11/*
2- * Copyright (c) 2002, 2021 , Oracle and/or its affiliates. All rights reserved.
2+ * Copyright (c) 2002, 2022 , Oracle and/or its affiliates. All rights reserved.
33 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
44 *
55 * This code is free software; you can redistribute it and/or modify it
@@ -56,9 +56,6 @@ public final class Perf {
5656
5757 private static Perf instance ;
5858
59- private static final int PERF_MODE_RO = 0 ;
60- private static final int PERF_MODE_RW = 1 ;
61-
6259 private Perf () { } // prevent instantiation
6360
6461 /**
@@ -171,50 +168,28 @@ public static Perf getPerf()
171168 * for the Java virtual machine running this method, then the returned
172169 * <code>ByteBuffer</code> object will always be coherent and dynamically
173170 * changing.
174- * <p>
175- * The attach mode specifies the access permissions requested for the
176- * instrumentation buffer of the target virtual machine. The permitted
177- * access permissions are:
178- * <ul>
179- * <li>"r" - Read only access. This Java virtual machine has only
180- * read access to the instrumentation buffer for the target Java
181- * virtual machine.
182- * <li>"rw" - Read/Write access. This Java virtual machine has read and
183- * write access to the instrumentation buffer for the target Java virtual
184- * machine. This mode is currently not supported and is reserved for
185- * future enhancements.
186- * </ul>
187171 *
188172 * @param lvmid an integer that uniquely identifies the
189173 * target local Java virtual machine.
190- * @param mode a string indicating the attach mode.
191174 * @return ByteBuffer a direct allocated byte buffer
192- * @throws IllegalArgumentException The lvmid or mode was invalid.
175+ * @throws IllegalArgumentException The lvmid was invalid.
193176 * @throws IOException An I/O error occurred while trying to acquire
194177 * the instrumentation buffer.
195178 * @throws OutOfMemoryError The instrumentation buffer could not be mapped
196179 * into the virtual machine's address space.
197180 * @see java.nio.ByteBuffer
198181 */
199- public ByteBuffer attach (int lvmid , String mode )
182+ public ByteBuffer attach (int lvmid )
200183 throws IllegalArgumentException , IOException
201184 {
202- if (mode .compareTo ("r" ) == 0 ) {
203- return attachImpl (null , lvmid , PERF_MODE_RO );
204- }
205- else if (mode .compareTo ("rw" ) == 0 ) {
206- return attachImpl (null , lvmid , PERF_MODE_RW );
207- }
208- else {
209- throw new IllegalArgumentException ("unknown mode" );
210- }
185+ return attachImpl (null , lvmid );
211186 }
212187
213188 /**
214189 * Attach to the instrumentation buffer for the specified Java virtual
215190 * machine owned by the given user.
216191 * <p>
217- * This method behaves just as the <code>attach(int lvmid, String mode )
192+ * This method behaves just as the <code>attach(int lvmid)
218193 * </code> method, except that it only searches for Java virtual machines
219194 * owned by the specified user.
220195 *
@@ -223,27 +198,18 @@ else if (mode.compareTo("rw") == 0) {
223198 * virtual machine.
224199 * @param lvmid an integer that uniquely identifies the
225200 * target local Java virtual machine.
226- * @param mode a string indicating the attach mode.
227201 * @return ByteBuffer a direct allocated byte buffer
228- * @throws IllegalArgumentException The lvmid or mode was invalid.
202+ * @throws IllegalArgumentException The lvmid was invalid.
229203 * @throws IOException An I/O error occurred while trying to acquire
230204 * the instrumentation buffer.
231205 * @throws OutOfMemoryError The instrumentation buffer could not be mapped
232206 * into the virtual machine's address space.
233207 * @see java.nio.ByteBuffer
234208 */
235- public ByteBuffer attach (String user , int lvmid , String mode )
209+ public ByteBuffer attach (String user , int lvmid )
236210 throws IllegalArgumentException , IOException
237211 {
238- if (mode .compareTo ("r" ) == 0 ) {
239- return attachImpl (user , lvmid , PERF_MODE_RO );
240- }
241- else if (mode .compareTo ("rw" ) == 0 ) {
242- return attachImpl (user , lvmid , PERF_MODE_RW );
243- }
244- else {
245- throw new IllegalArgumentException ("unknown mode" );
246- }
212+ return attachImpl (user , lvmid );
247213 }
248214
249215 /**
@@ -259,18 +225,17 @@ else if (mode.compareTo("rw") == 0) {
259225 * virtual machine.
260226 * @param lvmid an integer that uniquely identifies the
261227 * target local Java virtual machine.
262- * @param mode a string indicating the attach mode.
263228 * @return ByteBuffer a direct allocated byte buffer
264- * @throws IllegalArgumentException The lvmid or mode was invalid.
229+ * @throws IllegalArgumentException The lvmid was invalid.
265230 * @throws IOException An I/O error occurred while trying to acquire
266231 * the instrumentation buffer.
267232 * @throws OutOfMemoryError The instrumentation buffer could not be mapped
268233 * into the virtual machine's address space.
269234 */
270- private ByteBuffer attachImpl (String user , int lvmid , int mode )
235+ private ByteBuffer attachImpl (String user , int lvmid )
271236 throws IllegalArgumentException , IOException
272237 {
273- final ByteBuffer b = attach (user , lvmid , mode );
238+ final ByteBuffer b = attach0 (user , lvmid );
274239
275240 if (lvmid == 0 ) {
276241 // The native instrumentation buffer for this Java virtual
@@ -326,15 +291,14 @@ public void run() {
326291 * virtual machine.
327292 * @param lvmid an integer that uniquely identifies the
328293 * target local Java virtual machine.
329- * @param mode a string indicating the attach mode.
330294 * @return ByteBuffer a direct allocated byte buffer
331- * @throws IllegalArgumentException The lvmid or mode was invalid.
295+ * @throws IllegalArgumentException The lvmid was invalid.
332296 * @throws IOException An I/O error occurred while trying to acquire
333297 * the instrumentation buffer.
334298 * @throws OutOfMemoryError The instrumentation buffer could not be mapped
335299 * into the virtual machine's address space.
336300 */
337- private native ByteBuffer attach (String user , int lvmid , int mode )
301+ private native ByteBuffer attach0 (String user , int lvmid )
338302 throws IllegalArgumentException , IOException ;
339303
340304 /**
0 commit comments