/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.catalina;
/** * A <b>Manager</b> manages the pool of Sessions that are associated with a * particular Context. Different Manager implementations may support * value-added features such as the persistent storage of session data, * as well as migrating sessions for distributable web applications. * <p> * In order for a <code>Manager</code> implementation to successfully operate * with a <code>Context</code> implementation that implements reloading, it * must obey the following constraints: * <ul> * <li>Must implement <code>Lifecycle</code> so that the Context can indicate * that a restart is required. * <li>Must allow a call to <code>stop()</code> to be followed by a call to * <code>start()</code> on the same <code>Manager</code> instance. * </ul> * * @author Craig R. McClanahan
*/ publicinterface Manager {
/** * Get the Context with which this Manager is associated. * * @return The associated Context
*/
Context getContext();
/** * Set the Context with which this Manager is associated. The Context must * be set to a non-null value before the Manager is first used. Multiple * calls to this method before first use are permitted. Once the Manager has * been used, this method may not be used to change the Context (including * setting a {@code null} value) that the Manager is associated with. * * @param context The newly associated Context
*/ void setContext(Context context);
/** * @return the session id generator
*/
SessionIdGenerator getSessionIdGenerator();
/** * Sets the session id generator * * @param sessionIdGenerator The session id generator
*/ void setSessionIdGenerator(SessionIdGenerator sessionIdGenerator);
/** * Returns the total number of sessions created by this manager. * * @return Total number of sessions created by this manager.
*/ long getSessionCounter();
/** * Sets the total number of sessions created by this manager. * * @param sessionCounter Total number of sessions created by this manager.
*/ void setSessionCounter(long sessionCounter);
/** * Gets the maximum number of sessions that have been active at the same * time. * * @return Maximum number of sessions that have been active at the same * time
*/ int getMaxActive();
/** * (Re)sets the maximum number of sessions that have been active at the * same time. * * @param maxActive Maximum number of sessions that have been active at * the same time.
*/ void setMaxActive(int maxActive);
/** * Gets the number of currently active sessions. * * @return Number of currently active sessions
*/ int getActiveSessions();
/** * Gets the number of sessions that have expired. * * @return Number of sessions that have expired
*/ long getExpiredSessions();
/** * Sets the number of sessions that have expired. * * @param expiredSessions Number of sessions that have expired
*/ void setExpiredSessions(long expiredSessions);
/** * Gets the number of sessions that were not created because the maximum * number of active sessions was reached. * * @return Number of rejected sessions
*/ int getRejectedSessions();
/** * Gets the longest time (in seconds) that an expired session had been * alive. * * @return Longest time (in seconds) that an expired session had been * alive.
*/ int getSessionMaxAliveTime();
/** * Sets the longest time (in seconds) that an expired session had been * alive. * * @param sessionMaxAliveTime Longest time (in seconds) that an expired * session had been alive.
*/ void setSessionMaxAliveTime(int sessionMaxAliveTime);
/** * Gets the average time (in seconds) that expired sessions had been * alive. This may be based on sample data. * * @return Average time (in seconds) that expired sessions had been * alive.
*/ int getSessionAverageAliveTime();
/** * Gets the current rate of session creation (in session per minute). This * may be based on sample data. * * @return The current rate (in sessions per minute) of session creation
*/ int getSessionCreateRate();
/** * Gets the current rate of session expiration (in session per minute). This * may be based on sample data * * @return The current rate (in sessions per minute) of session expiration
*/ int getSessionExpireRate();
// --------------------------------------------------------- Public Methods
/** * Add this Session to the set of active Sessions for this Manager. * * @param session Session to be added
*/ void add(Session session);
/** * Add a property change listener to this component. * * @param listener The listener to add
*/ void addPropertyChangeListener(PropertyChangeListener listener);
/** * Change the session ID of the current session to a new randomly generated * session ID. * * @param session The session to change the session ID for * * @return The new session ID
*/ default String rotateSessionId(Session session) {
String newSessionId = null; // Assume the new Id is a duplicate until we prove it isn't. The // chances of a duplicate are extremely low but the current ManagerBase // code protects against duplicates so this default method does too. boolean duplicate = true; do {
newSessionId = getSessionIdGenerator().generateSessionId(); try { if (findSession(newSessionId) == null) {
duplicate = false;
}
} catch (IOException ioe) { // Swallow. An IOE means the ID was known so continue looping
}
} while (duplicate);
changeSessionId(session, newSessionId); return newSessionId;
}
/** * Change the session ID of the current session to a specified session ID. * * @param session The session to change the session ID for * @param newId new session ID
*/ void changeSessionId(Session session, String newId);
/** * Get a session from the recycled ones or create a new empty one. * The PersistentManager manager does not need to create session data * because it reads it from the Store. * * @return An empty Session object
*/
Session createEmptySession();
/** * Construct and return a new session object, based on the default * settings specified by this Manager's properties. The session * id specified will be used as the session id. * If a new session cannot be created for any reason, return * <code>null</code>. * * @param sessionId The session id which should be used to create the * new session; if <code>null</code>, the session * id will be assigned by this method, and available via the getId() * method of the returned session. * @exception IllegalStateException if a new session cannot be * instantiated for any reason * * @return An empty Session object with the given ID or a newly created * session ID if none was specified
*/
Session createSession(String sessionId);
/** * Return the active Session, associated with this Manager, with the * specified session id (if any); otherwise return <code>null</code>. * * @param id The session id for the session to be returned * * @exception IllegalStateException if a new session cannot be * instantiated for any reason * @exception IOException if an input/output error occurs while * processing this request * * @return the request session or {@code null} if a session with the * requested ID could not be found
*/
Session findSession(String id) throws IOException;
/** * Return the set of active Sessions associated with this Manager. * If this Manager has no active Sessions, a zero-length array is returned. * * @return All the currently active sessions managed by this manager
*/
Session[] findSessions();
/** * Load any currently active sessions that were previously unloaded * to the appropriate persistence mechanism, if any. If persistence is not * supported, this method returns without doing anything. * * @exception ClassNotFoundException if a serialized class cannot be * found during the reload * @exception IOException if an input/output error occurs
*/ void load() throws ClassNotFoundException, IOException;
/** * Remove this Session from the active Sessions for this Manager. * * @param session Session to be removed
*/ void remove(Session session);
/** * Remove this Session from the active Sessions for this Manager. * * @param session Session to be removed * @param update Should the expiration statistics be updated
*/ void remove(Session session, boolean update);
/** * Remove a property change listener from this component. * * @param listener The listener to remove
*/ void removePropertyChangeListener(PropertyChangeListener listener);
/** * Save any currently active sessions in the appropriate persistence * mechanism, if any. If persistence is not supported, this method * returns without doing anything. * * @exception IOException if an input/output error occurs
*/ void unload() throws IOException;
/** * This method will be invoked by the context/container on a periodic * basis and allows the manager to implement * a method that executes periodic tasks, such as expiring sessions etc.
