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package com.sun.management;

import java.util.Map;

/**

 * Platform-specific management interface for the thread system

 * of the Java virtual machine.

 * <p>

 * This platform extension is only available to a thread

 * implementation that supports this extension.

 *

 * @author  Paul Hohensee

 * @since   6u25

 */

public interface ThreadMXBean extends java.lang.management.ThreadMXBean {

    /**

     * Returns the total CPU time for each thread whose ID is

     * in the input array {@code ids} in nanoseconds.

     * The returned values are of nanoseconds precision but

     * not necessarily nanoseconds accuracy.

     * <p>

     * This method is equivalent to calling the

     * {@link ThreadMXBean#getThreadCpuTime(long)}

     * method for each thread ID in the input array {@code ids} and setting the

     * returned value in the corresponding element of the returned array.

     *

     * @param ids an array of thread IDs.

     * @return an array of long values, each of which is the amount of CPU

     * time the thread whose ID is in the corresponding element of the input

     * array of IDs has used,

     * if the thread of a specified ID exists, the thread is alive,

     * and CPU time measurement is enabled;

     * {@code -1} otherwise.

     *

     * @throws NullPointerException if {@code ids} is {@code null}

     * @throws IllegalArgumentException if any element in the input array

     *         {@code ids} is {@code <=} {@code 0}.

     *         virtual machine implementation does not support CPU time

     *         measurement.

     *

     * @see ThreadMXBean#getThreadCpuTime(long)

     * @see #getThreadUserTime

     * @see ThreadMXBean#isThreadCpuTimeSupported

     * @see ThreadMXBean#isThreadCpuTimeEnabled

     * @see ThreadMXBean#setThreadCpuTimeEnabled

     */

    public long[] getThreadCpuTime(long[] ids);

    /**

     * Returns the CPU time that each thread whose ID is in the input array

     * {@code ids} has executed in user mode in nanoseconds.

     * The returned values are of nanoseconds precision but

     * not necessarily nanoseconds accuracy.

     * <p>

     * This method is equivalent to calling the

     * {@link ThreadMXBean#getThreadUserTime(long)}

     * method for each thread ID in the input array {@code ids} and setting the

     * returned value in the corresponding element of the returned array.

     *

     * @param ids an array of thread IDs.

     * @return an array of long values, each of which is the amount of user

     * mode CPU time the thread whose ID is in the corresponding element of

     * the input array of IDs has used,

     * if the thread of a specified ID exists, the thread is alive,

     * and CPU time measurement is enabled;

     * {@code -1} otherwise.

     *

     * @throws NullPointerException if {@code ids} is {@code null}

     * @throws IllegalArgumentException if any element in the input array

     *         {@code ids} is {@code <=} {@code 0}.

     *         virtual machine implementation does not support CPU time

     *         measurement.

     *

     * @see ThreadMXBean#getThreadUserTime(long)

     * @see #getThreadCpuTime

     * @see ThreadMXBean#isThreadCpuTimeSupported

     * @see ThreadMXBean#isThreadCpuTimeEnabled

     * @see ThreadMXBean#setThreadCpuTimeEnabled

     */

    public long[] getThreadUserTime(long[] ids);

    /**

     * Returns an approximation of the total amount of memory, in bytes,

     * The returned value is an approximation because some Java virtual machine

     * implementations may use object allocation mechanisms that result in a

     * delay between the time an object is allocated and the time its size is

     * recorded.

     * <p>

     * this method returns {@code -1}. If thread memory allocation measurement

     * is disabled, this method returns {@code -1}.

     * A thread is alive if it has been started and has not yet died.

     * <p>

     * If thread memory allocation measurement is enabled after the thread has

     * started, the Java virtual machine implementation may choose any time up

     * to and including the time that the capability is enabled as the point

     * where thread memory allocation measurement starts.

     *

     * @param id the thread ID of a thread

     * @return an approximation of the total memory allocated, in bytes, in

     * and thread memory allocation measurement is enabled;

     * {@code -1} otherwise.

     *

     * @throws IllegalArgumentException if {@code id} {@code <=} {@code 0}.

     *         machine implementation does not support thread memory allocation

     *         measurement.

     *

     * @see #isThreadAllocatedMemorySupported

     * @see #isThreadAllocatedMemoryEnabled

     * @see #setThreadAllocatedMemoryEnabled

     */

    public long getThreadAllocatedBytes(long id);

    /**

     * Returns an approximation of the total amount of memory, in bytes,

     * allocated in heap memory for each thread whose ID is in the input

     * array {@code ids}.

     * The returned values are approximations because some Java virtual machine

     * implementations may use object allocation mechanisms that result in a

     * delay between the time an object is allocated and the time its size is

     * recorded.

     * <p>

     * This method is equivalent to calling the

     * {@link #getThreadAllocatedBytes(long)}

     * method for each thread ID in the input array {@code ids} and setting the

     * returned value in the corresponding element of the returned array.

     *

     * @param ids an array of thread IDs.

     * @return an array of long values, each of which is an approximation of

     * the total memory allocated, in bytes, in heap memory for the thread

     * whose ID is in the corresponding element of the input array of IDs.

     *

     * @throws NullPointerException if {@code ids} is {@code null}

     * @throws IllegalArgumentException if any element in the input array

     *         {@code ids} is {@code <=} {@code 0}.

     *         machine implementation does not support thread memory allocation

     *         measurement.

     *

     * @see #getThreadAllocatedBytes(long)

     * @see #isThreadAllocatedMemorySupported

     * @see #isThreadAllocatedMemoryEnabled

     * @see #setThreadAllocatedMemoryEnabled

     */

    public long[] getThreadAllocatedBytes(long[] ids);

    /**

     * Tests if the Java virtual machine implementation supports thread memory

     * allocation measurement.

     *

     * @return

     *   {@code true}

     *     if the Java virtual machine implementation supports thread memory

     *     allocation measurement;

     *   {@code false} otherwise.

     */

    public boolean isThreadAllocatedMemorySupported();

    /**

     * Tests if thread memory allocation measurement is enabled.

     *

     * @return {@code true} if thread memory allocation measurement is enabled;

     *         {@code false} otherwise.

     *

     *         machine does not support thread memory allocation measurement.

     *

     * @see #isThreadAllocatedMemorySupported

     */

    public boolean isThreadAllocatedMemoryEnabled();

    /**

     * Enables or disables thread memory allocation measurement.  The default

     * is platform dependent.

     *

     * @param enable {@code true} to enable;

     *               {@code false} to disable.

     *

     *         machine does not support thread memory allocation measurement.

     *

     *         exists and the caller does not have

     *         ManagementPermission("control").

     *

     * @see #isThreadAllocatedMemorySupported

     */

    public void setThreadAllocatedMemoryEnabled(boolean enable);

}