Package io.lettuce.core.internal

Class AbstractInvocationHandler

java.lang.Object

io.lettuce.core.internal.AbstractInvocationHandler

All Implemented Interfaces:

InvocationHandler

public abstract class AbstractInvocationHandler
extends Object
implements InvocationHandler

Abstract base class for invocation handlers.

Since:

4.2

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	AbstractInvocationHandler.MethodTranslator

Constructor Summary

Constructors

Constructor	Description
AbstractInvocationHandler()

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	By default delegates to Object.equals(java.lang.Object) so instances are only equal if they are identical.
protected abstract Object	handleInvocation(Object proxy, Method method, Object[] args)	invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[]) delegates to this method upon any method invocation on the proxy instance, except Object.equals(java.lang.Object), Object.hashCode() and Object.toString().
int	hashCode()	By default delegates to Object.hashCode().
Object	invoke(Object proxy, Method method, Object[] args)	proxy.hashCode() delegates to hashCode() proxy.toString() delegates to toString() proxy.equals(argument) returns true if: proxy and argument are of the same type and equals(java.lang.Object) returns true for the InvocationHandler of argument other method calls are dispatched to handleInvocation(java.lang.Object, java.lang.reflect.Method, java.lang.Object[]).
String	toString()	By default delegates to Object.toString().

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

AbstractInvocationHandler

public AbstractInvocationHandler()

Method Detail

invoke

public final Object invoke(Object proxy,
                           Method method,
                           Object[] args)
                    throws Throwable

• proxy.hashCode() delegates to hashCode()
• proxy.toString() delegates to toString()
• proxy.equals(argument) returns true if:
  • proxy and argument are of the same type
  • and equals(java.lang.Object) returns true for the InvocationHandler of argument
• other method calls are dispatched to handleInvocation(java.lang.Object, java.lang.reflect.Method, java.lang.Object[]).

Specified by:

invoke in interface InvocationHandler

Parameters:

proxy - the proxy instance that the method was invoked on

method - the Method instance corresponding to the interface method invoked on the proxy instance. The declaring class of the Method object will be the interface that the method was declared in, which may be a superinterface of the proxy interface that the proxy class inherits the method through.

args - an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, or null if interface method takes no arguments. Arguments of primitive types are wrapped in instances of the appropriate primitive wrapper class, such as java.lang.Integer or java.lang.Boolean.

Returns:

the invocation result value

Throws:

Throwable - the exception to throw from the method invocation on the proxy instance.

handleInvocation

protected abstract Object handleInvocation(Object proxy,
                                           Method method,
                                           Object[] args)
                                    throws Throwable

invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[]) delegates to this method upon any method invocation on the proxy instance, except Object.equals(java.lang.Object), Object.hashCode() and Object.toString(). The result will be returned as the proxied method's return value.

Unlike invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[]), args will never be null. When the method has no parameter, an empty array is passed in.

Parameters:

proxy - the proxy instance that the method was invoked on

method - the Method instance corresponding to the interface method invoked on the proxy instance. The declaring class of the Method object will be the interface that the method was declared in, which may be a superinterface of the proxy interface that the proxy class inherits the method through.

args - an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, or null if interface method takes no arguments. Arguments of primitive types are wrapped in instances of the appropriate primitive wrapper class, such as java.lang.Integer or java.lang.Boolean.

Returns:

the invocation result value

Throws:

Throwable - the exception to throw from the method invocation on the proxy instance.

equals

public boolean equals(Object obj)

By default delegates to Object.equals(java.lang.Object) so instances are only equal if they are identical. proxy.equals(argument) returns true if:

• proxy and argument are of the same type
• and this method returns true for the InvocationHandler of argument

Subclasses can override this method to provide custom equality.

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

hashCode

public int hashCode()

By default delegates to Object.hashCode(). The dynamic proxies' hashCode() will delegate to this method. Subclasses can override this method to provide custom equality.

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

toString

public String toString()

By default delegates to Object.toString(). The dynamic proxies' toString() will delegate to this method. Subclasses can override this method to provide custom string representation for the proxies.

Overrides:

toString in class Object

Returns:

a string representation of the object.