676 lines
21 KiB
Java
676 lines
21 KiB
Java
/*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at <http://www.mozilla.org/MPL/>.
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*
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* Software distributed under the License is distributed on an "AS IS" basis, WITHOUT
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* WARRANTY OF ANY KIND, either express or implied. See the License for the specific
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* language governing rights and limitations under the License.
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*
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* The Original Code is the Venice Web Communities System.
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*
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* The Initial Developer of the Original Code is Eric J. Bowersox <erbo@silcom.com>,
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* for Silverwrist Design Studios. Portions created by Eric J. Bowersox are
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* Copyright (C) 2002 Eric J. Bowersox/Silverwrist Design Studios. All Rights Reserved.
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*
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* Contributor(s):
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*/
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package com.silverwrist.dynamo.app;
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import java.util.*;
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import org.apache.log4j.Logger;
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import com.silverwrist.dynamo.except.*;
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import com.silverwrist.dynamo.iface.*;
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import com.silverwrist.dynamo.util.*;
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class ApplicationServiceManager implements HookServiceProviders
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{
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/*--------------------------------------------------------------------------------
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* Internal class implementing initialization services
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*--------------------------------------------------------------------------------
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*/
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private class InitServices extends BaseDelegatingServiceProvider
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{
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/*====================================================================
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* Constructors
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*====================================================================
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*/
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InitServices()
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{
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super("Initialization Services");
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} // end constructor
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InitServices(ServiceProvider sp)
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{
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super("Initialization Services",sp);
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} // end constructor
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/*====================================================================
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* Overrides from class BaseDelegatingServiceProvider
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*====================================================================
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*/
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/**
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* Queries this object for a specified service.
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*
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* @param klass The class of the object that should be returned as a service.
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* @return A service object. The service object is guaranteed to be of the class
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* specified by <CODE>klass</CODE>; that is, if <CODE>queryService(klass)</CODE>
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* yields some object <CODE>x</CODE>, then the expression <CODE>klass.isInstance(x)</CODE>
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* is true.
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* @exception com.silverwrist.dynamo.except.NoSuchServiceException If no service is available in
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* the specified class.
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*/
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public Object queryService(Class klass)
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{
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Object rc = m_init_service_cache.get(klass);
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if (rc!=null) // found in the cache!
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return rc;
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for (int i=(m_init_service_hooks.size()-1); i>=0; i--)
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{ // call the hooks
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try
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{ // get hooks in reverse order of installation and try them
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ServiceProvider sp = (ServiceProvider)(m_init_service_hooks.get(i));
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rc = sp.queryService(klass);
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m_init_service_cache.put(klass,rc);
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return rc;
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} // end try
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catch (NoSuchServiceException e)
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{ // cycle around and keep trying
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} // end catch
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} // end for
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rc = m_init_services.get(klass);
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if (rc!=null)
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{ // cache the service
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m_init_service_cache.put(klass,rc);
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return rc;
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} // end if
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return super.queryService(klass);
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} // end queryService
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/**
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* Queries this object for a specified service.
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*
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* @param klass The class of the object that should be returned as a service.
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* @param serviceid ID for the service to be requested, to further discriminate between requests.
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* @return A service object. The service object is guaranteed to be of the class
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* specified by <CODE>klass</CODE>; that is, if <CODE>queryService(klass)</CODE>
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* yields some object <CODE>x</CODE>, then the expression <CODE>klass.isInstance(x)</CODE>
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* is true.
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* @exception com.silverwrist.dynamo.except.NoSuchServiceException If no service is available in
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* the specified class.
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*/
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public Object queryService(Class klass, String serviceid)
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{
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ServiceKey key = new ServiceKey(klass,serviceid);
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Object rc = m_init_service_cache.get(key);
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if (rc!=null)
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return rc;
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for (int i=(m_init_service_hooks.size()-1); i>=0; i--)
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{ // call the hooks
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try
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{ // get hooks in reverse order of installation and try them
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ServiceProvider sp = (ServiceProvider)(m_init_service_hooks.get(i));
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rc = sp.queryService(klass,serviceid);
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m_init_service_cache.put(key,rc);
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return rc;
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} // end try
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catch (NoSuchServiceException e)
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{ // cycle around and keep trying
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} // end catch
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} // end for
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try
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{ // call through to superclass
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return super.queryService(klass,serviceid);
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} // end try
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catch (NoSuchServiceException e)
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{ // OK, try it without the service ID
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rc = queryService(klass);
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m_init_service_cache.put(key,rc);
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return rc;
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} // end catch
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} // end queryService
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} // end class InitServices
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/*--------------------------------------------------------------------------------
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* Internal class implementing runtime services
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*--------------------------------------------------------------------------------
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*/
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private class RuntimeServices extends BaseDelegatingServiceProvider
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{
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/*====================================================================
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* Constructors
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*====================================================================
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*/
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RuntimeServices()
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{
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super("Application Services");
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} // end constructor
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RuntimeServices(ServiceProvider sp)
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{
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super("Application Services",sp);
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} // end constructor
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/*====================================================================
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* Overrides from class BaseDelegatingServiceProvider
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*====================================================================
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*/
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/**
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* Queries this object for a specified service.
