frameworks/base: Use WAL mode for selected databases. Others use default mode: DELETE. (fa489205) · Commits · e / os / android_frameworks_base

core/jni/android_database_SQLiteDatabase.cpp

+46 −14

Original line number	Diff line number	Diff line
		@@ -35,6 +35,7 @@
		#include <ctype.h>

		#include <stdio.h>
		#include <libgen.h>
		#include <sys/types.h>
		#include <sys/socket.h>
		#include <netinet/in.h>
		@@ -93,6 +94,26 @@ static void registerLoggingFunc(const char *path) {
		loggingFuncSet = true;
		}

		static int use_wal_mode (char const *path8)
		{
		char *temp = basename(path8);
		int i;
		const char *wal_dbs[] = {
		"database_test.db","contacts2.db","calendar.db",\
		"telephony.db","launcher.db","user_dict.db",\
		"downloads.db", "mmssms.db", "internal.db", \
		"EmailProvider.db","alarms.db","EmailProviderBody.db",\
		"btopp.db","picasa.db","webview.db",\
		"webviewCache.db","browser.db","quadrant.db", NULL};

		for (i = 0 ; wal_dbs[i]!= NULL ; i++) {
		if(strcmp(temp, wal_dbs[i]) == 0)
		return 1;
		}

		return 0;
		}

		/* public native void dbopen(String path, int flags, String locale); */
		static void dbopen(JNIEnv* env, jobject object, jstring pathString, jint flags)
		{
		@@ -123,16 +144,26 @@ static void dbopen(JNIEnv* env, jobject object, jstring pathString, jint flags)
		goto done;
		}

		// WAL is a new rollback method available in SQLite v3.7+. WAL speeds up writes to
		// SQLite databases. WAL cannot be used with Read Only databases or databases opened
		// in read only mode.

		// Check if DB can use WAL mode; Open in WAL mode for non-ReadOnly DBs
		if(!(flags & OPEN_READONLY) && (use_wal_mode(path8))) {
		// Configure databases to run in WAL mode.
		if(!(flags & OPEN_READONLY)) {
		err = sqlite3_exec(handle,"PRAGMA journal_mode = WAL;",
		NULL, NULL,&zErrMsg);
		if (SQLITE_OK != err) {
		LOGE("sqlite3_exec to set journal_mode = WAL failed\n");
		LOGE("sqlite3_exec - Failed to set WAL mode for [%s] \n", path8);
		err = sqlite3_exec(handle,"PRAGMA journal_mode = DELETE;",
		NULL, NULL,&zErrMsg);
		if(SQLITE_OK != err) {
		LOGE("sqlite3_exec - Failed to set DELETE mode for [%s] \n", path8);
		throw_sqlite3_exception(env, handle);
		goto done;
		}

		}
		else {
		// Set autocheckpoint = 100 pages
		err = sqlite3_wal_autocheckpoint(handle,
		100);
		@@ -142,6 +173,7 @@ static void dbopen(JNIEnv* env, jobject object, jstring pathString, jint flags)
		goto done;
		}
		}
		}

		// The soft heap limit prevents the page cache allocations from growing
		// beyond the given limit, no matter what the max page cache sizes are