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/*
*
* Copyright 2012,2013 International Business Machines Corp.
*
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. Licensed 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 com.ibm.jbatch.container.servicesmanager;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.ibm.jbatch.container.callback.IJobEndCallbackService;
import com.ibm.jbatch.container.exception.BatchContainerServiceException;
import com.ibm.jbatch.container.exception.PersistenceException;
import com.ibm.jbatch.container.impl.BatchConfigImpl;
import com.ibm.jbatch.container.services.IBatchKernelService;
import com.ibm.jbatch.container.services.IJobStatusManagerService;
import com.ibm.jbatch.container.services.IPersistenceManagerService;
import com.ibm.jbatch.container.servicesmanager.ServiceTypes.Name;
import com.ibm.jbatch.container.util.BatchContainerConstants;
import com.ibm.jbatch.spi.BatchSPIManager;
import com.ibm.jbatch.spi.BatchSPIManager.PlatformMode;
import com.ibm.jbatch.spi.DatabaseConfigurationBean;
import com.ibm.jbatch.spi.ServiceRegistry;
import com.ibm.jbatch.spi.services.IBatchArtifactFactory;
import com.ibm.jbatch.spi.services.IBatchServiceBase;
import com.ibm.jbatch.spi.services.IBatchThreadPoolService;
import com.ibm.jbatch.spi.services.IJobXMLLoaderService;
import com.ibm.jbatch.spi.services.ITransactionManagementService;
/**
* Note a call to any of the getter methods besides getInstance() will perform the initialization routine and thereby
* 'harden' the config.
*/
public class ServicesManagerImpl implements BatchContainerConstants, ServicesManager {
private final static String sourceClass = ServicesManagerImpl.class.getName();
private final static Logger logger = Logger.getLogger(sourceClass);
private ServicesManagerImpl() { }
// Lazily-loaded singleton.
private static class ServicesManagerImplHolder {
private static final ServicesManagerImpl INSTANCE = new ServicesManagerImpl();
}
public static ServicesManager getInstance() {
return ServicesManagerImplHolder.INSTANCE;
}
// Declared 'volatile' to allow use in double-checked locking. This 'isInited'
// refers to whether the configuration has been hardened and possibly the
// first service impl loaded, not whether the instance has merely been instantiated.
private final byte[] isInitedLock = new byte[0];
private volatile Boolean isInited = Boolean.FALSE;
private DatabaseConfigurationBean databaseConfigBean = null;
private BatchConfigImpl batchConfigImpl;
private Properties batchContainerProps = null;
private Map serviceImplClassNames = ServiceTypes.getServiceImplClassNames();
private Map propertyNameTable = ServiceTypes.getServicePropertyNames();
// Registry of all current services
private final ConcurrentHashMap serviceRegistry = new ConcurrentHashMap();
private PlatformMode platformMode = null;
/**
* Init doesn't actually load the service impls, which are still loaded lazily. What it does is it
* hardens the config. This is necessary since the batch runtime by and large is not dynamically
* configurable, (e.g. via MBeans). Things like the database config used by the batch runtime's
* persistent store are hardened then, as are the names of the service impls to use.
*/
private void initIfNecessary() {
if (logger.isLoggable(Level.FINER)) {
logger.config("In initIfNecessary().");
}
// Use double-checked locking with volatile.
if (!isInited) {
synchronized (isInitedLock) {
if (!isInited) {
logger.config("--- Initializing ServicesManagerImpl ---");
batchConfigImpl = new BatchConfigImpl();
// Read config
readConfigFromPropertiesFiles();
readConfigFromSPI();
readConfigFromSystemProperties();
// Set config in memory
initBatchConfigImpl();
initServiceImplOverrides();
initDatabaseConfig();
initPlatformSEorEE();
isInited = Boolean.TRUE;
logger.config("--- Completed initialization of ServicesManagerImpl ---");
}
}
}
logger.config("Exiting initIfNecessary()");
}
private void readConfigFromPropertiesFiles() {
Properties serviceIntegratorProps = new Properties();
InputStream batchServicesListInputStream = this.getClass()
.getResourceAsStream("/META-INF/services/" + BATCH_INTEGRATOR_CONFIG_FILE);
if (batchServicesListInputStream != null) {
try {
logger.config("Batch Integrator Config File exists! loading it..");
serviceIntegratorProps.load(batchServicesListInputStream);
batchServicesListInputStream.close();
} catch (IOException e) {
logger.config("Error loading " + "/META-INF/services/" + BATCH_INTEGRATOR_CONFIG_FILE + " IOException=" + e.toString());
} catch (Exception e) {
logger.config("Error loading " + "/META-INF/services/" + BATCH_INTEGRATOR_CONFIG_FILE + " Exception=" + e.toString());
}
} else {
logger.config("Could not find batch integrator config file: " + "/META-INF/services/" + BATCH_INTEGRATOR_CONFIG_FILE);
}
// See if any do not map to service impls.
