org.osgi.service.http.HttpService Maven / Gradle / Ivy
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/*
* Copyright (c) OSGi Alliance (2000, 2013). All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.osgi.service.http;
import java.util.Dictionary;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
/**
* The Http Service allows other bundles in the OSGi environment to dynamically
* register resources and servlets into the URI namespace of Http Service. A
* bundle may later unregister its resources or servlets.
*
* @noimplement
* @author $Id: c7dcd5824096b8a0d98ffe6a0b7b9de336e864f6 $
* @see HttpContext
*/
public interface HttpService {
/**
* Registers a servlet into the URI namespace.
*
*
* The alias is the name in the URI namespace of the Http Service at which
* the registration will be mapped.
*
*
* An alias must begin with slash ('/') and must not end with slash ('/'),
* with the exception that an alias of the form "/" is used to
* denote the root alias. See the specification text for details on how HTTP
* requests are mapped to servlet and resource registrations.
*
*
* The Http Service will call the servlet's {@code init} method before
* returning.
*
*
* httpService.registerServlet("/myservlet", servlet, initparams, context);
*
*
*
* Servlets registered with the same {@code HttpContext} object will share
* the same {@code ServletContext}. The Http Service will call the
* {@code context} argument to support the {@code ServletContext} methods
* {@code getResource},{@code getResourceAsStream} and {@code getMimeType},
* and to handle security for requests. If the {@code context} argument is
* {@code null}, a default {@code HttpContext} object is used (see
* {@link #createDefaultHttpContext()}).
*
* @param alias name in the URI namespace at which the servlet is registered
* @param servlet the servlet object to register
* @param initparams initialization arguments for the servlet or
* {@code null} if there are none. This argument is used by the
* servlet's {@code ServletConfig} object.
* @param context the {@code HttpContext} object for the registered servlet,
* or {@code null} if a default {@code HttpContext} is to be created
* and used.
* @throws NamespaceException if the registration fails because the alias is
* already in use.
* @throws javax.servlet.ServletException if the servlet's {@code init}
* method throws an exception, or the given servlet object has
* already been registered at a different alias.
* @throws java.lang.IllegalArgumentException if any of the arguments are
* invalid
*/
public void registerServlet(String alias, Servlet servlet, Dictionary initparams, HttpContext context) throws ServletException, NamespaceException;
/**
* Registers resources into the URI namespace.
*
*
* The alias is the name in the URI namespace of the Http Service at which
* the registration will be mapped. An alias must begin with slash ('/') and
* must not end with slash ('/'), with the exception that an alias of the
* form "/" is used to denote the root alias. The name parameter
* must also not end with slash ('/') with the exception that a name of the
* form "/" is used to denote the root of the bundle. See the
* specification text for details on how HTTP requests are mapped to servlet
* and resource registrations.
*
* For example, suppose the resource name /tmp is registered to the alias
* /files. A request for /files/foo.txt will map to the resource name
* /tmp/foo.txt.
*
*
* httpservice.registerResources("/files", "/tmp", context);
*
*
* The Http Service will call the {@code HttpContext} argument to map
* resource names to URLs and MIME types and to handle security for
* requests. If the {@code HttpContext} argument is {@code null}, a default
* {@code HttpContext} is used (see {@link #createDefaultHttpContext()}).
*
* @param alias name in the URI namespace at which the resources are
* registered
* @param name the base name of the resources that will be registered
* @param context the {@code HttpContext} object for the registered
* resources, or {@code null} if a default {@code HttpContext} is to
* be created and used.
* @throws NamespaceException if the registration fails because the alias is
* already in use.
* @throws java.lang.IllegalArgumentException if any of the parameters are
* invalid
*/
public void registerResources(String alias, String name, HttpContext context) throws NamespaceException;
/**
* Unregisters a previous registration done by {@code registerServlet} or
* {@code registerResources} methods.
*
*
* After this call, the registered alias in the URI name-space will no
* longer be available. If the registration was for a servlet, the Http
* Service must call the {@code destroy} method of the servlet before
* returning.
*
* If the bundle which performed the registration is stopped or otherwise
* "unget"s the Http Service without calling {@link #unregister(String)}
* then Http Service must automatically unregister the registration.
* However, if the registration was for a servlet, the {@code destroy}
* method of the servlet will not be called in this case since the bundle
* may be stopped. {@link #unregister(String)} must be explicitly called to
* cause the {@code destroy} method of the servlet to be called. This can be
* done in the {@code BundleActivator.stop} method of the bundle registering
* the servlet.
*
* @param alias name in the URI name-space of the registration to unregister
* @throws java.lang.IllegalArgumentException if there is no registration
* for the alias or the calling bundle was not the bundle which
* registered the alias.
*/
public void unregister(String alias);
/**
* Creates a default {@code HttpContext} for registering servlets or
* resources with the HttpService, a new {@code HttpContext} object is
* created each time this method is called.
*
*
* The behavior of the methods on the default {@code HttpContext} is defined
* as follows:
*
* - {@code getMimeType} - Does not define any customized MIME types for
* the Content-Type header in the response, and always returns {@code null}.
*
* - {@code handleSecurity} - Performs implementation-defined
* authentication on the request.
* - {@code getResource} - Assumes the named resource is in the context
* bundle; this method calls the context bundle's {@code Bundle.getResource}
* method, and returns the appropriate URL to access the resource. On a Java
* runtime environment that supports permissions, the Http Service needs to
* be granted {@code org.osgi.framework.AdminPermission[*,RESOURCE]}.
*
*
* @return a default {@code HttpContext} object.
* @since 1.1
*/
public HttpContext createDefaultHttpContext();
}