modules/core/src/main/java/org/apache/ignite/internal/GridProxyListener.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.ignite.internal;

import java.util.EventListener;

/**
 * Interception listener is notified about method apply. For each intercepted method
 * apply the listener will be called twice - before and after the apply.
 * <p>
 * Method {@link #beforeCall(Class, String, Object[])} is called right before the
 * traceable method and the second apply {@link #afterCall(Class, String, Object[], Object, Throwable)}
 * is made to get invocation result and exception, if there was one.
 */
public interface GridProxyListener extends EventListener {
    /**
     * Method is called right before the traced method.
     *
     * @param cls Callee class.
     * @param mtdName Callee method name.
     * @param args Callee method parameters.
     */
    public void beforeCall(Class<?> cls, String mtdName, Object[] args);

    /**
     * Method is called right after the traced method.
     *
     * @param cls Callee class.
     * @param mtdName Callee method name.
     * @param args Callee method parameters.
     * @param res Call result. Might be {@code null} if apply
     *      returned {@code null} or if exception happened.
     * @param e Exception thrown by given method apply, if any. Can be {@code null}.
     */
    public void afterCall(Class<?> cls, String mtdName, Object[] args, Object res, Throwable e);
}