apidocs/2.1.6/javax/ws/rs/client/package-summary.html - third_party/jakartaee/rest - Git at Google

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 <div class="block"><h1>The Client API</h1>

  The Client API is a Java based API used to access Web resources.
  It is not restricted to resources implemented using this API.
  It provides a higher-level abstraction compared to a <a href="https://docs.oracle.com/javase/8/docs/api/java/net/HttpURLConnection.html?is-external=true" title="class or interface in java.net" class="externalLink"><code>plain HTTP communication API</code></a> as well as integration with extension
  providers, in order to enable concise and efficient implementation of
  reusable client-side solutions that leverage existing and well
  established client-side implementations of HTTP-based communication.
  <p/>
  The Client API encapsulates the Uniform Interface Constraint &ndash;
  a key constraint of the REST architectural style &ndash; and associated data
  elements as client-side Java artifacts and supports a pluggable architecture
  by defining multiple extension points.

  <h2>Client API Bootstrapping and Configuration</h2>
  The main entry point to the API is a <a href="ClientBuilder.html" title="class in javax.ws.rs.client"><code>ClientBuilder</code></a>
  that is used to bootstrap <a href="Client.html" title="interface in javax.ws.rs.client"><code>Client</code></a> instances -
  <a href="../core/Configurable.html" title="interface in javax.ws.rs.core"><code>configurable</code></a>, heavy-weight objects
  that manage the underlying communication infrastructure and serve as the root
  objects for accessing any Web resource. The following example illustrates the
  bootstrapping and configuration of a <code>Client</code> instance:
  <pre>
    Client client = ClientBuilder.newClient();

    client.property("MyProperty", "MyValue")
          .register(MyProvider.class)
          .register(MyFeature.class);
  </pre>

  <h2>Accessing Web Resources</h2>
  A Web resource can be accessed using a fluent API in which method invocations
  are chained to configure and ultimately submit an HTTP request. The following
  example gets a <code>text/plain</code> representation of the resource identified by
  <code>"http://example.org/hello"</code>:
  <pre>
    Client client = ClientBuilder.newClient();
    Response res = client.target("http://example.org/hello").request("text/plain").get();
  </pre>
  Conceptually, the steps required to submit a request are the following:
  <ol>
    <li>obtain an <a href="Client.html" title="interface in javax.ws.rs.client"><code>Client</code></a> instance</li>
    <li>create a <a href="WebTarget.html" title="interface in javax.ws.rs.client"><code>WebTarget</code></a> pointing at a Web resource</li>
    <li><a href="Invocation.Builder.html" title="interface in javax.ws.rs.client"><code>build</code></a> a request</li>
    <li>submit a request to directly retrieve a response or get a prepared
        <a href="Invocation.html" title="interface in javax.ws.rs.client"><code>Invocation</code></a> for later submission</li>
  </ol>

  As illustrated above, individual Web resources are in the Client API
  represented as resource targets. Each <code>WebTarget</code> instance is bound to a
  concrete URI, e.g. <code>"http://example.org/messages/123"</code>,
  or a URI template, e.g. <code>"http://example.org/messages/{id}"</code>.
  That way a single target can either point at a particular resource or represent
  a larger group of resources (that e.g. share a common configuration) from which
  concrete resources can be later derived:
  <pre>
    // Parent target for all messages
    WebTarget messages = client.target("http://example.org/messages/{id}");

    // New target for http://example.org/messages/123
    WebTarget msg123 = messages.resolveTemplate("id", 123);

    // New target for http://example.org/messages/456
    WebTarget msg456 = messages.resolveTemplate("id", 456);
  </pre>

