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#define LOG_TAG "SQLiteDebug"
18
19#include <jni.h>
20#include <JNIHelp.h>
21#include <android_runtime/AndroidRuntime.h>
22
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <unistd.h>
27#include <utils/Log.h>
28
29#include <sqlite3.h>
30
31namespace android {
32
33static struct {
34    jfieldID memoryUsed;
35    jfieldID pageCacheOverflow;
36    jfieldID largestMemAlloc;
37} gSQLiteDebugPagerStatsClassInfo;
38
39static void nativeGetPagerStats(JNIEnv *env, jobject clazz, jobject statsObj)
40{
41    int memoryUsed;
42    int pageCacheOverflow;
43    int largestMemAlloc;
44    int unused;
45
46    sqlite3_status(SQLITE_STATUS_MEMORY_USED, &memoryUsed, &unused, 0);
47    sqlite3_status(SQLITE_STATUS_MALLOC_SIZE, &unused, &largestMemAlloc, 0);
48    sqlite3_status(SQLITE_STATUS_PAGECACHE_OVERFLOW, &pageCacheOverflow, &unused, 0);
49    env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.memoryUsed, memoryUsed);
50    env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.pageCacheOverflow,
51            pageCacheOverflow);
52    env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.largestMemAlloc, largestMemAlloc);
53}
54
55/*
56 * JNI registration.
57 */
58
59static JNINativeMethod gMethods[] =
60{
61    { "nativeGetPagerStats", "(Landroid/database/sqlite/SQLiteDebug$PagerStats;)V",
62            (void*) nativeGetPagerStats },
63};
64
65#define FIND_CLASS(var, className) \
66        var = env->FindClass(className); \
67        LOG_FATAL_IF(! var, "Unable to find class " className);
68
69#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
70        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
71        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
72
73int register_android_database_SQLiteDebug(JNIEnv *env)
74{
75    jclass clazz;
76    FIND_CLASS(clazz, "android/database/sqlite/SQLiteDebug$PagerStats");
77
78    GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.memoryUsed, clazz,
79            "memoryUsed", "I");
80    GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.largestMemAlloc, clazz,
81            "largestMemAlloc", "I");
82    GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.pageCacheOverflow, clazz,
83            "pageCacheOverflow", "I");
84
85    return AndroidRuntime::registerNativeMethods(env, "android/database/sqlite/SQLiteDebug",
86            gMethods, NELEM(gMethods));
87}
88
89} // namespace android
90