feat: Return explicit StreamWriterClosedException (#1709)

* feat: Return explicit StreamWriterClosedException

* fix format

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google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/Exceptions.java

@@ -83,6 +83,12 @@ protected StreamFinalizedException(Status grpcStatus, String name) {
     }
   }
 
+  public static final class StreamWriterClosedException extends StorageException {
+    protected StreamWriterClosedException(Status grpcStatus, String name) {
+      super(grpcStatus, name, null, null, ImmutableMap.of());
+    }
+  }
+
   /**
    * There was a schema mismatch due to bigquery table with fewer fields than the input message.
    * This can be resolved by updating the table's schema with the message schema.

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/StreamWriter.java

@@ -309,9 +309,10 @@ private ApiFuture<AppendRowsResponse> appendInternal(AppendRowsRequest message)
     try {
       if (userClosed) {
         requestWrapper.appendResult.setException(
-            new StatusRuntimeException(
+            new Exceptions.StreamWriterClosedException(
                 Status.fromCode(Status.Code.FAILED_PRECONDITION)
-                    .withDescription("Connection is already closed")));
+                    .withDescription("Connection is already closed"),
+                streamName));
         return requestWrapper.appendResult;
       }
       // Check if queue is going to be full before adding the request.

google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/StreamWriterTest.java

@@ -653,4 +653,16 @@ public void testWriterClosedStream() throws Exception {
       TimeUnit.SECONDS.sleep(1);
     }
   }
+
+  @Test
+  public void testWriterException() throws Exception {
+    StreamWriter writer = getTestStreamWriter();
+    writer.close();
+    ApiFuture<AppendRowsResponse> appendFuture1 = sendTestMessage(writer, new String[] {"A"}, 0);
+    Exceptions.StreamWriterClosedException actualError =
+        assertFutureException(Exceptions.StreamWriterClosedException.class, appendFuture1);
+    // The basic StatusRuntimeException API is not changed.
+    assertEquals(Status.Code.FAILED_PRECONDITION, actualError.getStatus().getCode());
+    assertTrue(actualError.getStatus().getDescription().contains("Connection is already closed"));
+  }
 }