 <h2>Generic Invocations</h2>
  An <a href="Invocation.html" title="interface in javax.ws.rs.client"><code>Invocation</code></a> is a request that has been prepared
  and is ready for execution.
  Invocations provide a generic interface that enables a separation of concerns
  between the creator and the submitter. In particular, the submitter does not
  need to know how the invocation was prepared, but only whether it should be
  executed synchronously or asynchronously.
  <pre>
    Invocation inv1 = client.target("http://example.org/atm/balance")
        .queryParam("card", "111122223333").queryParam("pin", "9876")
        .request("text/plain").buildGet();
    Invocation inv2 = client.target("http://example.org/atm/withdrawal")
        .queryParam("card", "111122223333").queryParam("pin", "9876")
        .request().buildPost(text("50.0")));

    Collection<Invocation> invs = Arrays.asList(inv1, inv2);
    // Executed by the submitter
    Collection<Response> ress = Collections.transform(invs, new F<Invocation, Response>() {
       public Response apply(Invocation inv) {return inv.invoke(); }
    });
  </pre></div>
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 <th class="colFirst" scope="col">Interface</th>
 <th class="colLast" scope="col">Description</th>
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 <tbody>
 <tr class="altColor">
 <th class="colFirst" scope="row"><a href="AsyncInvoker.html" title="interface in javax.ws.rs.client">AsyncInvoker</a></th>
 <td class="colLast">
 <div class="block">Uniform interface for asynchronous invocation of HTTP methods.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colFirst" scope="row"><a href="Client.html" title="interface in javax.ws.rs.client">Client</a></th>
 <td class="colLast">
 <div class="block">Client is the main entry point to the fluent API used to build and execute client
  requests in order to consume responses returned.</div>
 </td>
 </tr>
 <tr class="altColor">
 <th class="colFirst" scope="row"><a href="ClientRequestContext.html" title="interface in javax.ws.rs.client">ClientRequestContext</a></th>
 <td class="colLast">
 <div class="block">Client request filter context.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colFirst" scope="row"><a href="ClientRequestFilter.html" title="interface in javax.ws.rs.client">ClientRequestFilter</a></th>
 <td class="colLast">
 <div class="block">An extension interface implemented by client request filters.</div>
 </td>
 </tr>
 <tr class="altColor">
 <th class="colFirst" scope="row"><a href="ClientResponseContext.html" title="interface in javax.ws.rs.client">ClientResponseContext</a></th>
 <td class="colLast">
 <div class="block">Client response filter context.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colFirst" scope="row"><a href="ClientResponseFilter.html" title="interface in javax.ws.rs.client">ClientResponseFilter</a></th>
 <td class="colLast">
 <div class="block">An extension interface implemented by client response filters.</div>
 </td>
 </tr>
 <tr class="altColor">
 <th class="colFirst" scope="row"><a href="CompletionStageRxInvoker.html" title="interface in javax.ws.rs.client">CompletionStageRxInvoker</a></th>
 <td class="colLast">
 <div class="block">Reactive invoker based <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink"><code>CompletionStage</code></a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colFirst" scope="row"><a href="Invocation.html" title="interface in javax.ws.rs.client">Invocation</a></th>
 <td class="colLast">
 <div class="block">A client request invocation.</div>
 </td>
 </tr>
 <tr class="altColor">
 <th class="colFirst" scope="row"><a href="Invocation.Builder.html" title="interface in javax.ws.rs.client">Invocation.Builder</a></th>
 <td class="colLast">
 <div class="block">A client request invocation builder.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colFirst" scope="row"><a href="InvocationCallback.html" title="interface in javax.ws.rs.client">InvocationCallback</a>&lt;RESPONSE&gt;</th>
 <td class="colLast">
 <div class="block">Callback that can be implemented to receive the asynchronous processing
  events from the invocation processing.</div>
 </td>
 </tr>
 <tr class="altColor">
 <th class="colFirst" scope="row"><a href="RxInvoker.html" title="interface in javax.ws.rs.client">RxInvoker</a>&lt;T&gt;</th>
 <td class="colLast">
 <div class="block">Uniform interface for reactive invocation of HTTP methods.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colFirst" scope="row"><a href="RxInvokerProvider.html" title="interface in javax.ws.rs.client">RxInvokerProvider</a>&lt;T extends <a href="RxInvoker.html" title="interface in javax.ws.rs.client">RxInvoker</a>&gt;</th>
 <td class="colLast">
 <div class="block"><a href="RxInvoker.html" title="interface in javax.ws.rs.client"><code>RxInvoker</code></a> provider.</div>
 </td>
 </tr>
 <tr class="altColor">
 <th class="colFirst" scope="row"><a href="SyncInvoker.html" title="interface in javax.ws.rs.client">SyncInvoker</a></th>
 <td class="colLast">
 <div class="block">Uniform interface for synchronous invocation of HTTP methods.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colFirst" scope="row"><a href="WebTarget.html" title="interface in javax.ws.rs.client">WebTarget</a></th>
 <td class="colLast">
 <div class="block">A resource target identified by the resource URI.</div>
 </td>
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 <caption><span>Class Summary</span><span class="tabEnd">&nbsp;</span></caption>
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 <th class="colFirst" scope="col">Class</th>
 <th class="colLast" scope="col">Description</th>
 </tr>
 <tbody>
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 <th class="colFirst" scope="row"><a href="ClientBuilder.html" title="class in javax.ws.rs.client">ClientBuilder</a></th>
 <td class="colLast">
 <div class="block">Main entry point to the client API used to bootstrap <a href="Client.html" title="interface in javax.ws.rs.client"><code>Client</code></a>
  instances.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colFirst" scope="row"><a href="Entity.html" title="class in javax.ws.rs.client">Entity</a>&lt;T&gt;</th>
 <td class="colLast">
 <div class="block">Encapsulates message entity including the associated variant information.</div>
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 <th class="colFirst" scope="col">Exception</th>
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 <th class="colFirst" scope="row"><a href="ResponseProcessingException.html" title="class in javax.ws.rs.client">ResponseProcessingException</a></th>
 <td class="colLast">
 <div class="block">Client-side runtime processing exception thrown to indicate that
  response processing has failed (e.g.</div>
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	<h1 title="Package" class="title">Package javax.ws.rs.client</h1>
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	</a>
	<div class="block"><h1>The Client API</h1>

