https://openjdk.java.net/ 
/*
 * Copyright (c) 2003, 2013, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.lang.management;


The management interface for the compilation system of
the Java virtual machine.

 A Java virtual machine has a single instance of the implementation
class of this interface.  This instance implementing this interface is
an MXBean that can be obtained by calling the ManagementFactory.getCompilationMXBean method or from the 
platform MBeanServer method. 
The ObjectName for uniquely identifying the MXBean for the compilation system within an MBeanServer is: 
 
        java.lang:type=Compilation 
 It can be obtained by calling the PlatformManagedObject.getObjectName method. 
Author: Mandy Chung
See Also:
Since:  1.5
/**
 * The management interface for the compilation system of
 * the Java virtual machine.
 *
 * <p> A Java virtual machine has a single instance of the implementation
 * class of this interface.  This instance implementing this interface is
 * an <a href="ManagementFactory.html#MXBean">MXBean</a>
 * that can be obtained by calling
 * the {@link ManagementFactory#getCompilationMXBean} method or
 * from the {@link ManagementFactory#getPlatformMBeanServer
 * platform MBeanServer} method.
 *
 * <p>The {@code ObjectName} for uniquely identifying the MXBean for
 * the compilation system within an MBeanServer is:
 * <blockquote>
 *  {@link ManagementFactory#COMPILATION_MXBEAN_NAME
 *         java.lang:type=Compilation}
 * </blockquote>
 *
 * It can be obtained by calling the
 * {@link PlatformManagedObject#getObjectName} method.
 *
 * @see ManagementFactory#getPlatformMXBeans(Class)
 * @see <a href="../../../javax/management/package-summary.html">
 *      JMX Specification.</a>
 * @see <a href="package-summary.html#examples">
 *      Ways to Access MXBeans</a>
 *
 * @author  Mandy Chung
 * @since   1.5
 */
public interface CompilationMXBean extends PlatformManagedObject {
    
Returns the name of the Just-in-time (JIT) compiler.

Returns:the name of the JIT compiler.
/**
     * Returns the name of the Just-in-time (JIT) compiler.
     *
     * @return the name of the JIT compiler.
     */
    public java.lang.String    getName();

    
Tests if the Java virtual machine supports the monitoring of
compilation time.

Returns:true if the monitoring of compilation time is supported; false otherwise.
/**
     * Tests if the Java virtual machine supports the monitoring of
     * compilation time.
     *
     * @return {@code true} if the monitoring of compilation time is
     * supported; {@code false} otherwise.
     */
    public boolean isCompilationTimeMonitoringSupported();

    
Returns the approximate accumulated elapsed time (in milliseconds)
spent in compilation.
If multiple threads are used for compilation, this value is
summation of the approximate time that each thread spent in compilation.

This method is optionally supported by the platform. A Java virtual machine implementation may not support the compilation time monitoring. The isCompilationTimeMonitoringSupported method can be used to determine if the Java virtual machine supports this operation. 
 This value does not indicate the level of performance of
the Java virtual machine and is not intended for performance comparisons
of different virtual machine implementations.
The implementations may have different definitions and different
measurements of the compilation time.

Throws:
Returns:Compilation time in milliseconds
/**
     * Returns the approximate accumulated elapsed time (in milliseconds)
     * spent in compilation.
     * If multiple threads are used for compilation, this value is
     * summation of the approximate time that each thread spent in compilation.
     *
     * <p>This method is optionally supported by the platform.
     * A Java virtual machine implementation may not support the compilation
     * time monitoring. The {@link #isCompilationTimeMonitoringSupported}
     * method can be used to determine if the Java virtual machine
     * supports this operation.
     *
     * <p> This value does not indicate the level of performance of
     * the Java virtual machine and is not intended for performance comparisons
     * of different virtual machine implementations.
     * The implementations may have different definitions and different
     * measurements of the compilation time.
     *
     * @return Compilation time in milliseconds
     * @throws java.lang.UnsupportedOperationException if the Java
     * virtual machine does not support
     * this operation.
     *
     */
    public long                getTotalCompilationTime();
}