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