javax.servlet.http.PushBuilder Maven / Gradle / Ivy
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package javax.servlet.http;
import java.util.Set;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/** Build a request to be pushed.
*
* A PushBuilder is obtained by calling {@link
* HttpServletRequest#getPushBuilder()}. Each call to this method will
* return a new instance of a PushBuilder based off the current {@code
* HttpServletRequest}. Any mutations to the returned PushBuilder are
* not reflected on future returns.
*
* The instance is initialized as follows:
*
*
*
* - The method is initialized to "GET"
*
* - The existing headers of the current {@link HttpServletRequest}
* are added to the builder, except for:
*
*
* - Conditional headers (eg. If-Modified-Since)
*
- Range headers
*
- Expect headers
*
- Authorization headers
*
- Referrer headers
*
*
*
*
* - If the request was authenticated, an Authorization header will
* be set with a container generated token that will result in equivalent
* Authorization for the pushed request.
*
* - The {@link HttpServletRequest#getRequestedSessionId()} value,
* unless at the time of the call {@link
* HttpServletRequest#getSession(boolean)} has previously been called to
* create a new {@link HttpSession}, in which case the new session ID
* will be used as the PushBuilder's requested session ID. The source of
* the requested session id will be the same as for the request
*
* - The Referer(sic) header will be set to {@link
* HttpServletRequest#getRequestURL()} plus any {@link
* HttpServletRequest#getQueryString()}
*
* - If {@link HttpServletResponse#addCookie(Cookie)} has been called
* on the associated response, then a corresponding Cookie header will be added
* to the PushBuilder, unless the {@link Cookie#getMaxAge()} is <=0, in which
* case the Cookie will be removed from the builder.
*
* - If this request has has the conditional headers If-Modified-Since
* or If-None-Match, then the {@link #isConditional()} header is set to
* true.
*
*
*
* The {@link #path} method must be called on the {@code PushBuilder}
* instance before the call to {@link #push}. Failure to do so must
* cause an exception to be thrown from {@link
* #push}, as specified in that method.
*
* A PushBuilder can be customized by chained calls to mutator
* methods before the {@link #push()} method is called to initiate an
* asynchronous push request with the current state of the builder.
* After the call to {@link #push()}, the builder may be reused for
* another push, however the implementation must make it so the {@link
* #path(String)}, {@link #eTag(String)} and {@link
* #lastModified(String)} values are cleared before returning from
* {@link #push}. All other values are retained over calls to {@link
* #push()}.
*
* @since Servlet 4.0
*/
public interface PushBuilder
{
/**
*
Set the method to be used for the push.
*
* Any non-empty String may be used for the method.
*
* @throws NullPointerException if the argument is {@code null}
*
* @throws IllegalArgumentException if the argument is the empty String
*
* @param method the method to be used for the push.
* @return this builder.
*/
public abstract PushBuilder method(String method);
/** Set the query string to be used for the push.
*
* Will be appended to any query String included in a call to {@link
* #path(String)}. Any duplicate parameters must be preserved. This
* method should be used instead of a query in {@link #path(String)}
* when multiple {@link #push()} calls are to be made with the same
* query string.
* @param queryString the query string to be used for the push.
* @return this builder.
*/
public abstract PushBuilder queryString(String queryString);
/** Set the SessionID to be used for the push.
* The session ID will be set in the same way it was on the associated request (ie
* as a cookie if the associated request used a cookie, or as a url parameter if
* the associated request used a url parameter).
* Defaults to the requested session ID or any newly assigned session id from
* a newly created session.
* @param sessionId the SessionID to be used for the push.
* @return this builder.
*/
public abstract PushBuilder sessionId(String sessionId);
/** Set if the request is to be conditional.
* If the request is conditional, any available values from {@link #eTag(String)} or
* {@link #lastModified(String)} will be set in the appropriate headers. If the request
* is not conditional, then eTag and lastModified values are ignored.
* Defaults to true if the associated request was conditional.
* @param conditional true if the push request is conditional
* @return this builder.
*/
public abstract PushBuilder conditional(boolean conditional);
/**
* Set a header to be used for the push. If the builder has an
* existing header with the same name, its value is overwritten.
*
* @param name The header name to set
* @param value The header value to set
* @return this builder.
*/
public abstract PushBuilder setHeader(String name, String value);
/**
* Add a header to be used for the push.
* @param name The header name to add
* @param value The header value to add
* @return this builder.
*/
public abstract PushBuilder addHeader(String name, String value);
/**
* Remove the named header. If the header does not exist, take
* no action.
*
* @param name The name of the header to remove
* @return this builder.
*/
public abstract PushBuilder removeHeader(String name);
/**
* Set the URI path to be used for the push. The path may start
* with "/" in which case it is treated as an absolute path,
* otherwise it is relative to the context path of the associated
* request. There is no path default and {@link #path(String)} must
* be called before every call to {@link #push()}. If a query
* string is present in the argument {@code path}, its contents must
* be merged with the contents previously passed to {@link
* #queryString}, preserving duplicates.
*
* @param path the URI path to be used for the push, which may include a
* query string.
* @return this builder.
*/
public abstract PushBuilder path(String path);
/**
* Set the eTag to be used for conditional pushes.
* The eTag will be used only if {@link #isConditional()} is true.
* Defaults to no eTag. The value is nulled after every call to
* {@link #push()}
* @param eTag the eTag to be used for the push.
* @return this builder.
*/
public abstract PushBuilder eTag(String eTag);
/**
* Set the last modified date to be used for conditional pushes.
* The last modified date will be used only if {@link
* #isConditional()} is true. Defaults to no date. The value is
* nulled after every call to {@link #push()}
* @param lastModified the last modified date to be used for the push.
* @return this builder.
* */
public abstract PushBuilder lastModified(String lastModified);
/** Push a resource given the current state of the builder,
* returning immediately without blocking.
* Push a resource based on the current state of the PushBuilder.
* Calling this method does not guarantee the resource will actually
* be pushed, since it is possible the client can decline acceptance
* of the pushed resource using the underlying HTTP/2 protocol.
* If {@link #isConditional()} is true and an eTag or
* lastModified value is provided, then an appropriate conditional
* header will be generated. If both an eTag and lastModified value
* are provided only an If-None-Match header will be generated. If
* the builder has a session ID, then the pushed request will
* include the session ID either as a Cookie or as a URI parameter
* as appropriate. The builders query string is merged with any
* passed query string.
* Before returning from this method, the builder has its path,
* eTag and lastModified fields nulled. All other fields are left as
* is for possible reuse in another push.
*
* @throws IllegalArgumentException if the method set expects a
* request body (eg POST)
*
* @throws IllegalStateException if there was no call to {@link
* #path} on this instance either between its instantiation or the
* last call to {@code push()} that did not throw an
* IllegalStateException.
*/
public abstract void push();
public abstract String getMethod();
public abstract String getQueryString();
public abstract String getSessionId();
public abstract boolean isConditional();
public abstract Set getHeaderNames();
public abstract String getHeader(String name);
public abstract String getPath();
public abstract String getETag();
public abstract String getLastModified();
}