| // Copyright 2009 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry5.ioc.services; |
| |
| import org.apache.tapestry5.ioc.MethodAdviceReceiver; |
| |
| /** |
| * An advisor that identifies methods which can be evaluated lazily and advises them. A method can be evaluated lazily |
| * if it returns an interface type and if it throws no checked exceptions. Lazy evaluation should be handled carefully, |
| * as if any of the parameters to a method are mutable, or the internal state of the invoked service changes, the lazily |
| * evaluated results may not match the immediately evaluated result. This effect is greatly exaggerated if the lazy |
| * return object is evaluated in a different thread than when it was generated. |
| * <p/> |
| * Another consideration is that exceptions that would occur immediately in the non-lazy case are also deferred, often |
| * losing much context in the process. |
| * <p/> |
| * Use laziness with great care. |
| * <p/> |
| * Use the {@link org.apache.tapestry5.ioc.annotations.NotLazy} annotation on methods that should not be advised. |
| * |
| * @since 5.1.0.0 |
| */ |
| public interface LazyAdvisor |
| { |
| void addLazyMethodInvocationAdvice(MethodAdviceReceiver methodAdviceReceiver); |
| |
| } |