	The Client API is a Java based API used to access Web resources.
	It is not restricted to resources implemented using this API.
	It provides a higher-level abstraction compared to a <a href="https://docs.oracle.com/javase/8/docs/api/java/net/HttpURLConnection.html?is-external=true" title="class or interface in java.net" class="externalLink"><code>plain HTTP communication API</code></a> as well as integration with extension
	providers, in order to enable concise and efficient implementation of
	reusable client-side solutions that leverage existing and well
	established client-side implementations of HTTP-based communication.
	<p/>
	The Client API encapsulates the Uniform Interface Constraint –
	a key constraint of the REST architectural style – and associated data
	elements as client-side Java artifacts and supports a pluggable architecture
	by defining multiple extension points.

	<h2>Client API Bootstrapping and Configuration</h2>
	The main entry point to the API is a <a href="ClientBuilder.html" title="class in javax.ws.rs.client"><code>ClientBuilder</code></a>
	that is used to bootstrap <a href="Client.html" title="interface in javax.ws.rs.client"><code>Client</code></a> instances -
	<a href="../core/Configurable.html" title="interface in javax.ws.rs.core"><code>configurable</code></a>, heavy-weight objects
	that manage the underlying communication infrastructure and serve as the root
	objects for accessing any Web resource. The following example illustrates the
	bootstrapping and configuration of a <code>Client</code> instance:
	<pre>
	Client client = ClientBuilder.newClient();

	client.property("MyProperty", "MyValue")
	.register(MyProvider.class)
	.register(MyFeature.class);
	</pre>

