org.dspace.servicemanager.DSpaceServiceManager Maven / Gradle / Ivy
/**
* The contents of this file are subject to the license and copyright
* detailed in the LICENSE and NOTICE files at the root of the source
* tree and available online at
*
* http://www.dspace.org/license/
*/
package org.dspace.servicemanager;
import java.util.*;
import java.util.Map.Entry;
import org.apache.commons.lang.ArrayUtils;
import org.dspace.kernel.Activator;
import org.dspace.kernel.mixins.ConfigChangeListener;
import org.dspace.kernel.mixins.InitializedService;
import org.dspace.kernel.mixins.ServiceChangeListener;
import org.dspace.kernel.mixins.ServiceManagerReadyAware;
import org.dspace.kernel.mixins.ShutdownService;
import org.dspace.servicemanager.config.DSpaceConfigurationService;
import org.dspace.servicemanager.spring.SpringServiceManager;
import org.dspace.services.ConfigurationService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.PropertyAccessorFactory;
/**
* This is the core service manager which ties together the other
* service managers and generally handles any edge cases in the various
* systems.
*
* @author Aaron Zeckoski (azeckoski @ gmail.com)
*/
public final class DSpaceServiceManager implements ServiceManagerSystem {
private static Logger log = LoggerFactory.getLogger(DSpaceServiceManager.class);
private final DSpaceConfigurationService configurationService;
protected boolean running = false;
/**
* @return true if the service manager is running
*/
public boolean isRunning() {
return running;
}
/**
* Checks to see if the service manager is running, if not throws an exception
* @throws IllegalStateException if not running
*/
private void checkRunning() {
if (! isRunning()) {
throw new IllegalStateException("Cannot perform operations on a service manager that is not running");
}
}
private List serviceManagers = Collections.synchronizedList(new ArrayList());
private SpringServiceManager primaryServiceManager = null;
/**
* This holds the stack of activators. It is randomly ordered.
*/
private List activators = Collections.synchronizedList(new ArrayList());
protected boolean developing = false;
/**
* Standard constructor.
* @param configurationService current DSpace configuration service
*/
public DSpaceServiceManager(DSpaceConfigurationService configurationService) {
if (configurationService == null) {
throw new IllegalArgumentException("Failure creating service manager, configuration service is null");
}
this.configurationService = configurationService;
this.developing = configurationService.getPropertyAsType("service.manager.developing", boolean.class);
}
protected boolean testing = false;
protected String[] springXmlConfigFiles = null;
/**
* TESTING - This is for testing only.
* @param configurationService current DSpace configuration service
* @param springXmlConfigFiles one or more Spring XML configs
*/
protected DSpaceServiceManager(DSpaceConfigurationService configurationService, String... springXmlConfigFiles) {
this.configurationService = configurationService;
this.springXmlConfigFiles = springXmlConfigFiles;
this.testing = true;
this.developing = true;
}
/**
* Registers the activators using this service manager.
*/
private void registerActivators() {
for (Activator activator : this.getServicesByType(Activator.class))
{
// succeeded creating the activator
try {
activator.start(this);
activators.add(activator);
log.info("Started and registered activator: " + activator.getClass().getName());
} catch (Exception e1) {
log.error("ERROR: Failed to start activator ("+ activator.getClass().getName() +"): " + e1.getMessage(), e1);
}
}
}
/**
* Unregisters all registered activators using this service manager.
*/
private void unregisterActivators() {
for (Activator activator : activators) {
if (activator != null) {
String activatorClassName = activator.getClass().getName();
// succeeded creating the activator
try {
activator.stop(this);
log.info("Stopped and unregistered activator: " + activatorClassName);
} catch (Exception e1) {
log.error("ERROR: Failed to stop activator ("+activatorClassName+"): " + e1.getMessage(), e1);
}
}
}
activators.clear();
}
/**
* This will call all the services which want to be notified when the service manager is ready
*/
public void notifyServiceManagerReady() {
for (ServiceManagerSystem sms : serviceManagers) {
List services = sms.getServicesByType(ServiceManagerReadyAware.class);
for (ServiceManagerReadyAware serviceManagerReadyAware : services) {
try {
serviceManagerReadyAware.serviceManagerReady(this);
} catch (Exception e) {
log.error("ERROR: Failure in service when calling serviceManagerReady: " + e.getMessage(), e);
}
}
}
}
/**
* Checks to see if a listener should be notified
* @param implementedTypes the types implemented by the service changing
* @param serviceChangeListener the listener
* @return true if it should be notified, false otherwise
*/
private boolean checkNotifyServiceChange(List> implementedTypes,
ServiceChangeListener serviceChangeListener) {
boolean notify = false;
Class[] notifyTypes = serviceChangeListener.notifyForTypes();
if (notifyTypes == null || notifyTypes.length == 0) {
notify = true;
} else {
for (Class notifyType : notifyTypes) {
for (Class implementedType : implementedTypes) {
if (notifyType.equals(implementedType)) {
notify = true;
break;
}
}
}
}
return notify;
}
/**
* Shut down all service managers, including this one.
