/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.server.session;
import java.util.Set;
import io.undertow.server.HttpServerExchange;
/**
* Represents a HTTP session.
* <p>
* Many operations provide both a blocking and an asynchronous version.
* <p>
* When using the async versions of operations no guarantee is made as to which threads will
* run listeners registered with this session manger. When using the blocking version the listeners are guaranteed
* to run in the calling thread.
*
* @author Stuart Douglas
*/
public interface Session {
/**
* Returns a string containing the unique identifier assigned
* to this session. The identifier is assigned
* by the servlet container and is implementation dependent.
*
* @return a string specifying the identifier
* assigned to this session
*/
String getId();
/**
* Called when a request is done with the session.
*
* @param serverExchange The http server exchange for this request
*/
void requestDone(final HttpServerExchange serverExchange);
/**
* Returns the time when this session was created, measured
* in milliseconds since midnight January 1, 1970 GMT.
*
* @return a <code>long</code> specifying
* when this session was created,
* expressed in
* milliseconds since 1/1/1970 GMT
* @throws IllegalStateException if this method is called on an
* invalidated session
*/
long getCreationTime();
/**
* Returns the last time the client sent a request associated with
* this session, as the number of milliseconds since midnight
* January 1, 1970 GMT, and marked by the time the container received the request.
* <p>
* <p>Actions that your application takes, such as getting or setting
* a value associated with the session, do not affect the access
* time.
*
* @return a <code>long</code>
* representing the last time
* the client sent a request associated
* with this session, expressed in
* milliseconds since 1/1/1970 GMT
* @throws IllegalStateException if this method is called on an
* invalidated session
*/
long getLastAccessedTime();
/**
* Specifies the time, in seconds, between client requests before the
* servlet container will invalidate this session. A negative time
* indicates the session should never timeout.
*
* @param interval An integer specifying the number
* of seconds
*/
void setMaxInactiveInterval(int interval);
/**
* Returns the maximum time interval, in seconds, that
* the servlet container will keep this session open between
* client accesses. After this interval, the servlet container
* will invalidate the session. The maximum time interval can be set
* with the <code>setMaxInactiveInterval</code> method.
* A negative time indicates the session should never timeout.
*
* @return an integer specifying the number of
* seconds this session remains open
* between client requests
* @see #setMaxInactiveInterval
*/
int getMaxInactiveInterval();
/**
* Returns the object bound with the specified name in this session, or
* <code>null</code> if no object is bound under the name.
*
* @param name a string specifying the name of the object
* @return the object with the specified name
* @throws IllegalStateException if this method is called on an
* invalidated session
*/
Object getAttribute(String name);
/**
* Returns an <code>Set</code> of <code>String</code> objects
* containing the names of all the objects bound to this session.
*
* @return an <code>Set</code> of
* <code>String</code> objects specifying the
* names of all the objects bound to
* this session
* @throws IllegalStateException if this method is called on an
* invalidated session
*/
Set<String> getAttributeNames();
/**
* Binds an object to this session, using the name specified.
* If an object of the same name is already bound to the session,
* the object is replaced.
* <p>
* <p>
* <p>
* <p>If the value passed in is null, this has the same effect as calling
* <code>removeAttribute()</code>.
*
* @param name the name to which the object is bound;
* cannot be null
* @param value the object to be bound
* @return An IOFuture containing the previous value
* @throws IllegalStateException if this method is called on an invalidated session
*/
Object setAttribute(final String name, Object value);
/**
* Removes the object bound with the specified name from
* this session. If the session does not have an object
* bound with the specified name, this method does nothing.
*
* @param name the name of the object to remove from this session
* @throws IllegalStateException if this method is called on an
* invalidated session
*/
Object removeAttribute(final String name);
/**
* Invalidates this session then unbinds any objects bound
* to it.
*
* @throws IllegalStateException if this method is called on an
* already invalidated session
*/
void invalidate(final HttpServerExchange exchange);
/**
* @return The session manager that is associated with this session
*/
SessionManager getSessionManager();
/**
* Generate a new session id for this session, and return the new id.
*
* @return The new session ID
*/
String changeSessionId(final HttpServerExchange exchange, final SessionConfig config);
}