/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* 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.epl.expression;
import com.espertech.esper.client.ConfigurationPlugInSingleRowFunction;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.epl.rettype.EPType;
import com.espertech.esper.epl.rettype.EPTypeHelper;
import com.espertech.esper.epl.core.EngineImportSingleRowDesc;
import com.espertech.esper.epl.enummethod.dot.ExprDotStaticMethodWrap;
import com.espertech.esper.epl.enummethod.dot.ExprDotStaticMethodWrapFactory;
import com.espertech.esper.filter.FilterSpecLookupable;
import com.espertech.esper.metrics.instrumentation.InstrumentationHelper;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
/**
* Represents an invocation of a plug-in single-row function in the expression tree.
*/
public class ExprPlugInSingleRowNode extends ExprNodeBase implements ExprNodeInnerNodeProvider, ExprFilterOptimizableNode
{
private static final long serialVersionUID = 2485214890449563098L;
private final String functionName;
private final Class clazz;
private final List<ExprChainedSpec> chainSpec;
private final EngineImportSingleRowDesc config;
private transient boolean isReturnsConstantResult;
private transient ExprEvaluator evaluator;
/**
* Ctor.
* @param chainSpec - the class and name of the method that this node will invoke plus parameters
*/
public ExprPlugInSingleRowNode(String functionName, Class clazz, List<ExprChainedSpec> chainSpec, EngineImportSingleRowDesc config)
{
this.functionName = functionName;
this.clazz = clazz;
this.chainSpec = chainSpec;
this.config = config;
}
public ExprEvaluator getExprEvaluator() {
return evaluator;
}
public List<ExprChainedSpec> getChainSpec()
{
return chainSpec;
}
@Override
public boolean isConstantResult()
{
return isReturnsConstantResult;
}
public String getFunctionName()
{
return functionName;
}
public boolean getFilterLookupEligible() {
// We disallow context properties in a filter-optimizable expression if they are passed in since
// the evaluation is context-free and shared.
ExprNodeContextPropertiesVisitor visitor = new ExprNodeContextPropertiesVisitor();
ExprNodeUtility.acceptChain(visitor, chainSpec);
return !visitor.isFound() &&
config.getFilterOptimizable() == ConfigurationPlugInSingleRowFunction.FilterOptimizable.ENABLED &&
chainSpec.size() == 1 &&
!isReturnsConstantResult;
}
public FilterSpecLookupable getFilterLookupable() {
ExprDotEvalStaticMethod eval = (ExprDotEvalStaticMethod) evaluator;
return new FilterSpecLookupable(ExprNodeUtility.toExpressionStringMinPrecedence(this), eval, evaluator.getType());
}
public void toPrecedenceFreeEPL(StringWriter writer) {
ExprNodeUtility.toExpressionString(chainSpec, writer, false, functionName);
}
public ExprPrecedenceEnum getPrecedence() {
return ExprPrecedenceEnum.UNARY;
}
public boolean equalsNode(ExprNode node)
{
if(!(node instanceof ExprPlugInSingleRowNode))
{
return false;
}
ExprPlugInSingleRowNode other = (ExprPlugInSingleRowNode) node;
if (other.chainSpec.size() != this.chainSpec.size()) {
return false;
}
for (int i = 0; i < chainSpec.size(); i++) {
if (!(this.chainSpec.get(i).equals(other.chainSpec.get(i)))) {
return false;
}
}
return other.clazz == this.clazz && other.functionName.endsWith(this.functionName);
}
public void validate(ExprValidationContext validationContext) throws ExprValidationException
{
ExprNodeUtility.validate(ExprNodeOrigin.PLUGINSINGLEROWPARAM, chainSpec, validationContext);
// get first chain item
List<ExprChainedSpec> chainList = new ArrayList<ExprChainedSpec>(chainSpec);
ExprChainedSpec firstItem = chainList.remove(0);
// Get the types of the parameters for the first invocation