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*
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* @param klass The class of the object that should be returned as a service.
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* @return A service object. The service object is guaranteed to be of the class
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* specified by <CODE>klass</CODE>; that is, if <CODE>queryService(klass)</CODE>
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* yields some object <CODE>x</CODE>, then the expression <CODE>klass.isInstance(x)</CODE>
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* is true.
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* @exception com.silverwrist.dynamo.except.NoSuchServiceException If no service is available in
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* the specified class.
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*/
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public Object queryService(Class klass)
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{
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Object rc = m_runtime_service_cache.get(klass);
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if (rc!=null)
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return rc;
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for (int i=(m_runtime_service_hooks.size()-1); i>=0; i--)
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{ // call the hooks
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try
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{ // get hooks in reverse order of installation and try them
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ServiceProvider sp = (ServiceProvider)(m_runtime_service_hooks.get(i));
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rc = sp.queryService(klass);
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m_runtime_service_cache.put(klass,rc);
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return rc;
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} // end try
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catch (NoSuchServiceException e)
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{ // cycle around and keep trying
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} // end catch
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} // end for
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rc = m_runtime_services.get(klass);
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if (rc!=null)
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{ // cache the service
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m_runtime_service_cache.put(klass,rc);
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return rc;
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} // end if
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return super.queryService(klass);
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} // end queryService
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/**
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* Queries this object for a specified service.
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*
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* @param klass The class of the object that should be returned as a service.
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* @param serviceid ID for the service to be requested, to further discriminate between requests.
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* @return A service object. The service object is guaranteed to be of the class
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* specified by <CODE>klass</CODE>; that is, if <CODE>queryService(klass)</CODE>
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* yields some object <CODE>x</CODE>, then the expression <CODE>klass.isInstance(x)</CODE>
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* is true.
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* @exception com.silverwrist.dynamo.except.NoSuchServiceException If no service is available in
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* the specified class.
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*/
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public Object queryService(Class klass, String serviceid)
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{
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ServiceKey key = new ServiceKey(klass,serviceid);
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Object rc = m_runtime_service_cache.get(key);
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if (rc!=null)
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return rc;
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for (int i=(m_runtime_service_hooks.size()-1); i>=0; i--)
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{ // call the hooks
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try
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{ // get hooks in reverse order of installation and try them
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ServiceProvider sp = (ServiceProvider)(m_runtime_service_hooks.get(i));
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rc = sp.queryService(klass,serviceid);
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m_runtime_service_cache.put(key,rc);
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return rc;
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} // end try
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catch (NoSuchServiceException e)
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{ // cycle around and keep trying
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} // end catch
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} // end for
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try
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{ // call through to superclass
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return super.queryService(klass,serviceid);
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} // end try
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catch (NoSuchServiceException e)
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{ // OK, try it without the service ID
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rc = queryService(klass);
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m_runtime_service_cache.put(key,rc);
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return rc;
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} // end catch
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} // end queryService
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} // end class RuntimeServices
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/*--------------------------------------------------------------------------------
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* Internal class implementing output services
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*--------------------------------------------------------------------------------
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*/
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private class OutputServices extends BaseDelegatingServiceProvider
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{
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/*====================================================================
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* Constructors
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*====================================================================
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*/
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OutputServices()
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{
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super("Application Output Services");
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} // end constructor
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OutputServices(ServiceProvider sp)
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{
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super("Application Output Services",sp);
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} // end constructor
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/*====================================================================
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* Overrides from class BaseDelegatingServiceProvider
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*====================================================================
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*/
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/**
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* Queries this object for a specified service.
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*
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* @param klass The class of the object that should be returned as a service.
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* @return A service object. The service object is guaranteed to be of the class
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* specified by <CODE>klass</CODE>; that is, if <CODE>queryService(klass)</CODE>
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* yields some object <CODE>x</CODE>, then the expression <CODE>klass.isInstance(x)</CODE>
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* is true.
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* @exception com.silverwrist.dynamo.except.NoSuchServiceException If no service is available in
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* the specified class.