*/ void backgroundProcess();
/** * Would the Manager distribute the given session attribute? Manager * implementations may provide additional configuration options to control * which attributes are distributable. * * @param name The attribute name * @param value The attribute value * * @return {@code true} if the Manager would distribute the given attribute * otherwise {@code false}
*/ boolean willAttributeDistribute(String name, Object value);
/** * When an attribute that is already present in the session is added again * under the same name and the attribute implements {@link * jakarta.servlet.http.HttpSessionBindingListener}, should * {@link jakarta.servlet.http.HttpSessionBindingListener#valueUnbound(jakarta.servlet.http.HttpSessionBindingEvent)} * be called followed by * {@link jakarta.servlet.http.HttpSessionBindingListener#valueBound(jakarta.servlet.http.HttpSessionBindingEvent)}? * <p> * The default value is {@code false}. * * @return {@code true} if the listener will be notified, {@code false} if * it will not
*/ defaultboolean getNotifyBindingListenerOnUnchangedValue() { returnfalse;
}
/** * Configure if * {@link jakarta.servlet.http.HttpSessionBindingListener#valueUnbound(jakarta.servlet.http.HttpSessionBindingEvent)} * be called followed by * {@link jakarta.servlet.http.HttpSessionBindingListener#valueBound(jakarta.servlet.http.HttpSessionBindingEvent)} * when an attribute that is already present in the session is added again * under the same name and the attribute implements {@link * jakarta.servlet.http.HttpSessionBindingListener}. * * @param notifyBindingListenerOnUnchangedValue {@code true} the listener * will be called, {@code * false} it will not
*/ void setNotifyBindingListenerOnUnchangedValue( boolean notifyBindingListenerOnUnchangedValue);
/** * When an attribute that is already present in the session is added again * under the same name and a {@link * jakarta.servlet.http.HttpSessionAttributeListener} is configured for the * session should * {@link jakarta.servlet.http.HttpSessionAttributeListener#attributeReplaced(jakarta.servlet.http.HttpSessionBindingEvent)} * be called? * <p> * The default value is {@code true}. * * @return {@code true} if the listener will be notified, {@code false} if * it will not
*/ defaultboolean getNotifyAttributeListenerOnUnchangedValue() { returntrue;
}
/** * Configure if * {@link jakarta.servlet.http.HttpSessionAttributeListener#attributeReplaced(jakarta.servlet.http.HttpSessionBindingEvent)} * when an attribute that is already present in the session is added again * under the same name and a {@link * jakarta.servlet.http.HttpSessionAttributeListener} is configured for the * session. * * @param notifyAttributeListenerOnUnchangedValue {@code true} the listener * will be called, {@code * false} it will not
*/ void setNotifyAttributeListenerOnUnchangedValue( boolean notifyAttributeListenerOnUnchangedValue);
/** * If this is <code>true</code>, Tomcat will track the number of active * requests for each session. When determining if a session is valid, any * session with at least one active request will always be considered valid. * If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to * <code>true</code>, the default of this setting will be <code>true</code>, * else the default value will be <code>false</code>. * @return the flag value
*/ defaultboolean getSessionActivityCheck() { return Globals.STRICT_SERVLET_COMPLIANCE;
}
/** * Configure if Tomcat will track the number of active requests for each * session. When determining if a session is valid, any session with at * least one active request will always be considered valid. * @param sessionActivityCheck the new flag value
*/ void setSessionActivityCheck(boolean sessionActivityCheck);
/** * If this is <code>true</code>, the last accessed time for sessions will * be calculated from the beginning of the previous request. If * <code>false</code>, the last accessed time for sessions will be calculated * from the end of the previous request. This also affects how the idle time * is calculated. * If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to * <code>true</code>, the default of this setting will be <code>true</code>, * else the default value will be <code>false</code>. * @return the flag value
*/ defaultboolean getSessionLastAccessAtStart() { return Globals.STRICT_SERVLET_COMPLIANCE;
}
/** * Configure if the last accessed time for sessions will * be calculated from the beginning of the previous request. If * <code>false</code>, the last accessed time for sessions will be calculated * from the end of the previous request. This also affects how the idle time * is calculated. * @param sessionLastAccessAtStart the new flag value
*/ void setSessionLastAccessAtStart(boolean sessionLastAccessAtStart);
}
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