Set removeThese = new HashSet();
for (Object key : serviceIntegratorProps.keySet()) {
String keyStr = (String) key;
if (!propertyNameTable.containsKey(keyStr)) {
logger.warning("Found property named: " + keyStr
+ " with value: " + serviceIntegratorProps.get(keyStr)
+ " in " + BATCH_INTEGRATOR_CONFIG_FILE + " , but did not find a corresponding service type "
+ "in the internal table of service types.\n Ignoring this property then. Maybe this should have been set in batch-config.properties instead.");
removeThese.add(keyStr);
}
}
for (String s : removeThese) {
serviceIntegratorProps.remove(s);
}
Properties adminProps = new Properties();
InputStream batchAdminConfigListInputStream = this.getClass().getResourceAsStream("/META-INF/services/" + BATCH_ADMIN_CONFIG_FILE);
if (batchServicesListInputStream != null) {
try {
logger.config("Batch Admin Config File exists! loading it..");
adminProps.load(batchAdminConfigListInputStream);
batchAdminConfigListInputStream.close();
} catch (IOException e) {
logger.config("Error loading " + "/META-INF/services/" + BATCH_ADMIN_CONFIG_FILE + " IOException=" + e.toString());
} catch (Exception e) {
logger.config("Error loading " + "/META-INF/services/" + BATCH_ADMIN_CONFIG_FILE + " Exception=" + e.toString());
}
} else {
logger.config("Could not find batch admin config file: " + "/META-INF/services/" + BATCH_ADMIN_CONFIG_FILE);
}
// See if any DO map to service impls, which would be a mistake
Set removeTheseToo = new HashSet();
for (Object key : adminProps.keySet()) {
String keyStr = (String) key;
if (propertyNameTable.containsKey(keyStr)) {
logger.warning("Found property named: " + keyStr + " with value: " + adminProps.get(keyStr) + " in "
+ BATCH_ADMIN_CONFIG_FILE + " , but this is a batch runtime service configuration.\n"
+ "Ignoring this property then, since this should have been set in batch-services.properties instead.");
removeThese.add(keyStr);
}
}
for (String s : removeTheseToo) {
adminProps.remove(s);
}
// Merge the two into 'batchContainerProps'
batchContainerProps = new Properties();
batchContainerProps.putAll(adminProps);
batchContainerProps.putAll(serviceIntegratorProps);
}
private void readConfigFromSPI() {
//Merge in overrides from the SPI so the container can change properties
batchContainerProps.putAll(BatchSPIManager.getInstance().getBatchContainerOverrideProperties());
// Don't cache in the 'platformMode' field variable just yet, wait until config is complete for consistency.
PlatformMode mode = BatchSPIManager.getInstance().getPlatformMode();
if (mode != null) {
if (mode.equals(PlatformMode.EE)) {
logger.config("SPI configured platform selection of EE");
batchContainerProps.setProperty(ServiceTypes.J2SE_MODE, "false");
} else if (mode.equals(PlatformMode.SE)) {
logger.config("SPI configured platform selection of SE");
batchContainerProps.setProperty(ServiceTypes.J2SE_MODE, "true");
}
}
}
private void readConfigFromSystemProperties() {
batchContainerProps.putAll(ServiceRegistry.getSystemPropertyOverrides());
}
private void initBatchConfigImpl() {
logger.fine("Dumping contents of batchContainerProps after reading properties files and calling SPI.");
for (Object key : batchContainerProps.keySet()) {
logger.config("key = " + key);
logger.config("value = " + batchContainerProps.get(key));
}
// Set this on the config.
