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<div class="header">
  <div class="summary">
<a href="#pub-methods">Instance Methods</a> &#124;
<a href="#pub-static-methods">Class Methods</a>  </div>
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<div class="title">GRPCInterceptor Class Reference</div>  </div>
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<p>Base class for a gRPC interceptor.  
 <a href="interface_g_r_p_c_interceptor.html#details">More...</a></p>

<p><code>#import &lt;<a class="el" href="_g_r_p_c_interceptor_8h_source.html">GRPCInterceptor.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Instance Methods</h2></td></tr>
<tr class="memitem:ae5df94d26ea028ec2210deb12f08c416"><td class="memItemLeft" align="right" valign="top">(instancetype)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#ae5df94d26ea028ec2210deb12f08c416">NS_UNAVAILABLE</a></td></tr>
<tr class="separator:ae5df94d26ea028ec2210deb12f08c416"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a29c874944bed7d25a374e5305649aacc"><td class="memItemLeft" align="right" valign="top">(nullable instancetype)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#a29c874944bed7d25a374e5305649aacc">initWithInterceptorManager:dispatchQueue:</a></td></tr>
<tr class="memdesc:a29c874944bed7d25a374e5305649aacc"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialize the interceptor with the next interceptor in the chain, and provide the dispatch queue that this interceptor's methods are dispatched onto.  <a href="interface_g_r_p_c_interceptor.html#a29c874944bed7d25a374e5305649aacc">More...</a><br /></td></tr>
<tr class="separator:a29c874944bed7d25a374e5305649aacc"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:acede282262511aab39a7dc3b57526aac"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#acede282262511aab39a7dc3b57526aac">startWithRequestOptions:callOptions:</a></td></tr>
<tr class="memdesc:acede282262511aab39a7dc3b57526aac"><td class="mdescLeft">&#160;</td><td class="mdescRight">To start the call.  <a href="interface_g_r_p_c_interceptor.html#acede282262511aab39a7dc3b57526aac">More...</a><br /></td></tr>
<tr class="separator:acede282262511aab39a7dc3b57526aac"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a6ee64864731acebc4fa4b3ca47a43f36"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#a6ee64864731acebc4fa4b3ca47a43f36">writeData:</a></td></tr>
<tr class="memdesc:a6ee64864731acebc4fa4b3ca47a43f36"><td class="mdescLeft">&#160;</td><td class="mdescRight">To write data to the call.  <a href="interface_g_r_p_c_interceptor.html#a6ee64864731acebc4fa4b3ca47a43f36">More...</a><br /></td></tr>
<tr class="separator:a6ee64864731acebc4fa4b3ca47a43f36"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a53a77a72ebaf711d17e59cb243169032"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#a53a77a72ebaf711d17e59cb243169032">finish</a></td></tr>
<tr class="memdesc:a53a77a72ebaf711d17e59cb243169032"><td class="mdescLeft">&#160;</td><td class="mdescRight">To finish the stream of requests.  <a href="interface_g_r_p_c_interceptor.html#a53a77a72ebaf711d17e59cb243169032">More...</a><br /></td></tr>
<tr class="separator:a53a77a72ebaf711d17e59cb243169032"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aaab821f901be3d354d9fce8f98a12979"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#aaab821f901be3d354d9fce8f98a12979">cancel</a></td></tr>
<tr class="memdesc:aaab821f901be3d354d9fce8f98a12979"><td class="mdescLeft">&#160;</td><td class="mdescRight">To cancel the call.  <a href="interface_g_r_p_c_interceptor.html#aaab821f901be3d354d9fce8f98a12979">More...</a><br /></td></tr>
<tr class="separator:aaab821f901be3d354d9fce8f98a12979"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a1e93189dcb502c1f85856f712a384877"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#a1e93189dcb502c1f85856f712a384877">receiveNextMessages:</a></td></tr>
<tr class="memdesc:a1e93189dcb502c1f85856f712a384877"><td class="mdescLeft">&#160;</td><td class="mdescRight">To indicate the call that the previous interceptor is ready to receive more messages.  <a href="interface_g_r_p_c_interceptor.html#a1e93189dcb502c1f85856f712a384877">More...</a><br /></td></tr>
<tr class="separator:a1e93189dcb502c1f85856f712a384877"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a0a50fe0dc7ce33c82814c4949b8f282a"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#a0a50fe0dc7ce33c82814c4949b8f282a">didReceiveInitialMetadata:</a></td></tr>
<tr class="memdesc:a0a50fe0dc7ce33c82814c4949b8f282a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Issued when initial metadata is received from the server.  <a href="interface_g_r_p_c_interceptor.html#a0a50fe0dc7ce33c82814c4949b8f282a">More...</a><br /></td></tr>
<tr class="separator:a0a50fe0dc7ce33c82814c4949b8f282a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae1a71998631c23254d3667b6de40b487"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#ae1a71998631c23254d3667b6de40b487">didReceiveData:</a></td></tr>
