Class JavaDispatcher<T>

java.lang.Object

net.bytebuddy.utility.dispatcher.JavaDispatcher<T>

Type Parameters:

T - The resolved type.

All Implemented Interfaces:

PrivilegedAction<T>

@Enhance
public class JavaDispatcher<T>
extends Object
implements PrivilegedAction<T>

A dispatcher for creating a proxy that invokes methods of a type that is possibly unknown on the current VM. Dispatchers do not use any of Byte Buddy's regular infrastructure, to avoid bootstrapping issues as these dispatchers are used by Byte Buddy itself.

By default, this dispatcher uses the Java Proxy for creating dispatchers. By setting net.bytebuddy.generate to true, Byte Buddy can generate proxies manually as byte code to mostly avoid reflection and boxing of arguments as arrays.

If a security manager is active, the net.bytebuddy.createJavaDispatcher runtime permission is required. Any dispatching will be executed from a separate class loader and an unnamed module but with the ProtectionDomain of the JavaDispatcher class. It is not permitted to invoke methods of the java.security.AccessController class or to resolve a java.lang.invoke.MethodHandle$Lookup.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static @interface	JavaDispatcher.Container	Indicates that the method is supposed to return an array of the proxied type.
static @interface	JavaDispatcher.Defaults	Indicates that a method is supposed to return a default value if a method or type could not be resolved.
protected static interface	JavaDispatcher.Dispatcher	A dispatcher for handling a proxied method.
protected static class	JavaDispatcher.DynamicClassLoader	A class loader for loading synthetic classes for implementing a JavaDispatcher.
static @interface	JavaDispatcher.Instance	Indicates that a method is supposed to perform an instance check.
static @interface	JavaDispatcher.IsConstructor	Indicates that a proxied method is a constructor.
static @interface	JavaDispatcher.IsStatic	Indicates that a proxied method is static.
static @interface	JavaDispatcher.Proxied	Indicates a proxied type's name.
protected static class	JavaDispatcher.ProxiedInvocationHandler	An invocation handler that invokes given dispatchers.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	GENERATE_PROPERTY	A property to determine, that if true, dispatcher classes will be generated natively and not by using a Proxy.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	JavaDispatcher(Class<T> proxy, ClassLoader classLoader, boolean generate)	Creates a new dispatcher.

Method Summary

Modifier and Type	Method	Description
static <T> PrivilegedAction<T>	of(Class<T> type)	Resolves an action for creating a dispatcher for the provided type where the proxied type is resolved from the bootstrap loader.
static <T> PrivilegedAction<T>	of(Class<T> type, ClassLoader classLoader)	Resolves an action for creating a dispatcher for the provided type.
protected static <T> PrivilegedAction<T>	of(Class<T> type, ClassLoader classLoader, boolean generate)	Resolves an action for creating a dispatcher for the provided type.
T	run()

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

GENERATE_PROPERTY

public static final String GENERATE_PROPERTY

A property to determine, that if true, dispatcher classes will be generated natively and not by using a Proxy.

See Also:

• Constant Field Values

Constructor Details

JavaDispatcher

protected JavaDispatcher(Class<T> proxy,
 @MaybeNull
 ClassLoader classLoader,
 boolean generate)

Creates a new dispatcher.

Parameters:

proxy - The proxy type.

classLoader - The class loader to resolve the proxied type from or null if the bootstrap loader should be used.

generate - true if a proxy class should be manually generated.

Method Details

of

public static <T> PrivilegedAction<T> of(Class<T> type)

Resolves an action for creating a dispatcher for the provided type where the proxied type is resolved from the bootstrap loader.

Type Parameters:

T - The resolved type.

Parameters:

type - The type for which a dispatcher should be resolved.

Returns:

An action for creating an appropriate dispatcher.

of

public static <T> PrivilegedAction<T> of(Class<T> type,
 @MaybeNull
 ClassLoader classLoader)

Resolves an action for creating a dispatcher for the provided type.

Type Parameters:

T - The resolved type.

Parameters:

type - The type for which a dispatcher should be resolved.

classLoader - The class loader to resolve the proxied type from.

Returns:

An action for creating an appropriate dispatcher.

of

protected static <T> PrivilegedAction<T> of(Class<T> type,
 @MaybeNull
 ClassLoader classLoader,
 boolean generate)

Resolves an action for creating a dispatcher for the provided type.

Type Parameters:

T - The resolved type.

Parameters:

type - The type for which a dispatcher should be resolved.

classLoader - The class loader to resolve the proxied type from.

generate - true if a proxy class should be manually generated.

Returns:

An action for creating an appropriate dispatcher.

run

public T run()

Specified by:

run in interface PrivilegedAction<T>