//
// WARNING: This sets us up for collisions since this is just a single holder of properties
// potentially used by any service impl.
batchConfigImpl.setConfigProperties(batchContainerProps);
}
/**
* The method name reflects the fact that we have default service impl classnames baked into
* the runtime that will be used in the absence of any config property. The config is only
* necessary to 'override' one of these default impls.
*/
private void initServiceImplOverrides() {
// For each property we care about (i.e that defines one of our service impls)
for (String propKey : propertyNameTable.keySet()) {
// If the property is defined
String value = batchContainerProps.getProperty(propKey);
if (value != null) {
// Get the corresponding serviceType enum and store the value of
// the key/value property pair in the table where we store the service impl classnames.
Name serviceType = propertyNameTable.get(propKey);
String defaultServiceImplClassName = serviceImplClassNames.get(serviceType); // For logging.
serviceImplClassNames.put(serviceType, value.trim());
logger.config("Overriding serviceType: " + serviceType + ", replacing default impl classname: " +
defaultServiceImplClassName + " with override impl class name: " + value.trim());
}
}
}
private void initDatabaseConfig() {
if (databaseConfigBean == null) {
logger.config("First try to load 'suggested config' from BatchSPIManager");
databaseConfigBean = BatchSPIManager.getInstance().getFinalDatabaseConfiguration();
if (databaseConfigBean == null) {
logger.config("Loading database config from configuration properties file.");
// Initialize database-related properties
databaseConfigBean = new DatabaseConfigurationBean();
databaseConfigBean.setJndiName(batchContainerProps.getProperty(JNDI_NAME, DEFAULT_JDBC_JNDI_NAME));
databaseConfigBean.setJdbcDriver(batchContainerProps.getProperty(JDBC_DRIVER, DEFAULT_JDBC_DRIVER));
databaseConfigBean.setJdbcUrl(batchContainerProps.getProperty(JDBC_URL, DEFAULT_JDBC_URL));
databaseConfigBean.setDbUser(batchContainerProps.getProperty(DB_USER));
databaseConfigBean.setDbPassword(batchContainerProps.getProperty(DB_PASSWORD));
databaseConfigBean.setSchema(batchContainerProps.getProperty(DB_SCHEMA, DEFAULT_DB_SCHEMA));
}
} else {
// Currently we do not expected this path to be used by Glassfish
logger.config("Database config has been set directly from SPI, do NOT load from properties file.");
}
// In either case, set this bean on the main config bean
batchConfigImpl.setDatabaseConfigurationBean(databaseConfigBean);
}
// Push hardened config value onto batchConfigImpl and cache the value in a field.
private void initPlatformSEorEE() {
String seMode = serviceImplClassNames.get(Name.JAVA_EDITION_IS_SE_DUMMY_SERVICE);
if (seMode.equalsIgnoreCase("true")) {
platformMode = PlatformMode.SE;
batchConfigImpl.setJ2seMode(true);
} else {
platformMode = PlatformMode.EE;
batchConfigImpl.setJ2seMode(false);
}
}
// Look up registry and return requested service if exist
// If not exist, create a new one, add to registry and return that one
private IBatchServiceBase getService(Name serviceType) throws BatchContainerServiceException {
String sourceMethod = "getService";
logger.entering(sourceClass, sourceMethod + ", serviceType=" + serviceType);
initIfNecessary();
IBatchServiceBase service = new ServiceLoader(serviceType).getService();
logger.exiting(sourceClass, sourceMethod);
return service;
}
/*
* public enum Name {
JAVA_EDITION_IS_SE_DUMMY_SERVICE,
TRANSACTION_SERVICE,
PERSISTENCE_MANAGEMENT_SERVICE,
JOB_STATUS_MANAGEMENT_SERVICE,
BATCH_THREADPOOL_SERVICE,
BATCH_KERNEL_SERVICE,
JOB_ID_MANAGEMENT_SERVICE,
CALLBACK_SERVICE,
JOBXML_LOADER_SERVICE, // Preferred
DELEGATING_JOBXML_LOADER_SERVICE, // Delegating wrapper