<tr class="memdesc:ae1a71998631c23254d3667b6de40b487"><td class="mdescLeft">&#160;</td><td class="mdescRight">Issued when gRPC message is received from the server.  <a href="interface_g_r_p_c_interceptor.html#ae1a71998631c23254d3667b6de40b487">More...</a><br /></td></tr>
<tr class="separator:ae1a71998631c23254d3667b6de40b487"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a3788cf6d26ec1df66e975bd571280090"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#a3788cf6d26ec1df66e975bd571280090">didCloseWithTrailingMetadata:error:</a></td></tr>
<tr class="memdesc:a3788cf6d26ec1df66e975bd571280090"><td class="mdescLeft">&#160;</td><td class="mdescRight">Issued when a call finished.  <a href="interface_g_r_p_c_interceptor.html#a3788cf6d26ec1df66e975bd571280090">More...</a><br /></td></tr>
<tr class="separator:a3788cf6d26ec1df66e975bd571280090"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a4a9d9fbfe49dbe6305ced6cc516da038"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_g_r_p_c_interceptor.html#a4a9d9fbfe49dbe6305ced6cc516da038">didWriteData</a></td></tr>
<tr class="memdesc:a4a9d9fbfe49dbe6305ced6cc516da038"><td class="mdescLeft">&#160;</td><td class="mdescRight">Issued when flow control is enabled for the call and a message written with GRPCCall2::writeData is passed to gRPC core with SEND_MESSAGE operation.  <a href="interface_g_r_p_c_interceptor.html#a4a9d9fbfe49dbe6305ced6cc516da038">More...</a><br /></td></tr>
<tr class="separator:a4a9d9fbfe49dbe6305ced6cc516da038"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pub_methods_protocol_g_r_p_c_response_handler-p"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_protocol_g_r_p_c_response_handler-p')"><img src="closed.png" alt="-"/>&#160;Instance Methods inherited from <a class="el" href="protocol_g_r_p_c_response_handler-p.html">&lt;GRPCResponseHandler&gt;</a></td></tr>
<tr class="memitem:a1cc519d6bf578da70a507197c99dc312 inherit pub_methods_protocol_g_r_p_c_response_handler-p"><td class="memItemLeft" align="right" valign="top">(void)&#160;</td><td class="memItemRight" valign="bottom">- <a class="el" href="protocol_g_r_p_c_response_handler-p.html#a1cc519d6bf578da70a507197c99dc312">didReceiveRawMessage:</a></td></tr>
<tr class="memdesc:a1cc519d6bf578da70a507197c99dc312 inherit pub_methods_protocol_g_r_p_c_response_handler-p"><td class="mdescLeft">&#160;</td><td class="mdescRight">Issued when a message is received from the server.  <a href="protocol_g_r_p_c_response_handler-p.html#a1cc519d6bf578da70a507197c99dc312">More...</a><br /></td></tr>
<tr class="separator:a1cc519d6bf578da70a507197c99dc312 inherit pub_methods_protocol_g_r_p_c_response_handler-p"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Class Methods</h2></td></tr>
<tr class="memitem:ae5df94d26ea028ec2210deb12f08c416"><td class="memItemLeft" align="right" valign="top">(instancetype)&#160;</td><td class="memItemRight" valign="bottom">+ <a class="el" href="interface_g_r_p_c_interceptor.html#ae5df94d26ea028ec2210deb12f08c416">NS_UNAVAILABLE</a></td></tr>
<tr class="separator:ae5df94d26ea028ec2210deb12f08c416"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="inherited"></a>
Additional Inherited Members</h2></td></tr>
<tr class="inherit_header properties_protocol_g_r_p_c_dispatchable-p"><td colspan="2" onclick="javascript:toggleInherit('properties_protocol_g_r_p_c_dispatchable-p')"><img src="closed.png" alt="-"/>&#160;Properties inherited from <a class="el" href="protocol_g_r_p_c_dispatchable-p.html">&lt;GRPCDispatchable&gt;</a></td></tr>
<tr class="memitem:ab896f3635c26fb9185a79c0aa26e89c0 inherit properties_protocol_g_r_p_c_dispatchable-p"><td class="memItemLeft" align="right" valign="top">dispatch_queue_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="protocol_g_r_p_c_dispatchable-p.html#ab896f3635c26fb9185a79c0aa26e89c0">dispatchQueue</a></td></tr>
<tr class="memdesc:ab896f3635c26fb9185a79c0aa26e89c0 inherit properties_protocol_g_r_p_c_dispatchable-p"><td class="mdescLeft">&#160;</td><td class="mdescRight">The dispatch queue where the object's methods should be run on.  <a href="protocol_g_r_p_c_dispatchable-p.html#ab896f3635c26fb9185a79c0aa26e89c0">More...</a><br /></td></tr>
<tr class="separator:ab896f3635c26fb9185a79c0aa26e89c0 inherit properties_protocol_g_r_p_c_dispatchable-p"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Base class for a gRPC interceptor. </p>
<p>The implementation of the base class provides default behavior of an interceptor, which is simply forward a request/callback to the next/previous interceptor in the chain. The base class implementation uses the same dispatch queue for both requests and callbacks.</p>
<p>An interceptor implementation should inherit from this base class and initialize the base class with [super initWithInterceptorManager:dispatchQueue:] for the default implementation to function properly. </p>
</div><h2 class="groupheader">Method Documentation</h2>
<a id="aaab821f901be3d354d9fce8f98a12979"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aaab821f901be3d354d9fce8f98a12979">&#9670;&nbsp;</a></span>cancel</h2>

