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.
sqliteLogCallback(void * data,int err,const char * msg)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.
sqliteInitialize()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
nativeReleaseMemory(JNIEnv * env,jclass clazz)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
register_android_database_SQLiteGlobal(JNIEnv * env)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