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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "SQLiteGlobal"
#include <jni.h>
#include <JNIHelp.h>
#include <android_runtime/AndroidRuntime.h>
#include <sqlite3.h>
#include <sqlite3_android.h>
#include "android_database_SQLiteCommon.h"
#include "android_util_Log.h"
namespace android {
// Limit heap to 8MB for now. This is 4 times the maximum cursor window
// size, as has been used by the original code in SQLiteDatabase for
// a long time.
static const int SOFT_HEAP_LIMIT = 8 * 1024 * 1024;
// Called each time a message is logged.
static void sqliteLogCallback(void* data, int iErrCode, const char* zMsg) {
bool verboseLog = !!data;
if (iErrCode == 0 || iErrCode == SQLITE_CONSTRAINT || iErrCode == SQLITE_SCHEMA) {
if (verboseLog) {
ALOGV(LOG_VERBOSE, SQLITE_LOG_TAG, "(%d) %s\n", iErrCode, zMsg);
}
} else {
ALOG(LOG_ERROR, SQLITE_LOG_TAG, "(%d) %s\n", iErrCode, zMsg);
}
}
// Sets the global SQLite configuration.
// This must be called before any other SQLite functions are called.
static void sqliteInitialize() {
// Enable multi-threaded mode. In this mode, SQLite is safe to use by multiple
// threads as long as no two threads use the same database connection at the same
// time (which we guarantee in the SQLite database wrappers).
sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
// Redirect SQLite log messages to the Android log.
bool verboseLog = android_util_Log_isVerboseLogEnabled(SQLITE_LOG_TAG);
sqlite3_config(SQLITE_CONFIG_LOG, &sqliteLogCallback, verboseLog ? (void*)1 : NULL);
// The soft heap limit prevents the page cache allocations from growing
// beyond the given limit, no matter what the max page cache sizes are
// set to. The limit does not, as of 3.5.0, affect any other allocations.
sqlite3_soft_heap_limit(SOFT_HEAP_LIMIT);
// Initialize SQLite.
sqlite3_initialize();
}
static jint nativeReleaseMemory(JNIEnv* env, jclass clazz) {
return sqlite3_release_memory(SOFT_HEAP_LIMIT);
}
static JNINativeMethod sMethods[] =
{
/* name, signature, funcPtr */
{ "nativeReleaseMemory", "()I",
(void*)nativeReleaseMemory },
};
int register_android_database_SQLiteGlobal(JNIEnv *env)
{
sqliteInitialize();
return AndroidRuntime::registerNativeMethods(env, "android/database/sqlite/SQLiteGlobal",
sMethods, NELEM(sMethods));
}
} // namespace android
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