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102 lines
2.5 KiB
102 lines
2.5 KiB
package com.gyf.csams.util
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import android.content.Context
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.MutableLiveData
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import androidx.room.*
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import kotlinx.serialization.Serializable
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/**
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* 登陆令牌
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*/
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@Entity
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@Serializable
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data class Token(
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@PrimaryKey val studentId: String,
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@ColumnInfo val token: String,
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@ColumnInfo val createTime: Long
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)
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/**
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* 令牌传输
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*
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* @property isValid
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* @property token
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*/
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@Serializable
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data class TokenResDto(val isValid: Boolean, val token: Token?)
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@Dao
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interface TokenDao {
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@Query("select * from token")
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suspend fun queryAll(): List<Token>
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@Insert(onConflict = OnConflictStrategy.REPLACE)
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suspend fun save(token: Token)
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@Delete
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suspend fun delete(user: Token)
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}
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class TokenManager private constructor(private var token: Token?) {
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companion object {
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@Volatile
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private var instance: TokenManager? = null
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fun getInstance(token: Token? = null) =
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instance ?: synchronized(this) {
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instance ?: TokenManager(token).also { instance = it }
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}
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}
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}
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@Database(entities = [Token::class], version = 1, exportSchema = false)
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abstract class AppDatabase : RoomDatabase() {
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abstract fun tokenDao(): TokenDao
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private val mIsDatabaseCreated = MutableLiveData<Boolean>()
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/**
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* Check whether the database already exists and expose it via [.getDatabaseCreated]
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*/
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private fun updateDatabaseCreated(context: Context) {
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if (context.getDatabasePath(DATABASE_NAME).exists()) {
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setDatabaseCreated()
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}
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}
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private fun setDatabaseCreated() {
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mIsDatabaseCreated.postValue(true)
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}
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val databaseCreated: LiveData<Boolean>
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get() = mIsDatabaseCreated
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companion object {
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private var sInstance: AppDatabase? = null
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const val DATABASE_NAME = "basic-sample-db"
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fun getInstance(context: Context): AppDatabase? {
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if (sInstance == null) {
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synchronized(AppDatabase::class.java) {
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if (sInstance == null) {
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sInstance =
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buildDatabase(context.applicationContext)
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sInstance!!.updateDatabaseCreated(context.applicationContext)
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}
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}
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}
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return sInstance
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}
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private fun buildDatabase(appContext: Context): AppDatabase {
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return Room.databaseBuilder(appContext, AppDatabase::class.java, DATABASE_NAME)
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.build()
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}
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}
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} |