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BTrace: A safe, dynamic tracing tool for the Java platform
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/*
 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the Classpath exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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import org.openjdk.btrace.core.annotations.BTrace;
import org.openjdk.btrace.core.annotations.Duration;
import org.openjdk.btrace.core.annotations.Kind;
import org.openjdk.btrace.core.annotations.Location;
import org.openjdk.btrace.core.annotations.OnMethod;
import org.openjdk.btrace.core.annotations.ProbeClassName;
import org.openjdk.btrace.core.annotations.ProbeMethodName;

import static org.openjdk.btrace.core.BTraceUtils.*;

/**
 * A simple BTrace program that prints a class name
 * and method name whenever a webservice is called and
 * also prints time taken by service method. WebService
 * entry points are annotated javax.jws.WebService and
 * javax.jws.WebMethod. We insert tracing actions into
 * every class and method annotated by these annotations.
 * This way we don't need to know actual webservice
 * implementor class name.
 */
@BTrace
public class WebServiceTracker {
    @OnMethod(
            clazz = "@javax.jws.WebService",
            method = "@javax.jws.WebMethod"
    )
    public static void onWebserviceEntry(@ProbeClassName String pcn, @ProbeMethodName String pmn) {
        print("entering webservice ");
        println(Strings.strcat(Strings.strcat(pcn, "."), pmn));
    }

    @OnMethod(
            clazz = "@javax.jws.WebService",
            method = "@javax.jws.WebMethod",
            location = @Location(Kind.RETURN)
    )
    public static void onWebserviceReturn(@ProbeClassName String pcn, @ProbeMethodName String pmn, @Duration long d) {
        print("leaving web service ");
        println(Strings.strcat(Strings.strcat(pcn, "."), pmn));
        println(Strings.strcat("Time taken (msec) ", Strings.str(d / 1000)));
        println("==========================");
    }

}