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*/
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public Object queryService(Class klass)
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{
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Object rc = m_output_service_cache.get(klass);
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if (rc!=null)
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return rc;
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for (int i=(m_output_service_hooks.size()-1); i>=0; i--)
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{ // call the hooks
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try
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{ // get hooks in reverse order of installation and try them
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ServiceProvider sp = (ServiceProvider)(m_output_service_hooks.get(i));
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rc = sp.queryService(klass);
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m_output_service_cache.put(klass,rc);
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return rc;
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} // end try
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catch (NoSuchServiceException e)
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{ // cycle around and keep trying
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} // end catch
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} // end for
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rc = m_output_services.get(klass);
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if (rc!=null)
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{ // cache the service
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m_output_service_cache.put(klass,rc);
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return rc;
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} // end if
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return super.queryService(klass);
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} // end queryService
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/**
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* Queries this object for a specified service.
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*
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* @param klass The class of the object that should be returned as a service.
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* @param serviceid ID for the service to be requested, to further discriminate between requests.
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* @return A service object. The service object is guaranteed to be of the class
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* specified by <CODE>klass</CODE>; that is, if <CODE>queryService(klass)</CODE>
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* yields some object <CODE>x</CODE>, then the expression <CODE>klass.isInstance(x)</CODE>
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* is true.
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* @exception com.silverwrist.dynamo.except.NoSuchServiceException If no service is available in
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* the specified class.
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*/
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public Object queryService(Class klass, String serviceid)
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{
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ServiceKey key = new ServiceKey(klass,serviceid);
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Object rc = m_output_service_cache.get(key);
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if (rc!=null)
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return rc;
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for (int i=(m_output_service_hooks.size()-1); i>=0; i--)
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{ // call the hooks
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try
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{ // get hooks in reverse order of installation and try them
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ServiceProvider sp = (ServiceProvider)(m_output_service_hooks.get(i));
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rc = sp.queryService(klass,serviceid);
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m_output_service_cache.put(key,rc);
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return rc;
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} // end try
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catch (NoSuchServiceException e)
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{ // cycle around and keep trying
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} // end catch
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} // end for
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try
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{ // call through to superclass
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return super.queryService(klass,serviceid);
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} // end try
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catch (NoSuchServiceException e)
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{ // OK, try it without the service ID
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rc = queryService(klass);
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m_output_service_cache.put(key,rc);
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return rc;
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} // end catch
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} // end queryService
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} // end class OutputServices
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/*--------------------------------------------------------------------------------
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* Internal class implementing removal of init service hook
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*--------------------------------------------------------------------------------
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*/
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private class RemoveInitServiceHook implements ComponentShutdown
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{
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/*====================================================================
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* Attributes
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*====================================================================
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*/
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private ServiceProvider m_sp;
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/*====================================================================
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* Constructor
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*====================================================================
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*/
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RemoveInitServiceHook(ServiceProvider sp)
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{
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m_sp = sp;
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} // end constructor
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/*====================================================================
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* Implementations from interface ComponentShutdown
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*====================================================================
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*/
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public void shutdown()
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{
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m_init_service_hooks.remove(m_sp);
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m_init_service_cache.clear();
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} // end shutdown
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} // end class RemoveInitServiceHook
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/*--------------------------------------------------------------------------------
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* Internal class implementing removal of runtime service hook
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*--------------------------------------------------------------------------------
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*/
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private class RemoveRuntimeServiceHook implements ComponentShutdown
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{
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/*====================================================================
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* Attributes
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*====================================================================
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*/
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private ServiceProvider m_sp;
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/*====================================================================
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* Constructor
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*====================================================================
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*/
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RemoveRuntimeServiceHook(ServiceProvider sp)
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{
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m_sp = sp;
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} // end constructor
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/*====================================================================
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* Implementations from interface ComponentShutdown
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*====================================================================
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*/
