io.fabric8.apmagent.ApmMethodVisitor.java Source code

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Here is the source code for io.fabric8.apmagent.ApmMethodVisitor.java

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/*
 * Copyright 2005-2014 Red Hat, Inc.
 * Red Hat 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 io.fabric8.apmagent;

import org.objectweb.asm.MethodVisitor;

import static org.objectweb.asm.Opcodes.*;

public class ApmMethodVisitor extends MethodVisitor {
    private final String fullMethodName;

    public ApmMethodVisitor(MethodVisitor mv, String owner, String name, String desc) {
        super(ASM5, mv);

        this.fullMethodName = new String(owner + "@" + name + desc).replace('/', '.');
    }

    @Override
    public void visitCode() {
        super.visitCode();
        super.visitLdcInsn(fullMethodName);
        super.visitMethodInsn(INVOKESTATIC, "io/fabric8/apmagent/metrics/ApmAgentContext", "enterMethod",
                "(Ljava/lang/String;)V", false);
    }

    @Override
    public void visitInsn(int opcode) {
        if ((opcode >= IRETURN && opcode <= RETURN) || opcode == ATHROW) {
            super.visitLdcInsn(fullMethodName);
            super.visitMethodInsn(INVOKESTATIC, "io/fabric8/apmagent/metrics/ApmAgentContext", "exitMethod",
                    "(Ljava/lang/String;)V", false);
        }
        super.visitInsn(opcode);
    }
}