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      1 /*
      2  * Copyright (C) 2011 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 "SQLiteGlobal"
     18 
     19 #include <jni.h>
     20 #include <nativehelper/JNIHelp.h>
     21 #include "core_jni_helpers.h"
     22 
     23 #include <sqlite3.h>
     24 #include <sqlite3_android.h>
     25 
     26 #include "android_database_SQLiteCommon.h"
     27 #include "android_util_Log.h"
     28 
     29 namespace android {
     30 
     31 // Limit heap to 8MB for now.  This is 4 times the maximum cursor window
     32 // size, as has been used by the original code in SQLiteDatabase for
     33 // a long time.
     34 static const int SOFT_HEAP_LIMIT = 8 * 1024 * 1024;
     35 
     36 
     37 // Called each time a message is logged.
     38 static void sqliteLogCallback(void* data, int err, const char* msg) {
     39     bool verboseLog = !!data;
     40     int errType = err & 255;
     41     if (errType == 0 || errType == SQLITE_CONSTRAINT || errType == SQLITE_SCHEMA
     42             || errType == SQLITE_NOTICE || err == SQLITE_WARNING_AUTOINDEX) {
     43         if (verboseLog) {
     44             ALOG(LOG_VERBOSE, SQLITE_LOG_TAG, "(%d) %s\n", err, msg);
     45         }
     46     } else if (errType == SQLITE_WARNING) {
     47         ALOG(LOG_WARN, SQLITE_LOG_TAG, "(%d) %s\n", err, msg);
     48     } else {
     49         ALOG(LOG_ERROR, SQLITE_LOG_TAG, "(%d) %s\n", err, msg);
     50     }
     51 }
     52 
     53 // Sets the global SQLite configuration.
     54 // This must be called before any other SQLite functions are called.
     55 static void sqliteInitialize() {
     56     // Enable multi-threaded mode.  In this mode, SQLite is safe to use by multiple
     57     // threads as long as no two threads use the same database connection at the same
     58     // time (which we guarantee in the SQLite database wrappers).
     59     sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
     60 
     61     // Redirect SQLite log messages to the Android log.
     62     bool verboseLog = android_util_Log_isVerboseLogEnabled(SQLITE_LOG_TAG);
     63     sqlite3_config(SQLITE_CONFIG_LOG, &sqliteLogCallback, verboseLog ? (void*)1 : NULL);
     64 
     65     // The soft heap limit prevents the page cache allocations from growing
     66     // beyond the given limit, no matter what the max page cache sizes are
     67     // set to. The limit does not, as of 3.5.0, affect any other allocations.
     68     sqlite3_soft_heap_limit(SOFT_HEAP_LIMIT);
     69 
     70     // Initialize SQLite.
     71     sqlite3_initialize();
     72 }
     73 
     74 static jint nativeReleaseMemory(JNIEnv* env, jclass clazz) {
     75     return sqlite3_release_memory(SOFT_HEAP_LIMIT);
     76 }
     77 
     78 static const JNINativeMethod sMethods[] =
     79 {
     80     /* name, signature, funcPtr */
     81     { "nativeReleaseMemory", "()I", (void*)nativeReleaseMemory },
     82 };
     83 
     84 int register_android_database_SQLiteGlobal(JNIEnv *env)
     85 {
     86     sqliteInitialize();
     87 
     88     return RegisterMethodsOrDie(env, "android/database/sqlite/SQLiteGlobal",
     89             sMethods, NELEM(sMethods));
     90 }
     91 
     92 } // namespace android
     93