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public void shutdown()
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{
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m_runtime_service_hooks.remove(m_sp);
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m_runtime_service_cache.clear();
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} // end shutdown
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} // end class RemoveRuntimeServiceHook
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/*--------------------------------------------------------------------------------
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* Internal class implementing removal of output service hook
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*--------------------------------------------------------------------------------
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*/
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private class RemoveOutputServiceHook implements ComponentShutdown
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{
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/*====================================================================
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* Attributes
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*====================================================================
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*/
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private ServiceProvider m_sp;
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/*====================================================================
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* Constructor
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*====================================================================
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*/
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RemoveOutputServiceHook(ServiceProvider sp)
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{
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m_sp = sp;
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} // end constructor
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/*====================================================================
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* Implementations from interface ComponentShutdown
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*====================================================================
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*/
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public void shutdown()
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{
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m_output_service_hooks.remove(m_sp);
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m_output_service_cache.clear();
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} // end shutdown
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} // end class RemoveOutputServiceHook
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/*--------------------------------------------------------------------------------
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* Static data members
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*--------------------------------------------------------------------------------
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*/
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private static Logger logger = Logger.getLogger(ApplicationServiceManager.class);
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/*--------------------------------------------------------------------------------
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* Attributes
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*--------------------------------------------------------------------------------
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*/
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private Hashtable m_init_services = new Hashtable(); // initializing services
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private Vector m_init_service_hooks = new Vector(); // hooks for initializing services
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private Hashtable m_init_service_cache = new Hashtable(); // cache of init services
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private Hashtable m_runtime_services = new Hashtable(); // runtime services
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private Vector m_runtime_service_hooks = new Vector(); // hooks for runtime services
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private Hashtable m_runtime_service_cache = new Hashtable(); // cache of runtime services
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private Hashtable m_output_services = new Hashtable(); // output services
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private Vector m_output_service_hooks = new Vector(); // hooks for output services
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private Hashtable m_output_service_cache = new Hashtable(); // cache of output services
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private InitServices m_solo_init = null; // only one "null" init service
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private RuntimeServices m_solo_runtime = null; // only one "null" runtime service
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private OutputServices m_solo_output = null; // only one "null" output service
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/*--------------------------------------------------------------------------------
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* Constructor
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*--------------------------------------------------------------------------------
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*/
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ApplicationServiceManager()
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{ // do nothing
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} // end constructor
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/*--------------------------------------------------------------------------------
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* Implementations from interface HookServiceProviders
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*--------------------------------------------------------------------------------
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*/
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public ServiceProvider getCurrentInitServices()
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{
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return createInitServices();
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} // end getCurrentInitServices
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public ServiceProvider getCurrentRuntimeServices()
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{
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return createRuntimeServices();
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} // end getCurrentRuntimeServices
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public ServiceProvider getCurrentOutputServices()
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{
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return createOutputServices();
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} // end getCurrentOutputServices
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public ComponentShutdown hookInitServiceProvider(ServiceProvider sp)
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{
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m_init_service_hooks.add(sp);
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m_init_service_cache.clear();
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return new RemoveInitServiceHook(sp);
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} // end hookInitServiceProvider
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public ComponentShutdown hookRuntimeServiceProvider(ServiceProvider sp)
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{
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m_runtime_service_hooks.add(sp);
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m_runtime_service_cache.clear();
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|
return new RemoveRuntimeServiceHook(sp);
|
|
|
|
} // end hookRuntimeServiceProvider
|
|
|
|
public ComponentShutdown hookOutputServiceProvider(ServiceProvider sp)
|
|
{
|
|
m_output_service_hooks.add(sp);
|
|
m_output_service_cache.clear();
|
|
return new RemoveOutputServiceHook(sp);
|
|
|
|
} // end hookOutputServiceProvider
|
|
|
|
/*--------------------------------------------------------------------------------
|
|
* External operations
|
|
*--------------------------------------------------------------------------------
|
|
*/
|
|
|
|
void addInitService(Class klass, Object svc)
|
|
{
|
|
m_init_services.put(klass,svc);
|
|
|
|
} // end addInitService
|
|
|
|
void addRuntimeService(Class klass, Object svc)
|
|
{
|
|
m_runtime_services.put(klass,svc);
|
|
|
|
} // end addRuntimeService
|
|
|
|
void addOutputService(Class klass, Object svc)
|
|
{
|
|
m_output_services.put(klass,svc);
|
|
|
|
} // end addRuntimeService
|
|
|
|
ServiceProvider createInitServices()
|
|
{
|
|
if (m_solo_init==null)
|
|
m_solo_init = new InitServices();
|
|
return m_solo_init;
|
|
|
|
} // end createInitServices
|
|
|
|
ServiceProvider createInitServices(ServiceProvider sp)
|
|
{
|
|
if (sp==null)
|
|
return createInitServices();
|
|
return new InitServices(sp);
|
|
|
|
} // end createRuntimeServices
|
|
|
|
ServiceProvider createRuntimeServices()
|
|
{
|
|
if (m_solo_runtime==null)
|
|
m_solo_runtime = new RuntimeServices();
|
|
return m_solo_runtime;
|
|
|
|
} // end createRuntimeServices
|
|
|
|
ServiceProvider createRuntimeServices(ServiceProvider sp)
|
|
{
|
|
if (sp==null)
|
|
return createRuntimeServices();
|
|
return new RuntimeServices(sp);
|
|
|
|
} // end createRuntimeServices
|
|
|
|
ServiceProvider createOutputServices()
|
|
{
|
|
if (m_solo_output==null)
|
|
m_solo_output = new OutputServices();
|
|
return m_solo_output;
|
|
|
|
} // end createOutputServices
|
|
|
|
ServiceProvider createOutputServices(ServiceProvider sp)
|
|
{
|
|
if (sp==null)
|
|
return createOutputServices();
|
|
return new OutputServices(sp);
|
|
|
|
} // end createOutputServices
|
|
|
|
} // end class ApplicationServiceManager
|