android_database_SQLiteDebug.cpp revision 2a293b61cb0efbf24994d74ed980f58b820bb35a 
1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <JNIHelp.h>
18#include <jni.h>
19#include <utils/misc.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
24#include <cutils/mspace.h>
25#include <utils/Log.h>
26
27#include <sqlite3.h>
28
29namespace android {
30
31static jfieldID gMemoryUsedField;
32static jfieldID gPageCacheOverflowField;
33static jfieldID gLargestMemAllocField;
34
35
36#define USE_MSPACE 0
37
38static void getPagerStats(JNIEnv *env, jobject clazz, jobject statsObj)
39{
40    int memoryUsed;
41    int pageCacheOverflow;
42    int largestMemAlloc;
43    int unused;
44
45    sqlite3_status(SQLITE_STATUS_MEMORY_USED, &memoryUsed, &unused, 0);
46    sqlite3_status(SQLITE_STATUS_MALLOC_SIZE, &unused, &largestMemAlloc, 0);
47    sqlite3_status(SQLITE_STATUS_PAGECACHE_OVERFLOW, &pageCacheOverflow, &unused, 0);
48    env->SetIntField(statsObj, gMemoryUsedField, memoryUsed);
49    env->SetIntField(statsObj, gPageCacheOverflowField, pageCacheOverflow);
50    env->SetIntField(statsObj, gLargestMemAllocField, largestMemAlloc);
51}
52
53/*
54 * JNI registration.
55 */
56
57static JNINativeMethod gMethods[] =
58{
59    { "getPagerStats", "(Landroid/database/sqlite/SQLiteDebug$PagerStats;)V",
60            (void*) getPagerStats },
61};
62
63int register_android_database_SQLiteDebug(JNIEnv *env)
64{
65    jclass clazz;
66
67    clazz = env->FindClass("android/database/sqlite/SQLiteDebug$PagerStats");
68    if (clazz == NULL) {
69        ALOGE("Can't find android/database/sqlite/SQLiteDebug$PagerStats");
70        return -1;
71    }
72
73    gMemoryUsedField = env->GetFieldID(clazz, "memoryUsed", "I");
74    if (gMemoryUsedField == NULL) {
75        ALOGE("Can't find memoryUsed");
76        return -1;
77    }
78
79    gLargestMemAllocField = env->GetFieldID(clazz, "largestMemAlloc", "I");
80    if (gLargestMemAllocField == NULL) {
81        ALOGE("Can't find largestMemAlloc");
82        return -1;
83    }
84
85    gPageCacheOverflowField = env->GetFieldID(clazz, "pageCacheOverflow", "I");
86    if (gPageCacheOverflowField == NULL) {
87        ALOGE("Can't find pageCacheOverflow");
88        return -1;
89    }
90
91    return jniRegisterNativeMethods(env, "android/database/sqlite/SQLiteDebug",
92            gMethods, NELEM(gMethods));
93}
94
95} // namespace android
96