Added HikariCP as connection pool manager for efficient database connection management.

build.gradle.kts

@@ -32,6 +32,7 @@ dependencies {
     implementation("com.squareup.okhttp3:okhttp:4.12.0")
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.1")
     implementation("org.slf4j:slf4j-api:2.0.16")
+    implementation("com.zaxxer:HikariCP:6.0.0")
     testImplementation("io.ktor:ktor-server-test-host-jvm")
     testImplementation("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version")
 }

src/main/kotlin/net/ipksindia/config/AppConfig.kt

@@ -84,5 +84,5 @@ data class DatabaseConfig(
     val user: String,
     val password: String
 ) {
-    val dbUrl = "jdbc:oracle:thin:@$host:$port:$name"
+    val url = "jdbc:oracle:thin:@$host:$port:$name"
 }

src/main/kotlin/net/ipksindia/dao/DatabaseFactory.kt

@@ -0,0 +1,25 @@
+package net.ipksindia.dao
+
+import com.zaxxer.hikari.HikariConfig
+import com.zaxxer.hikari.HikariDataSource
+import net.ipksindia.config.AppConfig
+import java.sql.Connection
+
+class DatabaseFactory private constructor() {
+    private val dataSource: HikariDataSource
+
+    init {
+        val config = HikariConfig()
+        config.jdbcUrl = AppConfig.databaseConfig.url
+        config.username = AppConfig.databaseConfig.user
+        config.password = AppConfig.databaseConfig.password
+        config.maximumPoolSize = 5
+        dataSource = HikariDataSource(config)
+    }
+
+    fun getConnection(): Connection = dataSource.connection
+
+    companion object {
+        val instance = DatabaseFactory()
+    }
+}

src/main/kotlin/net/ipksindia/dao/TransactionDao.kt

@@ -1,17 +1,11 @@
 package net.ipksindia.dao
 
 import model.TransactionRequest
-import net.ipksindia.config.AppConfig
 import java.sql.Date
-import java.sql.DriverManager
 import java.sql.ResultSet
 
 class TransactionDao() {
 
-    private val dbUrl = AppConfig.databaseConfig.dbUrl
-    private val dbUser = AppConfig.databaseConfig.user
-    private val dbPassword = AppConfig.databaseConfig.password
-
     private val singleTransactionRequestQuery = """
        SELECT 
             txn_no,
@@ -69,8 +63,7 @@ class TransactionDao() {
     """.trimIndent()
 
     fun updateSuccessTransaction(request: TransactionRequest, transferQueueNumber: String, neftQueueNumber: String) {
-        DriverManager
-            .getConnection(dbUrl, dbUser, dbPassword)
+        DatabaseFactory.instance.getConnection()
             .use { connection ->
                 connection
                     .prepareStatement(transactionUpdateQuery)
@@ -100,8 +93,8 @@ class TransactionDao() {
     }
 
     fun getTransactionRequest(transactionNumber: String): TransactionRequest? {
-        return DriverManager
-            .getConnection(dbUrl, dbUser, dbPassword)
+        return DatabaseFactory.instance
+            .getConnection()
             .use { connection ->
                 connection
                     .prepareStatement(singleTransactionRequestQuery)