streaming: add forward declarations in stream_fwd.hh

To be used for defining streaming::plan_id
in the next patcvh.

Signed-off-by: Benny Halevy <bhalevy@scylladb.com>

streaming/stream_coordinator.hh

@@ -11,6 +11,7 @@
 #pragma once
 
 #include "gms/inet_address.hh"
+#include "streaming/stream_fwd.hh"
 #include "streaming/stream_session.hh"
 #include "streaming/session_info.hh"
 #include <map>

streaming/stream_fwd.hh

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2018-present ScyllaDB
+ */
+
+/*
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#pragma once
+
+namespace streaming {
+
+class stream_event_handler;
+class stream_manager;
+class stream_result_future;
+class stream_session;
+class stream_state;
+
+} // namespace streaming

streaming/stream_manager.hh

@@ -9,6 +9,7 @@
  */
 
 #pragma once
+#include "streaming/stream_fwd.hh"
 #include "streaming/progress_info.hh"
 #include <seastar/core/shared_ptr.hh>
 #include <seastar/core/distributed.hh>
@@ -45,9 +46,6 @@ class gossiper;
 
 namespace streaming {
 
-class stream_session;
-class stream_result_future;
-
 struct stream_bytes {
     int64_t bytes_sent = 0;
     int64_t bytes_received = 0;

streaming/stream_plan.hh

@@ -16,6 +16,7 @@
 #include "gms/inet_address.hh"
 #include "query-request.hh"
 #include "dht/i_partitioner.hh"
+#include "streaming/stream_fwd.hh"
 #include "streaming/stream_coordinator.hh"
 #include "streaming/stream_detail.hh"
 #include "streaming/stream_reason.hh"
@@ -23,9 +24,6 @@
 
 namespace streaming {
 
-class stream_state;
-class stream_event_handler;
-
 /**
  * {@link StreamPlan} is a helper class that builds StreamOperation of given configuration.
  *

streaming/stream_receive_task.hh

@@ -11,13 +11,12 @@
 #pragma once
 
 #include "utils/UUID.hh"
+#include "streaming/stream_fwd.hh"
 #include "streaming/stream_task.hh"
 #include <memory>
 
 namespace streaming {
 
-class stream_session;
-
 /**
  * Task that manages receiving files for the session for certain ColumnFamily.
  */

streaming/stream_transfer_task.hh

@@ -11,6 +11,7 @@
 #pragma once
 
 #include "utils/UUID.hh"
+#include "streaming/stream_fwd.hh"
 #include "streaming/stream_task.hh"
 #include "streaming/stream_detail.hh"
 #include <map>
@@ -18,7 +19,6 @@
 
 namespace streaming {
 
-class stream_session;
 class send_info;
 
 /**