/*
* Copyright 2007-2010 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Sun designates this particular file as subject to the "Classpath"
* exception as provided by Sun in the LICENSE file that accompanied
* this code.
*
* --
*/
package com.sun.sgs.app;
import com.sun.sgs.internal.InternalContext;
/**
* Provides access to facilities available in the current application context.
* The {@code AppContext} uses the {@link InternalContext} to retrieve
* managers via its {@link com.sun.sgs.internal.ManagerLocator ManagerLocator}.
* This class should not be instantiated.
*/
public final class AppContext {
/** This class should not be instantiated. */
private AppContext() { }
/**
* Returns the {@code ChannelManager} for use by the current
* application. The object returned is not serializable, and should not be
* stored as part of a managed object.
*
* @return the {@code ChannelManager} for the current application
* @throws ManagerNotFoundException if the {@code ChannelManager} cannot
* be located
*/
public static ChannelManager getChannelManager() {
try {
return InternalContext.getManagerLocator().getChannelManager();
} catch (IllegalStateException ise) {
throw new ManagerNotFoundException("ManagerLocator is " +
"unavailable", ise);
}
}
/**
* Returns the {@code DataManager} for use by the current application.
* The object returned is not serializable, and should not be stored as
* part of a managed object.
*
* @return the {@code DataManager} for the current application
* @throws ManagerNotFoundException if the {@code DataManager} cannot
* be located
*/
public static DataManager getDataManager() {
try {
return InternalContext.getManagerLocator().getDataManager();
} catch (IllegalStateException ise) {
throw new ManagerNotFoundException("ManagerLocator is " +
"unavailable", ise);
}
}
/**
* Returns the {@code TaskManager} for use by the current application.
* The object returned is not serializable, and should not be stored as
* part of a managed object.
*
* @return the {@code TaskManager} for the current application
* @throws ManagerNotFoundException if the {@code TaskManager} cannot
* be located
*/
public static TaskManager getTaskManager() {
try {
return InternalContext.getManagerLocator().getTaskManager();
} catch (IllegalStateException ise) {
throw new ManagerNotFoundException("ManagerLocator is " +
"unavailable", ise);
}
}
/**
* Returns a manager of the specified type for use by the current
* application. The object returned is not serializable, and should not be
* stored as part of a managed object.
*
* @param <T> the type of the manager
* @param type a class representing the type of the manager
* @return the manager of the specified type for the current application
* @throws ManagerNotFoundException if no manager is found for the
* specified type
*/
public static <T> T getManager(Class<T> type) {
try {
return InternalContext.getManagerLocator().getManager(type);
} catch (IllegalStateException ise) {
throw new ManagerNotFoundException("ManagerLocator is " +
"unavailable", ise);
}
}
}