1 files changed, 86 insertions, 0 deletions
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/db/CacheDb.kt b/app/src/main/kotlin/com/pitchedapps/frost/db/CacheDb.kt
new file mode 100644
index 00000000..f0dacdc7
--- /dev/null
+++ b/app/src/main/kotlin/com/pitchedapps/frost/db/CacheDb.kt
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2018 Allan Wang
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.pitchedapps.frost.db
+
+import android.os.Parcelable
+import androidx.room.Dao
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import com.pitchedapps.frost.utils.L
+import kotlinx.android.parcel.Parcelize
+
+/**
+ * Created by Allan Wang on 2017-05-30.
+ */
+
+/**
+ * Generic cache to store serialized content
+ */
+@Entity(
+    tableName = "frost_cache",
+    primaryKeys = ["id", "type"],
+    foreignKeys = [ForeignKey(
+        entity = CookieEntity::class,
+        parentColumns = ["cookie_id"],
+        childColumns = ["id"],
+        onDelete = ForeignKey.CASCADE
+    )]
+)
+@Parcelize
+data class CacheEntity(
+    val id: Long,
+    val type: String,
+    val lastUpdated: Long,
+    val contents: String
+) : Parcelable
+
+@Dao
+interface CacheDao {
+
+    @Query("SELECT * FROM frost_cache WHERE id = :id AND type = :type")
+    fun _select(id: Long, type: String): CacheEntity?
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    fun _insertCache(cache: CacheEntity)
+
+    @Query("DELETE FROM frost_cache WHERE id = :id AND type = :type")
+    fun _delete(id: Long, type: String)
+}
+
+suspend fun CacheDao.select(id: Long, type: String) = dao {
+    _select(id, type)
+}
+
+suspend fun CacheDao.delete(id: Long, type: String) = dao {
+    _delete(id, type)
+}
+
+/**
+ * Returns true if successful, given that there are constraints to the insertion
+ */
+suspend fun CacheDao.save(id: Long, type: String, contents: String): Boolean = dao {
+    try {
+        _insertCache(CacheEntity(id, type, System.currentTimeMillis(), contents))
+        true
+    } catch (e: Exception) {
+        L.e(e) { "Cache save failed for $type" }
+        false
+    }
+}