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      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 <nativehelper/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 
     31 #include "core_jni_helpers.h"
     32 
     33 namespace android {
     34 
     35 static struct {
     36     jfieldID memoryUsed;
     37     jfieldID pageCacheOverflow;
     38     jfieldID largestMemAlloc;
     39 } gSQLiteDebugPagerStatsClassInfo;
     40 
     41 static void nativeGetPagerStats(JNIEnv *env, jobject clazz, jobject statsObj)
     42 {
     43     int memoryUsed;
     44     int pageCacheOverflow;
     45     int largestMemAlloc;
     46     int unused;
     47 
     48     sqlite3_status(SQLITE_STATUS_MEMORY_USED, &memoryUsed, &unused, 0);
     49     sqlite3_status(SQLITE_STATUS_MALLOC_SIZE, &unused, &largestMemAlloc, 0);
     50     sqlite3_status(SQLITE_STATUS_PAGECACHE_OVERFLOW, &pageCacheOverflow, &unused, 0);
     51     env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.memoryUsed, memoryUsed);
     52     env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.pageCacheOverflow,
     53             pageCacheOverflow);
     54     env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.largestMemAlloc, largestMemAlloc);
     55 }
     56 
     57 /*
     58  * JNI registration.
     59  */
     60 
     61 static const JNINativeMethod gMethods[] =
     62 {
     63     { "nativeGetPagerStats", "(Landroid/database/sqlite/SQLiteDebug$PagerStats;)V",
     64             (void*) nativeGetPagerStats },
     65 };
     66 
     67 int register_android_database_SQLiteDebug(JNIEnv *env)
     68 {
     69     jclass clazz = FindClassOrDie(env, "android/database/sqlite/SQLiteDebug$PagerStats");
     70 
     71     gSQLiteDebugPagerStatsClassInfo.memoryUsed = GetFieldIDOrDie(env, clazz, "memoryUsed", "I");
     72     gSQLiteDebugPagerStatsClassInfo.largestMemAlloc = GetFieldIDOrDie(env, clazz,
     73             "largestMemAlloc", "I");
     74     gSQLiteDebugPagerStatsClassInfo.pageCacheOverflow = GetFieldIDOrDie(env, clazz,
     75             "pageCacheOverflow", "I");
     76 
     77     return RegisterMethodsOrDie(env, "android/database/sqlite/SQLiteDebug",
     78             gMethods, NELEM(gMethods));
     79 }
     80 
     81 } // namespace android
     82