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          <td class="memname">- (void) cancel </td>
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<p>To cancel the call. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_interceptor_interface-p.html#a89a419fec845010f6f90a3e20aa0debe">&lt;GRPCInterceptorInterface&gt;</a>.</p>

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<a id="a3788cf6d26ec1df66e975bd571280090"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3788cf6d26ec1df66e975bd571280090">&#9670;&nbsp;</a></span>didCloseWithTrailingMetadata:error:</h2>

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          <td class="memname">- (void) didCloseWithTrailingMetadata: </td>
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          <td class="paramtype">(nullable NSDictionary *)&#160;</td>
          <td class="paramname"><em>trailingMetadata</em></td>
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          <td class="paramkey">error:</td>
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          <td class="paramtype">(nullable NSError *)&#160;</td>
          <td class="paramname"><em>error</em>&#160;</td>
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<p>Issued when a call finished. </p>
<p>If the call finished successfully, <code>error</code> is nil and <code>trailingMetadata</code> consists any trailing metadata received from the server. Otherwise, <code>error</code> is non-nil and contains the corresponding error information, including gRPC error codes and error descriptions. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_response_handler-p.html#af69153885066acb9c4431d93dc320049">&lt;GRPCResponseHandler&gt;</a>.</p>

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<a id="ae1a71998631c23254d3667b6de40b487"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae1a71998631c23254d3667b6de40b487">&#9670;&nbsp;</a></span>didReceiveData:</h2>

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          <td class="memname">- (void) didReceiveData: </td>
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          <td class="paramtype">(id)&#160;</td>
          <td class="paramname"><em>data</em></td>
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<p>Issued when gRPC message is received from the server. </p>
<p>The data is always decompressed with gRPC or HTTP compression algorithm specified in the response header. <code>data</code> could be any type as transport layer and interceptors may modify the type of the data (e.g. a Protobuf interceptor may consume NSData typed data and issue GPBMessage typed data to user). Users should interpret <code>data</code> according to the configuration of their calls. Interceptor authors should not assume the type of <code>data</code> unless an agreement is made on how it should be used in a particular call setting. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_response_handler-p.html#a384dd702a37a2fa7db82b8330cfcddcf">&lt;GRPCResponseHandler&gt;</a>.</p>

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<a id="a0a50fe0dc7ce33c82814c4949b8f282a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0a50fe0dc7ce33c82814c4949b8f282a">&#9670;&nbsp;</a></span>didReceiveInitialMetadata:</h2>

