| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.tuweni.kv |
| |
| import com.jolbox.bonecp.BoneCP |
| import com.jolbox.bonecp.BoneCPConfig |
| import kotlinx.coroutines.Dispatchers |
| import kotlinx.coroutines.guava.await |
| import org.apache.tuweni.bytes.Bytes |
| import java.io.IOException |
| import java.sql.ResultSet |
| import java.sql.SQLException |
| import kotlin.coroutines.CoroutineContext |
| |
| /** |
| * A key-value store backed by a relational database. |
| * |
| * @param jdbcurl The JDBC url to connect to the database. |
| * @param tableName the name of the table to use for storage. |
| * @param keyColumn the key column of the store. |
| * @param valueColumn the value column of the store. |
| * @param coroutineContext The co-routine context for blocking tasks. |
| * @return A key-value store. |
| * @throws IOException If an I/O error occurs. |
| * @constructor Open a relational database backed key-value store. |
| */ |
| class SQLKeyValueStore |
| @Throws(IOException::class) |
| constructor( |
| jdbcurl: String, |
| val tableName: String = "store", |
| val keyColumn: String = "key", |
| val valueColumn: String = "value", |
| override val coroutineContext: CoroutineContext = Dispatchers.IO |
| ) : KeyValueStore { |
| |
| companion object { |
| /** |
| * Open a relational database backed key-value store. |
| * |
| * @param jdbcUrl The JDBC url to connect to the database. |
| * @return A key-value store. |
| * @throws IOException If an I/O error occurs. |
| */ |
| @JvmStatic |
| @Throws(IOException::class) |
| fun open(jdbcUrl: String) = SQLKeyValueStore(jdbcUrl) |
| |
| /** |
| * Open a relational database backed key-value store. |
| * |
| * @param jdbcUrl The JDBC url to connect to the database. |
| * @param tableName the name of the table to use for storage. |
| * @param keyColumn the key column of the store. |
| * @param valueColumn the value column of the store. |
| * @return A key-value store. |
| * @throws IOException If an I/O error occurs. |
| */ |
| @JvmStatic |
| @Throws(IOException::class) |
| fun open(jdbcUrl: String, tableName: String, keyColumn: String, valueColumn: String) = |
| SQLKeyValueStore(jdbcUrl, tableName, keyColumn, valueColumn) |
| } |
| |
| private val connectionPool: BoneCP |
| |
| init { |
| val config = BoneCPConfig() |
| config.jdbcUrl = jdbcurl |
| |
| connectionPool = BoneCP(config) |
| } |
| |
| override suspend fun get(key: Bytes): Bytes? { |
| connectionPool.asyncConnection.await().use { |
| val stmt = it.prepareStatement("SELECT $valueColumn FROM $tableName WHERE $keyColumn = ?") |
| stmt.setBytes(1, key.toArrayUnsafe()) |
| stmt.execute() |
| |
| val rs = stmt.resultSet |
| |
| return if (rs.next()) { |
| Bytes.wrap(rs.getBytes(1)) |
| } else { |
| null |
| } |
| } |
| } |
| |
| override suspend fun put(key: Bytes, value: Bytes) { |
| connectionPool.asyncConnection.await().use { |
| val stmt = it.prepareStatement("INSERT INTO $tableName($keyColumn, $valueColumn) VALUES(?,?)") |
| stmt.setBytes(1, key.toArrayUnsafe()) |
| stmt.setBytes(2, value.toArrayUnsafe()) |
| it.autoCommit = false |
| try { |
| stmt.execute() |
| } catch (e: SQLException) { |
| val updateStmt = it.prepareStatement("UPDATE $tableName SET $valueColumn=? WHERE $keyColumn=?") |
| updateStmt.setBytes(1, value.toArrayUnsafe()) |
| updateStmt.setBytes(2, key.toArrayUnsafe()) |
| updateStmt.execute() |
| } |
| it.commit() |
| Unit |
| } |
| } |
| |
| private class SQLIterator(val resultSet: ResultSet) : Iterator<Bytes> { |
| |
| private var next = resultSet.next() |
| |
| override fun hasNext(): Boolean = next |
| |
| override fun next(): Bytes { |
| val key = Bytes.wrap(resultSet.getBytes(1)) |
| next = resultSet.next() |
| return key |
| } |
| } |
| |
| override suspend fun keys(): Iterable<Bytes> { |
| connectionPool.asyncConnection.await().use { |
| val stmt = it.prepareStatement("SELECT $keyColumn FROM $tableName") |
| stmt.execute() |
| return Iterable { SQLIterator(stmt.resultSet) } |
| } |
| } |
| |
| /** |
| * Closes the underlying connection pool. |
| */ |
| override fun close() = connectionPool.shutdown() |
| } |