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 <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 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