creating a room DB for storing conversations

app/src/main/kotlin/com/simplemobiletools/smsmessenger/databases/MessagesDatabase.kt

@@ -0,0 +1,30 @@
+package com.simplemobiletools.smsmessenger.databases
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import com.simplemobiletools.smsmessenger.interfaces.ConversationsDao
+import com.simplemobiletools.smsmessenger.models.Conversation
+
+@Database(entities = [(Conversation::class)], version = 1)
+abstract class MessagesDatabase : RoomDatabase() {
+
+    abstract fun ConversationsDao(): ConversationsDao
+
+    companion object {
+        private var db: MessagesDatabase? = null
+
+        fun getInstance(context: Context): MessagesDatabase {
+            if (db == null) {
+                synchronized(MessagesDatabase::class) {
+                    if (db == null) {
+                        db = Room.databaseBuilder(context.applicationContext, MessagesDatabase::class.java, "conversations.db")
+                            .build()
+                    }
+                }
+            }
+            return db!!
+        }
+    }
+}