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	<h1 class="page-title">Class: Channel</h1>
<section>

<header>
    
        <h2>
            <span class="ancestors"><a href="grpc.html">grpc</a>.</span>
        
        Channel
        </h2>
        
    
</header>


<article>
    <div class="container-overview">
    
        
<hr>
<dt>
    <h4 class="name" id="Channel"><span class="type-signature"></span>new Channel(target, credentials, options)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>This constructor API is almost identical to the Client constructor,
except that some of the options for the Client constructor are not valid
here.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>target</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
            <td class="description last"><p>The address of the server to connect to</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>credentials</code></td>
            

            <td class="type">
            
                
<span class="param-type">grpc.ChannelCredentials</span>


            </td>

            
            <td class="description last"><p>Channel credentials to use when connecting</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>options</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~ChannelOptions">grpc~ChannelOptions</a></span>


            </td>

            
            <td class="description last"><p>A map of channel options that will be passed to the core.
    The available options are listed in
    <a href="https://grpc.github.io/grpc/core/group__grpc__arg__keys.html">this document</a>.</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


</dd>

    
    </div>

    
        <h3 class="subsection-title">Methods</h3>

        <dl>
            
<hr>
<dt>
    <h4 class="name" id="close"><span class="type-signature"></span>close()</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Close the channel. This has the same functionality as the existing grpc.Client#close</p>
    </div>
    

<dl class="details">
    

</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="createCall"><span class="type-signature"></span>createCall(method, deadline, host, parentCall, propagateFlags)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Create a call object. Call is an opaque type used by the <a href="grpc.Client.html">grpc.Client</a>
and <a href="grpc.Server.html">grpc.Server</a> classes. This function is called by the gRPC library
when starting a request. Implementers should return an instance of Call that
is returned from calling createCall on an instance of the provided Channel
class.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>method</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>


            </td>

            
            <td class="description last"><p>The full method string to request</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>deadline</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~Deadline">grpc~Deadline</a></span>


            </td>

            
            <td class="description last"><p>The call deadline</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>host</code></td>
            

            <td class="type">
            
                
<span class="param-type">string</span>
|

<span class="param-type">null</span>


            </td>

            
            <td class="description last"><p>A host string override for making the request</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>parentCall</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc-Call.html">grpc~Call</a></span>
|

<span class="param-type">null</span>


            </td>

            
            <td class="description last"><p>A server call to propagate some
    information from</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>propagateFlags</code></td>
            

            <td class="type">
            
                
<span class="param-type">number</span>
|

<span class="param-type">null</span>


            </td>

            
            <td class="description last"><p>A bitwise combination of elements of
    <a href="grpc.html#.propagate">grpc.propagate</a> that indicates what information to propagate
    from parentCall</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc-Call.html">grpc~Call</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="getConnectivityState"><span class="type-signature"></span>getConnectivityState(tryToConnect)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Get the channel's current connectivity state.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>tryToConnect</code></td>
            

            <td class="type">
            
                
<span class="param-type">boolean</span>


            </td>

            
            <td class="description last"><p>If true, the channel will start connecting if it is
    idle. Otherwise, idle channels will only start connecting when a
    call starts.</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>The current connectivity state</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type"><a href="grpc.html#.connectivityState">grpc.connectivityState</a></span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="getTarget"><span class="type-signature"></span>getTarget()</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Return the target that this channel connects to</p>
    </div>
    

<dl class="details">
    

</dl>


    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <p>The target</p>
</div>


<dl>
    <dt>
        Type
    </dt>
    <dd>
        
<span class="param-type">string</span>


    </dd>
</dl>


</dd>

        
<hr>
<dt>
    <h4 class="name" id="watchConnectivityState"><span class="type-signature"></span>watchConnectivityState(currentState, deadline, callback)</h4>
    
    
</dt>
<dd>

    
    <div class="description">
        <p>Watch for connectivity state changes.</p>
    </div>
    

        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>currentState</code></td>
            

            <td class="type">
            
                
<span class="param-type">grpc.ConnectivityState</span>


            </td>

            
            <td class="description last"><p>The state to watch for
    transitions from. This should always be populated by calling
    getConnectivityState immediately before.</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>deadline</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.html#~Deadline">grpc~Deadline</a></span>


            </td>

            
            <td class="description last"><p>A deadline for waiting for a state change</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>callback</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="grpc.Channel.html#~watchConnectivityStateCallback">grpc.Channel~watchConnectivityStateCallback</a></span>


            </td>

            
            <td class="description last"><p>Called with no
    error when the state changes, or with an error if the deadline passes
    without a state change</p></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


</dd>

        </dl>
    

        <h3 class="subsection-title">Type Definitions</h3>

        <dl>
                
<hr>
<dt>
    <h4 class="name" id="~watchConnectivityStateCallback"><span class="type-signature"></span>watchConnectivityStateCallback(error)</h4>
    
    
</dt>
<dd>

    
        <h5>Parameters:</h5>
        

<table class="params table table-striped">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Argument</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>error</code></td>
            

            <td class="type">
            
                
<span class="param-type">Error</span>


            </td>

            
                <td class="attributes">
                

                    &lt;nullable><br>
                

                </td>
            

            <td class="description last"></td>
        </tr>

    
    </tbody>
</table>

    
<dl class="details">
    

</dl>


</dd>

            </dl>
    

</article>

</section>


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