	<h2>Accessing Web Resources</h2>
	A Web resource can be accessed using a fluent API in which method invocations
	are chained to configure and ultimately submit an HTTP request. The following
	example gets a <code>text/plain</code> representation of the resource identified by
	<code>"http://example.org/hello"</code>:
	<pre>
	Client client = ClientBuilder.newClient();
	Response res = client.target("http://example.org/hello").request("text/plain").get();
	</pre>
	Conceptually, the steps required to submit a request are the following:
	<ol>
	<li>obtain an <a href="Client.html" title="interface in javax.ws.rs.client"><code>Client</code></a> instance</li>
	<li>create a <a href="WebTarget.html" title="interface in javax.ws.rs.client"><code>WebTarget</code></a> pointing at a Web resource</li>
	<li><a href="Invocation.Builder.html" title="interface in javax.ws.rs.client"><code>build</code></a> a request</li>
	<li>submit a request to directly retrieve a response or get a prepared
	<a href="Invocation.html" title="interface in javax.ws.rs.client"><code>Invocation</code></a> for later submission</li>
	</ol>

	As illustrated above, individual Web resources are in the Client API
	represented as resource targets. Each <code>WebTarget</code> instance is bound to a
	concrete URI, e.g. <code>"http://example.org/messages/123"</code>,
	or a URI template, e.g. <code>"http://example.org/messages/{id}"</code>.
	That way a single target can either point at a particular resource or represent
	a larger group of resources (that e.g. share a common configuration) from which
	concrete resources can be later derived:
	<pre>
	// Parent target for all messages
	WebTarget messages = client.target("http://example.org/messages/{id}");

	// New target for http://example.org/messages/123
	WebTarget msg123 = messages.resolveTemplate("id", 123);

	// New target for http://example.org/messages/456
	WebTarget msg456 = messages.resolveTemplate("id", 456);
	</pre>

	<h2>Generic Invocations</h2>
	An <a href="Invocation.html" title="interface in javax.ws.rs.client"><code>Invocation</code></a> is a request that has been prepared
	and is ready for execution.
	Invocations provide a generic interface that enables a separation of concerns
	between the creator and the submitter. In particular, the submitter does not
	need to know how the invocation was prepared, but only whether it should be
	executed synchronously or asynchronously.
	<pre>
	Invocation inv1 = client.target("http://example.org/atm/balance")
	.queryParam("card", "111122223333").queryParam("pin", "9876")
	.request("text/plain").buildGet();
	Invocation inv2 = client.target("http://example.org/atm/withdrawal")
	.queryParam("card", "111122223333").queryParam("pin", "9876")
	.request().buildPost(text("50.0")));

	Collection<Invocation> invs = Arrays.asList(inv1, inv2);
	// Executed by the submitter
	Collection<Response> ress = Collections.transform(invs, new F<Invocation, Response>() {
	public Response apply(Invocation inv) {return inv.invoke(); }
	});
	</pre></div>
	</section>
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	<table>
	<caption><span>Interface Summary</span><span class="tabEnd"> </span></caption>
	<tr>
	<th class="colFirst" scope="col">Interface</th>
	<th class="colLast" scope="col">Description</th>
	</tr>
	<tbody>
	<tr class="altColor">
	<th class="colFirst" scope="row"><a href="AsyncInvoker.html" title="interface in javax.ws.rs.client">AsyncInvoker</a></th>
	<td class="colLast">
	<div class="block">Uniform interface for asynchronous invocation of HTTP methods.</div>
	</td>
	</tr>
	<tr class="rowColor">
	<th class="colFirst" scope="row"><a href="Client.html" title="interface in javax.ws.rs.client">Client</a></th>
	<td class="colLast">
	<div class="block">Client is the main entry point to the fluent API used to build and execute client
	requests in order to consume responses returned.</div>
	</td>
	</tr>
	<tr class="altColor">
	<th class="colFirst" scope="row"><a href="ClientRequestContext.html" title="interface in javax.ws.rs.client">ClientRequestContext</a></th>
	<td class="colLast">
	<div class="block">Client request filter context.</div>
	</td>
	</tr>
	<tr class="rowColor">
	<th class="colFirst" scope="row"><a href="ClientRequestFilter.html" title="interface in javax.ws.rs.client">ClientRequestFilter</a></th>
	<td class="colLast">
	<div class="block">An extension interface implemented by client request filters.</div>
	</td>
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