reorganize directories

[awesomized/libmemcached] / src / libmemcached / purge.cc

diff --git a/src/libmemcached/purge.cc b/src/libmemcached/purge.cc
new file mode 100644 (file)
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+++ b/src/libmemcached/purge.cc
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+/*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
+ * 
+ *  LibMemcached
+ *
+ *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
+ *  Copyright (C) 2006-2009 Brian Aker
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are
+ *  met:
+ *
+ *      * Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ *      * Redistributions in binary form must reproduce the above
+ *  copyright notice, this list of conditions and the following disclaimer
+ *  in the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ *      * The names of its contributors may not be used to endorse or
+ *  promote products derived from this software without specific prior
+ *  written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#include <libmemcached/common.h>
+
+#define memcached_set_purging(__object, __value) ((__object)->state.is_purging= (__value))
+
+class Purge
+{
+public:
+  Purge(Memcached* arg) :
+    _memc(arg)
+  {
+    memcached_set_purging(_memc, true);
+  }
+
+  ~Purge()
+  {
+    memcached_set_purging(_memc, false);
+  }
+
+private:
+  Memcached* _memc;
+};
+
+class PollTimeout
+{
+public:
+  PollTimeout(Memcached* arg) :
+    _timeout(arg->poll_timeout),
+    _origin(arg->poll_timeout)
+  {
+    _origin = 2000;
+  }
+
+  ~PollTimeout()
+  {
+    _origin= _timeout;
+  }
+
+private:
+  int32_t _timeout;
+  int32_t& _origin;
+};
+
+bool memcached_purge(memcached_instance_st* ptr)
+{
+  Memcached *root= (Memcached *)ptr->root;
+
+  if (memcached_is_purging(ptr->root) || /* already purging */
+      (memcached_server_response_count(ptr) < ptr->root->io_msg_watermark &&
+       ptr->io_bytes_sent < ptr->root->io_bytes_watermark) ||
+      (ptr->io_bytes_sent >= ptr->root->io_bytes_watermark &&
+       memcached_server_response_count(ptr) < 2))
+  {
+    return true;
+  }
+
+  /*
+    memcached_io_write and memcached_response may call memcached_purge
+    so we need to be able stop any recursion.. 
+  */
+  Purge set_purge(root);
+
+  WATCHPOINT_ASSERT(ptr->fd != INVALID_SOCKET);
+  /* 
+    Force a flush of the buffer to ensure that we don't have the n-1 pending
+    requests buffered up.. 
+  */
+  if (memcached_io_write(ptr) == false)
+  {
+    memcached_io_reset(ptr);
+    memcached_set_error(*ptr, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
+    return false;
+  }
+  WATCHPOINT_ASSERT(ptr->fd != INVALID_SOCKET);
+
+  bool is_successful= true;
+  uint32_t no_msg= memcached_server_response_count(ptr);
+  if (no_msg > 1)
+  {
+    memcached_result_st result;
+
+    /*
+     * We need to increase the timeout, because we might be waiting for
+     * data to be sent from the server (the commands was in the output buffer
+     * and just flushed
+   */
+    PollTimeout poll_timeout(ptr->root);
+
+    memcached_result_st* result_ptr= memcached_result_create(root, &result);
+    assert(result_ptr);
+
+    for (uint32_t x= 0; x < no_msg - 1; x++)
+    {
+      memcached_result_reset(result_ptr);
+      memcached_return_t rc= memcached_read_one_response(ptr, result_ptr);
+      /*
+       * Purge doesn't care for what kind of command results that is received.
+       * The only kind of errors I care about if is I'm out of sync with the
+       * protocol or have problems reading data from the network..
+     */
+      if (rc== MEMCACHED_PROTOCOL_ERROR or rc == MEMCACHED_UNKNOWN_READ_FAILURE or rc == MEMCACHED_READ_FAILURE)
+      {
+        WATCHPOINT_ERROR(rc);
+        is_successful= false;
+      }
+
+      if (ptr->root->callbacks != NULL)
+      {
+        memcached_callback_st cb = *ptr->root->callbacks;
+        if (memcached_success(rc))
+        {
+          for (uint32_t y= 0; y < cb.number_of_callback; y++)
+          {
+            if (memcached_fatal((*cb.callback[y])(ptr->root, result_ptr, cb.context)))
+            {
+              break;
+            }
+          }
+        }
+      }
+    }
+
+    memcached_result_free(result_ptr);
+  }
+
+  return is_successful;
+}