net.bytebuddy.utility.dispatcher

Class JavaDispatcher<T>

java.lang.Object

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

Type Parameters:

T - The resolved type.

All Implemented Interfaces:

PrivilegedAction<T>

@HashCodeAndEqualsPlugin.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 and 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 and Description
static 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 and Description
protected	JavaDispatcher(Class<T> proxy, ClassLoader classLoader, boolean generate) Creates a new dispatcher.

Method Summary

Modifier and Type	Method and 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.
protected 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 java.lang.Object

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

Field Detail

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 Detail

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 Detail

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

protected 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>