QUIC - Added histograms to track how cache ie performing when server

net/quic/core/crypto/quic_server_info.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_CRYPTO_QUIC_SERVER_INFO_H_
 #define NET_QUIC_CRYPTO_QUIC_SERVER_INFO_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/quic/core/quic_server_id.h"
 
 namespace net {
 
 class X509Certificate;
 
 // QuicServerInfo is an interface for fetching information about a QUIC server.
 // This information may be stored on disk so does not include keys or other
 // sensitive information. Primarily it's intended for caching the QUIC server's
 // crypto config.
 class NET_EXPORT_PRIVATE QuicServerInfo {
  public:
+  // Enum to track number of times data read/parse/write API calls of
+  // QuicServerInfo to and from disk cache is called.
+  enum QuicServerInfoAPICall {
+    QUIC_SERVER_INFO_START = 0,
+    QUIC_SERVER_INFO_WAIT_FOR_DATA_READY = 1,
+    QUIC_SERVER_INFO_PARSE = 2,
+    QUIC_SERVER_INFO_WAIT_FOR_DATA_READY_CANCEL = 3,
+    QUIC_SERVER_INFO_READY_TO_PERSIST = 4,
+    QUIC_SERVER_INFO_PERSIST = 5,
+    QUIC_SERVER_INFO_EXTERNAL_CACHE_HIT = 6,
+    QUIC_SERVER_INFO_RESET_WAIT_FOR_DATA_READY = 7,
+    QUIC_SERVER_INFO_NUM_OF_API_CALLS = 8,
+  };
+
+  // Enum to track failure reasons to read/load/write of QuicServerInfo to
+  // and from disk cache.
+  enum FailureReason {
+    WAIT_FOR_DATA_READY_INVALID_ARGUMENT_FAILURE = 0,
+    GET_BACKEND_FAILURE = 1,
+    OPEN_FAILURE = 2,
+    CREATE_OR_OPEN_FAILURE = 3,
+    PARSE_NO_DATA_FAILURE = 4,
+    PARSE_FAILURE = 5,
+    READ_FAILURE = 6,
+    READY_TO_PERSIST_FAILURE = 7,
+    PERSIST_NO_BACKEND_FAILURE = 8,
+    WRITE_FAILURE = 9,
+    NO_FAILURE = 10,
+    PARSE_DATA_DECODE_FAILURE = 11,
+    NUM_OF_FAILURES = 12,
+  };
+
   explicit QuicServerInfo(const QuicServerId& server_id);
   virtual ~QuicServerInfo();
 
   // Start will commence the lookup. This must be called before any other
   // methods. By opportunistically calling this early, it may be possible to
   // overlap this object's lookup and reduce latency.
   virtual void Start() = 0;
 
   // WaitForDataReady returns OK if the fetch of the requested data has
   // completed. Otherwise it returns ERR_IO_PENDING and will call |callback| on
@@ skipping 101 matching lines @@
   // |server_id| or NULL on failure.
   virtual QuicServerInfo* GetForServer(const QuicServerId& server_id) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicServerInfoFactory);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_QUIC_SERVER_INFO_H_