fix(client): don't close client on withOptions usage when original is gc'd

Author: stainless-app[bot]

modern-treasury-java-core/src/main/kotlin/com/moderntreasury/api/core/ClientOptions.kt

@@ -103,7 +103,9 @@ private constructor(
             webhookKey = clientOptions.webhookKey
         }
 
-        fun httpClient(httpClient: HttpClient) = apply { this.httpClient = httpClient }
+        fun httpClient(httpClient: HttpClient) = apply {
+            this.httpClient = PhantomReachableClosingHttpClient(httpClient)
+        }
 
         fun checkJacksonVersionCompatibility(checkJacksonVersionCompatibility: Boolean) = apply {
             this.checkJacksonVersionCompatibility = checkJacksonVersionCompatibility
@@ -269,14 +271,12 @@ private constructor(
 
             return ClientOptions(
                 httpClient,
-                PhantomReachableClosingHttpClient(
-                    RetryingHttpClient.builder()
-                        .httpClient(httpClient)
-                        .clock(clock)
-                        .maxRetries(maxRetries)
-                        .idempotencyHeader("Idempotency-Key")
-                        .build()
-                ),
+                RetryingHttpClient.builder()
+                    .httpClient(httpClient)
+                    .clock(clock)
+                    .maxRetries(maxRetries)
+                    .idempotencyHeader("Idempotency-Key")
+                    .build(),
                 checkJacksonVersionCompatibility,
                 jsonMapper,
                 streamHandlerExecutor

modern-treasury-java-core/src/test/kotlin/com/moderntreasury/api/core/ClientOptionsTest.kt

@@ -0,0 +1,37 @@
+// File generated from our OpenAPI spec by Stainless.
+
+package com.moderntreasury.api.core
+
+import com.moderntreasury.api.core.http.HttpClient
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+import org.mockito.junit.jupiter.MockitoExtension
+import org.mockito.kotlin.mock
+import org.mockito.kotlin.never
+import org.mockito.kotlin.verify
+
+@ExtendWith(MockitoExtension::class)
+internal class ClientOptionsTest {
+
+    @Test
+    fun toBuilder_whenOriginalClientOptionsGarbageCollected_doesNotCloseOriginalClient() {
+        val httpClient = mock<HttpClient>()
+        var clientOptions =
+            ClientOptions.builder()
+                .httpClient(httpClient)
+                .apiKey("My API Key")
+                .organizationId("my-organization-ID")
+                .build()
+        verify(httpClient, never()).close()
+
+        // Overwrite the `clientOptions` variable so that the original `ClientOptions` is GC'd.
+        clientOptions = clientOptions.toBuilder().build()
+        System.gc()
+        Thread.sleep(100)
+
+        verify(httpClient, never()).close()
+        // This exists so that `clientOptions` is still reachable.
+        assertThat(clientOptions).isEqualTo(clientOptions)
+    }
+}