# SideEffectOf.java

    /*
     * Copyright 2008 Niclas Hedhman. All rights Reserved.
     *
     * 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.qi4j.api.sideeffect;

    import org.qi4j.api.sideeffect.internal.SideEffectFor;

    /**
     * Base class for SideEffects. It introduces a typed "next" pointer
     * that SideEffects can use to get the result of the original invocation.
     * <p>
     * Generic SideEffects should subclass {@link GenericSideEffect} instead.
     * </p>
     * <p>
     * SideEffects implementations must be thread-safe in their implementation,
     * as multiple threads may share instances.
     * </p>
     */
    public abstract class SideEffectOf<T>
    {
        final
        @SideEffectFor
        protected T result = null;
    }