MultiClass.java

/*
 * Copyright (c) 2008, 2024, Jaroslav Bachorik <j.bachorik@btrace.io>.
 * 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
 *
 *     https://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.
 */


import io.btrace.core.annotations.BTrace;
import io.btrace.core.annotations.OnMethod;
import io.btrace.core.annotations.ProbeClassName;

import static io.btrace.BTrace.println;

/**
 * This BTrace class demonstrates that we can
 * probe into multiple classes and methods by a
 * single probe specification using regular
 * expressions for class and/or method names as
 * given below. In the example, we put probe into
 * all readXXX methods of all InputStream classes.
 */
@BTrace
public class MultiClass {
    @OnMethod(
            clazz = "/java\\.io\\..*Input.*/",
            method = "/read.*/"
    )
    public static void onread(@ProbeClassName String pcn) {
        println("read on " + pcn);
    }
}