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UsersDatabase.java
/* * Copyright (C) 2017 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. */ package com.example.android.observability.persistence; import android.arch.persistence.room.Database; import android.arch.persistence.room.Room; import android.arch.persistence.room.RoomDatabase; import android.content.Context; /** * The Room database that contains the Users table */ @Database(entities = {User.class}, version = 1) public abstract class UsersDatabase extends RoomDatabase { private static volatile UsersDatabase INSTANCE; public abstract UserDao userDao(); public static UsersDatabase getInstance(Context context) { if (INSTANCE == null) { synchronized (UsersDatabase.class) { if (INSTANCE == null) { INSTANCE = Room.databaseBuilder(context.getApplicationContext(), UsersDatabase.class, "Sample.db") .build(); } } } return INSTANCE; } }