2.0.0
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Field Summary
Fields inherited from class org.objectweb.asm.ClassVisitor
api, cv -
Constructor Summary
ConstructorsConstructorDescriptionProxyGeneratorAdapter(Map<Object, Object> closureMap, Class superClass, Class[] interfaces, ClassLoader proxyLoader, boolean emptyBody, Class delegateClass) Construct a proxy generator. -
Method Summary
Modifier and TypeMethodDescriptionstatic ClosureEnsures that the provided object is wrapped into a closure if it's not a closure.protected org.objectweb.asm.MethodVisitormakeDelegateCall(String name, String desc, String signature, String[] exceptions, int accessFlags) Generate a call to the delegate object.protected org.objectweb.asm.MethodVisitormakeDelegateToClosureCall(String name, String desc, String signature, String[] exceptions, int accessFlags) voidvisit(int version, int access, String name, String signature, String superName, String[] interfaces) org.objectweb.asm.MethodVisitorvisitMethod(int access, String name, String desc, String signature, String[] exceptions) Methods inherited from class org.objectweb.asm.ClassVisitor
getDelegate, visitAnnotation, visitAttribute, visitEnd, visitField, visitInnerClass, visitModule, visitNestHost, visitNestMember, visitOuterClass, visitPermittedSubclass, visitRecordComponent, visitSource, visitTypeAnnotation
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Constructor Details
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ProxyGeneratorAdapter
public ProxyGeneratorAdapter(Map<Object, Object> closureMap, Class superClass, Class[] interfaces, ClassLoader proxyLoader, boolean emptyBody, Class delegateClass) Construct a proxy generator. This generator is used when we need to create a proxy object for a class or an interface given a map of closures.- Parameters:
closureMap- the delegates implementationssuperClass- corresponding to the superclass class visitorinterfaces- extra interfaces the proxy should implementproxyLoader- the class loader which should be used to load the generated proxydelegateClass- if not null, generate a delegate field with the corresponding classemptyBody- if set to true, the unimplemented abstract methods will receive an empty body instead of throwing anUnsupportedOperationException.
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Method Details
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visit
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) - Overrides:
visitin classorg.objectweb.asm.ClassVisitor
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visitMethod
public org.objectweb.asm.MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) - Overrides:
visitMethodin classorg.objectweb.asm.ClassVisitor
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makeDelegateCall
protected org.objectweb.asm.MethodVisitor makeDelegateCall(String name, String desc, String signature, String[] exceptions, int accessFlags) Generate a call to the delegate object. -
makeDelegateToClosureCall
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proxy
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delegatingProxy
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ensureClosure
Ensures that the provided object is wrapped into a closure if it's not a closure. Do not trust IDEs, this method is used in bytecode.
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