*/
@Override
public void shutdown() {
unregisterActivators();
for (ServiceManagerSystem sms : serviceManagers) {
try {
sms.shutdown();
} catch (Exception e) {
// shutdown failures are not great but should NOT cause an interruption of processing
log.error("Failure shutting down service manager ("+sms+"): " + e.getMessage(), e);
}
}
this.running = false; // wait til the end
this.serviceManagers.clear();
this.primaryServiceManager = null;
log.info("Shutdown DSpace core service manager");
}
/* (non-Javadoc)
* @see org.dspace.servicemanager.ServiceManagerSystem#startup()
*/
@Override
public void startup() {
if (!testing) {
// try to load up extra config files for spring
String[] extraConfigs = configurationService.getPropertyAsType("service.manager.spring.configs", String[].class);
if (extraConfigs != null) {
if (springXmlConfigFiles == null) {
springXmlConfigFiles = extraConfigs;
} else {
springXmlConfigFiles = (String[])ArrayUtils.addAll(springXmlConfigFiles, extraConfigs);
}
}
}
try {
// have to put this at the top because otherwise initializing beans will die when they try to use the SMS
this.running = true;
// create the primary SMS and start it
SpringServiceManager springSMS = new SpringServiceManager(this, configurationService, testing, developing, springXmlConfigFiles);
try {
springSMS.startup();
} catch (Exception e) {
// startup failures are deadly
throw new IllegalStateException("failure starting up spring service manager: " + e.getMessage(), e);
}
// add it to the list of service managers
this.serviceManagers.add(springSMS);
this.primaryServiceManager = springSMS;
// now startup the activators
registerActivators();
// now we call the ready mixins
notifyServiceManagerReady();
} catch (Exception e) {
shutdown(); // execute the shutdown
String message = "Failed to startup the DSpace Service Manager: " + e.getMessage();
log.error(message, e);
throw new RuntimeException(message, e);
}
}
public void registerService(String name, Object service) {
checkRunning();
if (name == null || service == null) {
throw new IllegalArgumentException("name and service cannot be null");
}
// register service/provider with all
for (ServiceManagerSystem sms : serviceManagers) {
sms.registerService(name, service);
}
}
@Override
public void registerServiceNoAutowire(String name, Object service) {
checkRunning();
if (name == null || service == null) {
throw new IllegalArgumentException("name and service cannot be null");
}
// register service/provider with all
for (ServiceManagerSystem sms : serviceManagers) {
sms.registerServiceNoAutowire(name, service);
}
}
public T registerServiceClass(String name, Class type) {
checkRunning();
if (name == null || type == null) {
throw new IllegalArgumentException("name and type cannot be null");
}
// we only register with the primary
return primaryServiceManager.registerServiceClass(name, type);
}
public void unregisterService(String name) {
checkRunning();
if (name == null) {
throw new IllegalArgumentException("name cannot be null");
}
// only unregister with the primary
primaryServiceManager.unregisterService(name);
}
public T getServiceByName(String name, Class type) {
checkRunning();
if (type == null) {
throw new IllegalArgumentException("type cannot be null");
}
T service = null;
for (ServiceManagerSystem sms : serviceManagers) {
try {
service = sms.getServiceByName(name, type);
if (service != null) {
break;
}
} catch (Exception e) {
// keep going
}
}
// need to check the service mixin manager if not found
if (service == null
&& name != null) {
for (ServiceManagerSystem sms : serviceManagers) {
if (service == null) {
service = sms.getServiceByName(name, type);
}
}
}
return service;
}
public List getServicesByType(Class type) {
checkRunning();
if (type == null) {
throw new IllegalArgumentException("type cannot be null");
}
HashSet set = new HashSet();
for (ServiceManagerSystem sms : serviceManagers) {
try {
set.addAll( sms.getServicesByType(type) );
} catch (Exception e) {
// keep going
}
}
// put the set into a list for easier access and sort it
List services = new ArrayList(set);
Collections.sort(services, new ServiceManagerUtils.ServiceComparator());
return services;
}
public List getServicesNames() {
checkRunning();
List names = new ArrayList();
for (ServiceManagerSystem sms : serviceManagers) {
try {
names.addAll( sms.getServicesNames() );
} catch (Exception e) {
// keep going
}
}
Collections.sort(names);
return names;
}
public boolean isServiceExists(String name) {
checkRunning();
if (name == null) {
throw new IllegalArgumentException("name cannot be null");
}
boolean exists = false;
for (ServiceManagerSystem sms : serviceManagers) {
try {
exists = sms.isServiceExists(name);
if (exists) {
break;
}
} catch (Exception e) {
// keep going
}
}
return exists;
}
public Map getServices() {
checkRunning();
Map services = new HashMap();
for (ServiceManagerSystem sms : serviceManagers) {
try {
for (Entry entry : sms.getServices().entrySet()) {
if (! services.containsKey(entry.getKey())) {
services.put(entry.getKey(), entry.getValue());
}
}
} catch (Exception e) {
// keep going if it fails for one
log.error("Failed to get list of services from service manager ("+sms.getClass()+"): " + e.getMessage(), e);
}
}
return services;
}
/*
* Handles the configuration push for all services.
