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<a href="impl_2codegen_2message__allocator_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * Copyright 2019 gRPC authors.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * you may not use this file except in compliance with the License.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> * limitations under the License.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; </div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor">#ifndef GRPCPP_IMPL_CODEGEN_MESSAGE_ALLOCATOR_H</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#define GRPCPP_IMPL_CODEGEN_MESSAGE_ALLOCATOR_H</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacegrpc.html">grpc</a> {</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#ifndef GRPC_CALLBACK_API_NONEXPERIMENTAL</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="keyword">namespace </span>experimental {</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="comment">// NOTE: This is an API for advanced users who need custom allocators.</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="comment">// Per rpc struct for the allocator. This is the interface to return to user.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html"> 29</a></span>&#160;<span class="keyword">class </span><a class="code" href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html">RpcAllocatorState</a> {</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; <span class="keyword">virtual</span> <a class="code" href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html#aa2f076faaed3c8f2b7a113bf38e9c9dd">~RpcAllocatorState</a>() = <span class="keywordflow">default</span>;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; <span class="comment">// Optionally deallocate request early to reduce the size of working set.</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="comment">// A custom MessageAllocator needs to be registered to make use of this.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="comment">// This is not abstract because implementing it is optional.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html#a75dc7544cb4886b53fcc5a7c98e525f5"> 35</a></span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html#a75dc7544cb4886b53fcc5a7c98e525f5">FreeRequest</a>() {}</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;};</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; </div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="comment">// This is the interface returned by the allocator.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="comment">// grpc library will call the methods to get request/response pointers and to</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="comment">// release the object when it is done.</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> RequestT, <span class="keyword">typename</span> ResponseT&gt;</div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="classgrpc_1_1experimental_1_1_message_holder.html"> 42</a></span>&#160;<span class="keyword">class </span><a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html">MessageHolder</a> : <span class="keyword">public</span> <a class="code" href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html">RpcAllocatorState</a> {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="comment">// Release this object. For example, if the custom allocator&#39;s</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="comment">// AllocateMessasge creates an instance of a subclass with new, the Release()</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="comment">// should do a &quot;delete this;&quot;.</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#af488004fd9d0e21865e123a2920ad75c">Release</a>() = 0;</div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="classgrpc_1_1experimental_1_1_message_holder.html#af8dfca1336d734a4f3406327d35e22b7"> 48</a></span>&#160; RequestT* <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#af8dfca1336d734a4f3406327d35e22b7">request</a>() { <span class="keywordflow">return</span> request_; }</div>
<div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="classgrpc_1_1experimental_1_1_message_holder.html#a169fb5a4b742b8a55b04fc9dec54aecb"> 49</a></span>&#160; ResponseT* <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#a169fb5a4b742b8a55b04fc9dec54aecb">response</a>() { <span class="keywordflow">return</span> response_; }</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="classgrpc_1_1experimental_1_1_message_holder.html#a3c627621eb7f90440e0fae41ebdbae10"> 52</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#a3c627621eb7f90440e0fae41ebdbae10">set_request</a>(RequestT* <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#af8dfca1336d734a4f3406327d35e22b7">request</a>) { request_ = <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#af8dfca1336d734a4f3406327d35e22b7">request</a>; }</div>
<div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="classgrpc_1_1experimental_1_1_message_holder.html#a8bed5c98e17cff87b7641d527c84fac3"> 53</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#a8bed5c98e17cff87b7641d527c84fac3">set_response</a>(ResponseT* <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#a169fb5a4b742b8a55b04fc9dec54aecb">response</a>) { response_ = <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html#a169fb5a4b742b8a55b04fc9dec54aecb">response</a>; }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="comment">// NOTE: subclasses should set these pointers.</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; RequestT* request_;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; ResponseT* response_;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;};</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;<span class="comment">// A custom allocator can be set via the generated code to a callback unary</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;<span class="comment">// method, such as SetMessageAllocatorFor_Echo(custom_allocator). The allocator</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;<span class="comment">// needs to be alive for the lifetime of the server.</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="comment">// Implementations need to be thread-safe.