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          <td class="memname">- (void) didReceiveInitialMetadata: </td>
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          <td class="paramtype">(nullable NSDictionary *)&#160;</td>
          <td class="paramname"><em>initialMetadata</em></td>
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<p>Issued when initial metadata is received from the server. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_response_handler-p.html#adc82f4ed3ffc8f7c0e91beed9538dbd6">&lt;GRPCResponseHandler&gt;</a>.</p>

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<a id="a4a9d9fbfe49dbe6305ced6cc516da038"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4a9d9fbfe49dbe6305ced6cc516da038">&#9670;&nbsp;</a></span>didWriteData</h2>

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          <td class="memname">- (void) didWriteData </td>
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<p>Issued when flow control is enabled for the call and a message written with GRPCCall2::writeData is passed to gRPC core with SEND_MESSAGE operation. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_response_handler-p.html#a5c5aa4f2f8623e00344ca5e6a3180300">&lt;GRPCResponseHandler&gt;</a>.</p>

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<a id="a53a77a72ebaf711d17e59cb243169032"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a53a77a72ebaf711d17e59cb243169032">&#9670;&nbsp;</a></span>finish</h2>

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          <td class="memname">- (void) finish </td>
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<p>To finish the stream of requests. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_interceptor_interface-p.html#af01872822c9e4adb7c08a51833cde1b7">&lt;GRPCInterceptorInterface&gt;</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a29c874944bed7d25a374e5305649aacc">&#9670;&nbsp;</a></span>initWithInterceptorManager:dispatchQueue:</h2>

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          <td class="memname">- (nullable instancetype) initWithInterceptorManager: </td>
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          <td class="paramtype">(<a class="el" href="interface_g_r_p_c_interceptor_manager.html">GRPCInterceptorManager</a> *)&#160;</td>
          <td class="paramname"><em>interceptorManager</em></td>
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          <td class="paramkey">dispatchQueue:</td>
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          <td class="paramtype">(dispatch_queue_t)&#160;</td>
          <td class="paramname"><em>dispatchQueue</em>&#160;</td>
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<p>Initialize the interceptor with the next interceptor in the chain, and provide the dispatch queue that this interceptor's methods are dispatched onto. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ae5df94d26ea028ec2210deb12f08c416">&#9670;&nbsp;</a></span>NS_UNAVAILABLE <span class="overload">[1/2]</span></h2>

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          <td class="memname">- (instancetype) NS_UNAVAILABLE </td>
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<h2 class="memtitle"><span class="permalink"><a href="#a1e93189dcb502c1f85856f712a384877">&#9670;&nbsp;</a></span>receiveNextMessages:</h2>

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          <td class="memname">- (void) receiveNextMessages: </td>
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<p>To indicate the call that the previous interceptor is ready to receive more messages. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_interceptor_interface-p.html#add7e9df3d4d740fb065ef372ad56046a">&lt;GRPCInterceptorInterface&gt;</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#acede282262511aab39a7dc3b57526aac">&#9670;&nbsp;</a></span>startWithRequestOptions:callOptions:</h2>

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          <td class="memname">- (void) startWithRequestOptions: </td>
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          <td class="paramname"><em>requestOptions</em></td>
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          <td class="paramkey">callOptions:</td>
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          <td class="paramtype">(<a class="el" href="interface_g_r_p_c_call_options.html">GRPCCallOptions</a> *)&#160;</td>
          <td class="paramname"><em>callOptions</em>&#160;</td>
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<p>To start the call. </p>
<p>This method will only be called once for each instance. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_interceptor_interface-p.html#aa7b0ae45db128e5862e2e23f7431185c">&lt;GRPCInterceptorInterface&gt;</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#a6ee64864731acebc4fa4b3ca47a43f36">&#9670;&nbsp;</a></span>writeData:</h2>

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          <td class="memname">- (void) writeData: </td>
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<p>To write data to the call. </p>

<p>Reimplemented from <a class="el" href="protocol_g_r_p_c_interceptor_interface-p.html#afce563b3047786b6525bfe22020fc287">&lt;GRPCInterceptorInterface&gt;</a>.</p>

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<hr/>The documentation for this class was generated from the following file:<ul>
<li>src/objective-c/GRPCClient/<a class="el" href="_g_r_p_c_interceptor_8h_source.html">GRPCInterceptor.h</a></li>
</ul>
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