10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #include <jni.h>
25 #include <stdio.h>
26
27 extern "C" {
28
29 /*
30 * A C function that takes a reference to java Object( a circular Linked list)
31 * and utilizes this reference to do a java method callback to determine the
32 * number of elements in the linked list
33 */
34 JNIEXPORT jint JNICALL
35 Java_gc_gctests_nativeGC01_nativeGC01_nativeMethod01
36 (JNIEnv *env, jobject obj, jobject linked_list) {
37 jclass cls, clss;
38 jmethodID mid, mid2;
39 int elementCount;
40
41 /* Before doing anything force a GC by
42 invoking a callback where System.gc() is called
43 */
44 cls = env->GetObjectClass(obj);
45 mid = env->GetMethodID(cls, "callbackGC", "()V");
46 if (mid == 0) {
47 printf("couldnt locate method callbackGC()");
48 return -1;
49 }
50 env->CallVoidMethod(obj,mid);
51
52 /* Now that a GC has been done, invoke the callback
53 that counts the number of elements in the
54 circular linked list
55 */
56
57 clss = env->GetObjectClass(linked_list);
58 mid2 = env->GetMethodID(clss, "getLength", "()I" );
59 if (mid2 == 0) {
60 printf("couldnt locate method getLength()");
61 return -1;
62 }
63 elementCount = env->CallIntMethod(linked_list, mid2);
64 return elementCount;
65 }
66
67 }
|
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #include <jni.h>
25 #include <stdio.h>
26
27 extern "C" {
28
29 /*
30 * A C function that takes a reference to java Object(a circular Linked list)
31 * and utilizes this reference to do a java method callback to determine the
32 * number of elements in the linked list
33 */
34 JNIEXPORT jint JNICALL
35 Java_gc_gctests_nativeGC01_nativeGC01_nativeMethod01
36 (JNIEnv *env, jobject obj, jobject linked_list) {
37 jclass cls, clss;
38 jmethodID mid, mid2;
39 int elementCount;
40
41 /* Before doing anything force a GC by
42 invoking a callback where System.gc() is called
43 */
44 cls = env->GetObjectClass(obj);
45 mid = env->GetMethodID(cls, "callbackGC", "()V");
46 if (mid == 0) {
47 printf("couldnt locate method callbackGC()");
48 return -1;
49 }
50 env->CallVoidMethod(obj,mid);
51
52 /* Now that a GC has been done, invoke the callback
53 that counts the number of elements in the
54 circular linked list
55 */
56
57 clss = env->GetObjectClass(linked_list);
58 mid2 = env->GetMethodID(clss, "getLength", "()I");
59 if (mid2 == 0) {
60 printf("couldnt locate method getLength()");
61 return -1;
62 }
63 elementCount = env->CallIntMethod(linked_list, mid2);
64 return elementCount;
65 }
66
67 }
|