</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> RequestT, <span class="keyword">typename</span> ResponseT&gt;</div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="classgrpc_1_1experimental_1_1_message_allocator.html"> 66</a></span>&#160;<span class="keyword">class </span><a class="code" href="classgrpc_1_1experimental_1_1_message_allocator.html">MessageAllocator</a> {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keyword">virtual</span> <a class="code" href="classgrpc_1_1experimental_1_1_message_allocator.html#a38af212fa464af133766f491eb3b6b09">~MessageAllocator</a>() = <span class="keywordflow">default</span>;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="keyword">virtual</span> <a class="code" href="classgrpc_1_1experimental_1_1_message_holder.html">MessageHolder&lt;RequestT, ResponseT&gt;</a>* <a class="code" href="classgrpc_1_1experimental_1_1_message_allocator.html#a9627bd3f63ab330465cd4c155bb8cc00">AllocateMessages</a>() = 0;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;};</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;<span class="preprocessor">#ifndef GRPC_CALLBACK_API_NONEXPERIMENTAL</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;} <span class="comment">// namespace experimental</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; </div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;<span class="comment">// TODO(vjpai): Remove namespace experimental when de-experimentalized fully.</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;<span class="preprocessor">#ifdef GRPC_CALLBACK_API_NONEXPERIMENTAL</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;<span class="keyword">namespace </span>experimental {</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;using ::grpc::RpcAllocatorState;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; </div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> RequestT, <span class="keyword">typename</span> ResponseT&gt;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;<span class="keyword">using</span> MessageHolder = ::grpc::MessageHolder&lt;RequestT, ResponseT&gt;;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> RequestT, <span class="keyword">typename</span> ResponseT&gt;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;<span class="keyword">using</span> MessageAllocator = ::grpc::MessageAllocator&lt;RequestT, ResponseT&gt;;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; </div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;} <span class="comment">// namespace experimental</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;} <span class="comment">// namespace grpc</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; </div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160;<span class="preprocessor">#endif // GRPCPP_IMPL_CODEGEN_MESSAGE_ALLOCATOR_H</span></div>
</div><!-- fragment --></div><!-- contents -->
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_rpc_allocator_state_html_aa2f076faaed3c8f2b7a113bf38e9c9dd"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html#aa2f076faaed3c8f2b7a113bf38e9c9dd">grpc::experimental::RpcAllocatorState::~RpcAllocatorState</a></div><div class="ttdeci">virtual ~RpcAllocatorState()=default</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_holder_html_a3c627621eb7f90440e0fae41ebdbae10"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_holder.html#a3c627621eb7f90440e0fae41ebdbae10">grpc::experimental::MessageHolder::set_request</a></div><div class="ttdeci">void set_request(RequestT *request)</div><div class="ttdef"><b>Definition:</b> message_allocator.h:52</div></div>
<div class="ttc" id="anamespacegrpc_html"><div class="ttname"><a href="namespacegrpc.html">grpc</a></div><div class="ttdoc">This header provides an object that reads bytes directly from a grpc::ByteBuffer, via the ZeroCopyInp...</div><div class="ttdef"><b>Definition:</b> alarm.h:24</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_allocator_html"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_allocator.html">grpc::experimental::MessageAllocator</a></div><div class="ttdef"><b>Definition:</b> message_allocator.h:66</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_allocator_html_a38af212fa464af133766f491eb3b6b09"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_allocator.html#a38af212fa464af133766f491eb3b6b09">grpc::experimental::MessageAllocator::~MessageAllocator</a></div><div class="ttdeci">virtual ~MessageAllocator()=default</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_rpc_allocator_state_html_a75dc7544cb4886b53fcc5a7c98e525f5"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html#a75dc7544cb4886b53fcc5a7c98e525f5">grpc::experimental::RpcAllocatorState::FreeRequest</a></div><div class="ttdeci">virtual void FreeRequest()</div><div class="ttdef"><b>Definition:</b> message_allocator.h:35</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_rpc_allocator_state_html"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_rpc_allocator_state.html">grpc::experimental::RpcAllocatorState</a></div><div class="ttdef"><b>Definition:</b> message_allocator.h:29</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_holder_html_a8bed5c98e17cff87b7641d527c84fac3"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_holder.html#a8bed5c98e17cff87b7641d527c84fac3">grpc::experimental::MessageHolder::set_response</a></div><div class="ttdeci">void set_response(ResponseT *response)</div><div class="ttdef"><b>Definition:</b> message_allocator.h:53</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_holder_html_a169fb5a4b742b8a55b04fc9dec54aecb"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_holder.html#a169fb5a4b742b8a55b04fc9dec54aecb">grpc::experimental::MessageHolder::response</a></div><div class="ttdeci">ResponseT * response()</div><div class="ttdef"><b>Definition:</b> message_allocator.h:49</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_allocator_html_a9627bd3f63ab330465cd4c155bb8cc00"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_allocator.html#a9627bd3f63ab330465cd4c155bb8cc00">grpc::experimental::MessageAllocator::AllocateMessages</a></div><div class="ttdeci">virtual MessageHolder&lt; RequestT, ResponseT &gt; * AllocateMessages()=0</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_holder_html_af488004fd9d0e21865e123a2920ad75c"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_holder.html#af488004fd9d0e21865e123a2920ad75c">grpc::experimental::MessageHolder::Release</a></div><div class="ttdeci">virtual void Release()=0</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_holder_html"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_holder.html">grpc::experimental::MessageHolder</a></div><div class="ttdef"><b>Definition:</b> message_allocator.h:42</div></div>
<div class="ttc" id="aclassgrpc_1_1experimental_1_1_message_holder_html_af8dfca1336d734a4f3406327d35e22b7"><div class="ttname"><a href="classgrpc_1_1experimental_1_1_message_holder.html#af8dfca1336d734a4f3406327d35e22b7">grpc::experimental::MessageHolder::request</a></div><div class="ttdeci">RequestT * request()</div><div class="ttdef"><b>Definition:</b> message_allocator.h:48</div></div>
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