1 files changed, 74 insertions, 0 deletions
diff --git a/src/librbd/watcher/Utils.h b/src/librbd/watcher/Utils.h
new file mode 100644
index 000000000..d2510aaf3
--- /dev/null
+++ b/src/librbd/watcher/Utils.h
@@ -0,0 +1,74 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_WATCHER_UTILS_H
+#define CEPH_LIBRBD_WATCHER_UTILS_H
+
+#include "include/buffer_fwd.h"
+#include "include/encoding.h"
+#include "include/Context.h"
+#include "librbd/Watcher.h"
+
+namespace ceph { class Formatter; }
+
+namespace librbd {
+namespace watcher {
+namespace util {
+
+template <typename Watcher>
+struct HandlePayloadVisitor : public boost::static_visitor<void> {
+  Watcher *watcher;
+  uint64_t notify_id;
+  uint64_t handle;
+
+  HandlePayloadVisitor(Watcher *watcher_, uint64_t notify_id_,
+      uint64_t handle_)
+    : watcher(watcher_), notify_id(notify_id_), handle(handle_)
+  {
+  }
+
+  template <typename P>
+  inline void operator()(const P &payload) const {
+    typename Watcher::C_NotifyAck *ctx =
+      new typename Watcher::C_NotifyAck(watcher, notify_id, handle);
+    if (watcher->handle_payload(payload, ctx)) {
+      ctx->complete(0);
+    }
+  }
+};
+
+class EncodePayloadVisitor : public boost::static_visitor<void> {
+public:
+  explicit EncodePayloadVisitor(bufferlist &bl) : m_bl(bl) {}
+
+  template <typename P>
+  inline void operator()(const P &payload) const {
+    using ceph::encode;
+    encode(static_cast<uint32_t>(P::NOTIFY_OP), m_bl);
+    payload.encode(m_bl);
+  }
+
+private:
+  bufferlist &m_bl;
+};
+
+class DecodePayloadVisitor : public boost::static_visitor<void> {
+public:
+  DecodePayloadVisitor(__u8 version, bufferlist::const_iterator &iter)
+    : m_version(version), m_iter(iter) {}
+
+  template <typename P>
+  inline void operator()(P &payload) const {
+    payload.decode(m_version, m_iter);
+  }
+
+private:
+  __u8 m_version;
+  bufferlist::const_iterator &m_iter;
+};
+
+} // namespace util
+} // namespace watcher
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_WATCHER_UTILS_H