CONTAINER_ARTIFACT_FACTORY_SERVICE, // Preferred
DELEGATING_ARTIFACT_FACTORY_SERVICE // Delegating wrapper
*/
@Override
public ITransactionManagementService getTransactionManagementService() {
return (ITransactionManagementService)getService(Name.TRANSACTION_SERVICE);
}
@Override
public IPersistenceManagerService getPersistenceManagerService() {
return (IPersistenceManagerService)getService(Name.PERSISTENCE_MANAGEMENT_SERVICE);
}
@Override
public IJobStatusManagerService getJobStatusManagerService() {
return (IJobStatusManagerService)getService(Name.JOB_STATUS_MANAGEMENT_SERVICE);
}
@Override
public IBatchThreadPoolService getThreadPoolService() {
return (IBatchThreadPoolService)getService(Name.BATCH_THREADPOOL_SERVICE);
}
@Override
public IBatchKernelService getBatchKernelService() {
return (IBatchKernelService)getService(Name.BATCH_KERNEL_SERVICE);
}
@Override
public IJobEndCallbackService getJobCallbackService() {
return (IJobEndCallbackService)getService(Name.CALLBACK_SERVICE);
}
@Override
public IJobXMLLoaderService getPreferredJobXMLLoaderService() {
return (IJobXMLLoaderService)getService(Name.JOBXML_LOADER_SERVICE);
}
@Override
public IJobXMLLoaderService getDelegatingJobXMLLoaderService() {
return (IJobXMLLoaderService)getService(Name.DELEGATING_JOBXML_LOADER_SERVICE);
}
@Override
public IBatchArtifactFactory getPreferredArtifactFactory() {
return (IBatchArtifactFactory)getService(Name.CONTAINER_ARTIFACT_FACTORY_SERVICE);
}
@Override
public IBatchArtifactFactory getDelegatingArtifactFactory() {
return (IBatchArtifactFactory)getService(Name.DELEGATING_ARTIFACT_FACTORY_SERVICE);
}
/**
* Note this will always return a non-null platform mode, i.e. defaulting is
* taken care of.
*
* @return mode signifying whether we are executing on an SE or EE platform.
*/
@Override
public PlatformMode getPlatformMode() {
initIfNecessary();
return platformMode;
}
private class ServiceLoader {
volatile IBatchServiceBase service = null;
private Name serviceType = null;
private ServiceLoader(Name name) {
this.serviceType = name;
}
private IBatchServiceBase getService() {
service = serviceRegistry.get(serviceType);
if (service == null) {
// Probably don't want to be loading two on two different threads so lock the whole table.
synchronized (serviceRegistry) {
if (service == null) {
service = _loadServiceHelper(serviceType);
service.init(batchConfigImpl);
serviceRegistry.putIfAbsent(serviceType, service);
}
}
}
return service;
}
/**
* Try to load the service impl given by the className.
*/
private IBatchServiceBase _loadServiceHelper(Name serviceType) {
IBatchServiceBase service = null;
String className = serviceImplClassNames.get(serviceType);
try {
if (className != null) {
service = _loadService(className);
}
} catch (Throwable t) {
logger.log(Level.SEVERE, "Could not instantiate service: " + className + " due to exception:" + t);
throw new RuntimeException("Could not instantiate service " + className, t);
}
if (service == null) {
throw new RuntimeException("Instantiate of service=: " + className + " for serviceType: " + serviceType + " returned null. Aborting...");
}
return service;
}
private IBatchServiceBase _loadService(String className) throws Exception {
IBatchServiceBase service = null;
Class cls;
try {
cls = Class.forName(className);
} catch (ClassNotFoundException cnfe) {
cls = Thread.currentThread().getContextClassLoader().loadClass(className);
}
if (cls != null) {
Constructor ctor = cls.getConstructor();
if (ctor != null) {
service = (IBatchServiceBase) ctor.newInstance();
} else {
throw new Exception("Service class " + className + " should have a default constructor defined");
}
} else {
throw new Exception("Exception loading Service class " + className + " make sure it exists");
}
return service;
}
}
}
