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/*
* Copyright (c) 2013, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.server;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.ws.rs.core.Configuration;
/**
* Meta-annotation that provides a facility for creating bindings between an {@link Uri @Uri}-injectable
* {@link javax.ws.rs.client.WebTarget WebTarget} instances and clients (and their configurations) that are used to create
* the injected web target instances.
*
* Jersey refers to client instance configured using custom bound configurations as managed clients. As a first step,
* when using a managed client in a server-side JAX-RS/Jersey application, a custom client binding annotation has to be
* defined:
*
* @ClientBinding
* public @interface MyClient { }
*
* This defines new {@code @MyClient} binding annotation which will be configured using a default {@link #configClass()
* configuration class}, will {@link #inheritServerProviders() inherit all server-side providers} as well as will use a
* default {@link #baseUri() base URI} to resolve relative {@link Uri @Uri} web target URI values.
*
*
* Once a custom client binding annotation is defined, it can be used when {@link Uri injecting} new
* {@code WebTarget} instances created by a managed client. To complete a binding between a manged client and an injected
* web target instance, put the custom client binding annotation into the definition of an injected web target field or
* parameter. For example:
*
* @Path("foo")
* public class ManagedClientResource {
* @Uri("bar") @MyClient
* private WebTarget targetBar;
*
* @GET
* @Path("bar")
* public String getBar() {
* return targetBar.request(MediaType.TEXT_PLAIN).get(String.class);
* }
*
* @GET
* @Path("baz")
* public Response getBaz(@Uri("baz") @MyClient WebTarget targetBaz) {
* return targetB.request(MediaType.TEXT_PLAIN).get();
* }
* }
*
*
*
* Often managed clients may require a more complex configuration, including specifying custom provider classes and instances
* and setting custom properties. In such case it may be more convenient to provide a custom {@link Configuration}
* implementation class and link it with the binding annotation:
*
* public class MyClientConfig implements Configuration {
* ... // configure provide
* }
*
* @ClientBinding(configClass = MyClientConfig.class)
* public @interface MyClient { }
*
* Note that the easiest way how to provide a custom client-side {@code Configuration} implementation in Jersey is to extend
* the {@link org.glassfish.jersey.client.ClientConfig} class that provides reusable implementation of JAX-RS
* {@link Configuration} as well as {@link javax.ws.rs.core.Configurable Configurable} APIs.
*
*
* In case a managed client needs special properties, these properties can also be provided via custom {@code Configuration}
* implementation class. Another way how to pass custom properties to a managed client configuration is to define the managed
* client properties in the server configuration using a special
* <client.binding.annotation.FQN>.property. prefix. This can be either done programmatically,
* for example:
*
* MyResourceConfig.property(
* "my.package.MyClient.property.custom-client-property", "custom-value");
*
*
*
* Or declaratively via {@code web.xml}:
*
* <init-param>
* <param-name>my.package.MyClient.property.custom-client-property</param-name>
* <param-value>custom-value</param-value>
* </init-param>
*
* Properties defined this way can be accessed from the proper managed client instances using the custom property names:
*
* Object value = customTarget.getConfiguration().getProperty("custom-client-property");
*
* Note that the technique of defining managed client properties via server-side configuration described above can be also used
* to override the default property values defined programmatically in a custom configuration implementation class.
*
*
* @author Marek Potociar
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.ANNOTATION_TYPE)
@Documented
public @interface ClientBinding {
/**
* Define a configuration implementation class to be instantiated and used to configure bound web targets.
* If not set, a default client-side configuration implementation class will be used.
*
* Hard-coded value of this property may be overridden at deploy-time by providing a new value for a
* <client.binding.annotation.FQN>.configClass property.
*
*
* For example:
*
* MyResourceConfig.property(
* "my.package.MyClient.configClass",
* "my.package.MyClientConfig");
*
*
*
* Or declaratively via {@code web.xml}:
*
* <init-param>
* <param-name>my.package.MyClient.configClass</param-name>
* <param-value>my.package.MyClientConfig</param-value>
* </init-param>
*
*
*/
public Class configClass() default Configuration.class;
/**
* Determine whether providers present in the server-side configuration should be inherited by the bound client
* configuration ({@code true}) or not ({@code false}). By default the server-side providers are inherited, i.e.
* the annotation property defaults to {@code true}.
*
* Hard-coded value of this property may be overridden at deploy-time by providing a new value for a
* <client.binding.annotation.FQN>.inheritServerProviders property.
*
*
* For example:
*
* MyResourceConfig.property(
* "my.package.MyClient.inheritServerProviders", false);
*
*
*
* Or declaratively via {@code web.xml}:
*
* <init-param>
* <param-name>my.package.MyClient.inheritServerProviders</param-name>
* <param-value>false</param-value>
* </init-param>
*
*
*/
public boolean inheritServerProviders() default true;
/**
* Define a custom base URI for managed {@link javax.ws.rs.client.WebTarget WebTarget} instances injected using
* {@link Uri @Uri} annotation with a relative web target URI value. By default, the base
* URI is empty indicating that the current application base URI should be used.
*
* Using a custom context root is useful in cases where the absolute URI of the target endpoint(s) is expected
* to change on may vary over time. An typical scenarios include transition of the application from a test to
* production environment, etc.
*
*
* Hard-coded value of this property may be overridden at deploy-time by providing a new value for a
* <client.binding.annotation.FQN>.baseUri property.
*
*
* For example:
*
* MyResourceConfig.property(
* "my.package.MyClient.baseUri", "http://jersey.java.net/examples/");
*
*
*
* Or declaratively via {@code web.xml}:
*
* <init-param>
* <param-name>my.package.MyClient.baseUri</param-name>
* <param-value>http://jersey.java.net/examples/</param-value>
* </init-param>
*
*
*/
public String baseUri() default "";
}