/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.core.context.mgr;
import com.espertech.esper.client.EventType;
import com.espertech.esper.client.hook.ExceptionHandlerExceptionType;
import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.core.context.util.ContextDescriptor;
import com.espertech.esper.core.service.EPServicesContext;
import com.espertech.esper.core.service.ExceptionHandlingService;
import com.espertech.esper.epl.expression.core.ExprValidationException;
import com.espertech.esper.epl.spec.CreateContextDesc;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class ContextManagementServiceImpl implements ContextManagementService {
private static final Logger log = LoggerFactory.getLogger(ContextManagementServiceImpl.class);
private final Map<String, ContextManagerEntry> contexts;
private final Set<String> destroyedContexts = new HashSet<String>();
public ContextManagementServiceImpl() {
contexts = new HashMap<String, ContextManagerEntry>();
}
public void addContextSpec(EPServicesContext servicesContext, AgentInstanceContext agentInstanceContext, CreateContextDesc contextDesc, boolean isRecoveringResilient, EventType statementResultEventType) throws ExprValidationException {
ContextManagerEntry mgr = contexts.get(contextDesc.getContextName());
if (mgr != null) {
if (destroyedContexts.contains(contextDesc.getContextName())) {
throw new ExprValidationException("Context by name '" + contextDesc.getContextName() + "' is still referenced by statements and may not be changed");
}
throw new ExprValidationException("Context by name '" + contextDesc.getContextName() + "' already exists");
}
ContextControllerFactoryServiceContext factoryServiceContext = new ContextControllerFactoryServiceContext(contextDesc.getContextName(), servicesContext, contextDesc.getContextDetail(), agentInstanceContext, isRecoveringResilient, statementResultEventType);
ContextManager contextManager = servicesContext.getContextManagerFactoryService().make(contextDesc.getContextDetail(), factoryServiceContext);
factoryServiceContext.getAgentInstanceContextCreate().getEpStatementAgentInstanceHandle().setFilterFaultHandler(contextManager);
contexts.put(contextDesc.getContextName(), new ContextManagerEntry(contextManager));
}
public int getContextCount() {
return contexts.size();
}
public ContextDescriptor getContextDescriptor(String contextName) {
ContextManagerEntry entry = contexts.get(contextName);
if (entry == null) {
return null;
}
return entry.getContextManager().getContextDescriptor();
}
public ContextManager getContextManager(String contextName) {
ContextManagerEntry entry = contexts.get(contextName);
if (entry == null) {
return null;
}
return entry.getContextManager();
}
public void addStatement(String contextName, ContextControllerStatementBase statement, boolean isRecoveringResilient) throws ExprValidationException {
ContextManagerEntry entry = contexts.get(contextName);
if (entry == null) {
throw new ExprValidationException(getNotDecaredText(contextName));
}
entry.addStatement(statement.getStatementContext().getStatementId());
entry.getContextManager().addStatement(statement, isRecoveringResilient);
}
public void destroyedStatement(String contextName, String statementName, int statementId) {
ContextManagerEntry entry = contexts.get(contextName);
if (entry == null) {
log.warn("Destroy statement for statement '" + statementName + "' failed to locate corresponding context manager '" + contextName + "'");
return;
}
entry.removeStatement(statementId);
entry.getContextManager().destroyStatement(statementName, statementId);
if (entry.getStatementCount() == 0 && destroyedContexts.contains(contextName)) {
destroyContext(contextName, entry);
}
}
public void stoppedStatement(String contextName, String statementName, int statementId, String epl, ExceptionHandlingService exceptionHandlingService) {
ContextManagerEntry entry = contexts.get(contextName);
if (entry == null) {
log.warn("Stop statement for statement '" + statementName + "' failed to locate corresponding context manager '" + contextName + "'");
return;
}
try {
entry.getContextManager().stopStatement(statementName, statementId);
} catch (RuntimeException ex) {
exceptionHandlingService.handleException(ex, statementName, epl, ExceptionHandlerExceptionType.STOP, null);
}
}
public void destroyedContext(String contextName) {
ContextManagerEntry entry = contexts.get(contextName);
if (entry == null) {
log.warn("Destroy for context '" + contextName + "' failed to locate corresponding context manager '" + contextName + "'");
return;
}
if (entry.getStatementCount() == 0) {
destroyContext(contextName, entry);
} else {
// some remaining statements have references
destroyedContexts.add(contextName);
}
}
public Map<String, ContextManagerEntry> getContexts() {
return contexts;
}
private void destroyContext(String contextName, ContextManagerEntry entry) {
entry.getContextManager().safeDestroy();
contexts.remove(contextName);
destroyedContexts.remove(contextName);
}
private String getNotDecaredText(String contextName) {
return "Context by name '" + contextName + "' has not been declared";
}
}