* Every service gets called to notify them of the config change
* depending on the the listener they are using.
*/
public void pushConfig(Map properties) {
checkRunning();
if (properties != null && !properties.isEmpty()) {
// load in the new settings to the config service
String[] changedNames = configurationService.loadConfiguration(properties);
if (changedNames.length > 0) {
// some configs changed so push the changes to the listeners in all known services and providers
// make the list of changed setting names and map of changed settings
ArrayList changedSettingNames = new ArrayList();
Map changedSettings = new LinkedHashMap();
for (String configName : changedNames) {
changedSettingNames.add(configName);
changedSettings.put( configName, configurationService.getProperty(configName) );
}
// notify the services that implement the mixin
for (ServiceManagerSystem sms : serviceManagers) {
List configChangeListeners = sms.getServicesByType(ConfigChangeListener.class);
for (ConfigChangeListener configChangeListener : configChangeListeners) {
// notify this service
try {
boolean notify = false;
String[] notifyNames = configChangeListener.notifyForConfigNames();
if (notifyNames == null || notifyNames.length == 0) {
notify = true;
} else {
for (String notifyName : notifyNames) {
// check to see if the name matches one of those the listener cares about
for (String changedName : changedNames) {
if (notifyName != null && notifyName.equals(changedName)) {
notify = true;
break;
}
}
}
}
// do the notify if we should at this point
if (notify) {
configChangeListener.configurationChanged(changedSettingNames, changedSettings);
}
} catch (Exception e) {
log.error("Failure occurred while trying to notify service of config change: " + e.getMessage(), e);
}
}
}
}
}
}
// STATICS
/**
* Configures a given service (i.e. bean) based on any DSpace configuration
* settings which refer to it by name. .
*
* NOTE: Any configurations related to a specific service MUST be prefixed
* with the given service's name (e.g. [serviceName].setting = value)
*
* This method logs an error if it encounters configs which refer to a
* service by name, but is an invalid setting for that service.
*
* @param serviceName the name of the service
* @param service the service object (which will be configured)
* @param config the running configuration service
*/
public static void configureService(String serviceName, Object service, ConfigurationService config) {
// Check if the configuration has any properties whose prefix
// corresponds to this service's name
List configKeys = config.getPropertyKeys(serviceName);
if(configKeys!=null && !configKeys.isEmpty())
{
BeanWrapper beanWrapper = PropertyAccessorFactory.forBeanPropertyAccess(service);
for (String key : configKeys) {
// Remove serviceName prefix from key. This is the name of the actual bean's parameter
// This removes the first x chars, where x is length of serviceName + 1 char
// Format of Key: [serviceName].[param]
String param = key.substring(serviceName.length() + 1);
try {
// Attempt to set this configuration on the given service's bean
beanWrapper.setPropertyValue(param, config.getProperty(key));
log.info("Set param ("+param+") on service bean ("+serviceName+") to: " + config.getProperty(key));
} catch (RuntimeException e) {
// If an error occurs, just log it
log.error("Unable to set param ("+param+") on service bean ("+serviceName+") to: " + config.getProperty(key), e);
}
}
}
}
/**
* Initializes a service if it asks to be initialized or does nothing.
* @param service any bean
* @throws IllegalStateException if the service init fails
*/
public static void initService(Object service) {
if (service instanceof InitializedService) {
try {
((InitializedService) service).init();
} catch (Exception e) {
throw new IllegalStateException("Failure attempting to initialize service (" + service + "): " + e.getMessage(), e);
}
}
}
/**
* Shuts down a service if it asks to be shutdown or does nothing.
* @param service any bean
*/
public static void shutdownService(Object service) {
if (service instanceof ShutdownService) {
try {
((ShutdownService) service).shutdown();
} catch (Exception e) {
log.error("Failure shutting down service: " + service, e);
}
}
}
}
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