boolean allowWildcard = validationContext.getStreamTypeService().getEventTypes().length == 1;
EventType streamZeroType = null;
if (validationContext.getStreamTypeService().getEventTypes().length > 0) {
streamZeroType = validationContext.getStreamTypeService().getEventTypes()[0];
}
final ExprNodeUtilMethodDesc staticMethodDesc = ExprNodeUtility.resolveMethodAllowWildcardAndStream(clazz.getName(), null, firstItem.getName(), firstItem.getParameters(), validationContext.getMethodResolutionService(), validationContext.getEventAdapterService(), validationContext.getStatementId(), allowWildcard, streamZeroType, new ExprNodeUtilResolveExceptionHandlerDefault(firstItem.getName(), true), functionName);
boolean allowValueCache = true;
if (config.getValueCache() == ConfigurationPlugInSingleRowFunction.ValueCache.DISABLED) {
isReturnsConstantResult = false;
allowValueCache = false;
}
else if (config.getValueCache() == ConfigurationPlugInSingleRowFunction.ValueCache.CONFIGURED) {
isReturnsConstantResult = validationContext.getMethodResolutionService().isUdfCache() && staticMethodDesc.isAllConstants() && chainList.isEmpty();
allowValueCache = validationContext.getMethodResolutionService().isUdfCache();
}
else if (config.getValueCache() == ConfigurationPlugInSingleRowFunction.ValueCache.ENABLED) {
isReturnsConstantResult = staticMethodDesc.isAllConstants() && chainList.isEmpty();
}
else {
throw new IllegalStateException("Invalid value cache code " + config.getValueCache());
}
// this may return a pair of null if there is no lambda or the result cannot be wrapped for lambda-function use
ExprDotStaticMethodWrap optionalLambdaWrap = ExprDotStaticMethodWrapFactory.make(staticMethodDesc.getReflectionMethod(), validationContext.getEventAdapterService(), chainList);
EPType typeInfo = optionalLambdaWrap != null ? optionalLambdaWrap.getTypeInfo() : EPTypeHelper.singleValue(staticMethodDesc.getReflectionMethod().getReturnType());
ExprDotEval[] eval = ExprDotNodeUtility.getChainEvaluators(-1, typeInfo, chainList, validationContext, false, new ExprDotNodeFilterAnalyzerInputStatic()).getChainWithUnpack();
evaluator = new ExprDotEvalStaticMethod(validationContext.getStatementName(), clazz.getName(), staticMethodDesc.getFastMethod(), staticMethodDesc.getChildEvals(), allowValueCache && staticMethodDesc.isAllConstants(), optionalLambdaWrap, eval, config.isRethrowExceptions(), null);
// If caching the result, evaluate now and return the result.
if (isReturnsConstantResult) {
final Object result = evaluator.evaluate(null, true, null);
evaluator = new ExprEvaluator() {
public Object evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) {
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().qExprPlugInSingleRow(staticMethodDesc.getReflectionMethod());
InstrumentationHelper.get().aExprPlugInSingleRow(result);
}
return result;
}
public Class getType() {
return staticMethodDesc.getFastMethod().getReturnType();
}
};
}
}
@Override
public void accept(ExprNodeVisitor visitor) {
super.accept(visitor);
ExprNodeUtility.acceptChain(visitor, chainSpec);
}
@Override
public void accept(ExprNodeVisitorWithParent visitor) {
super.accept(visitor);
ExprNodeUtility.acceptChain(visitor, chainSpec, this);
}
@Override
public void acceptChildnodes(ExprNodeVisitorWithParent visitor, ExprNode parent) {
super.acceptChildnodes(visitor, parent);
ExprNodeUtility.acceptChain(visitor, chainSpec, this);
}
@Override
public void replaceUnlistedChildNode(ExprNode nodeToReplace, ExprNode newNode) {
ExprNodeUtility.replaceChainChildNode(nodeToReplace, newNode, chainSpec);
}
public List<ExprNode> getAdditionalNodes() {
return ExprNodeUtility.collectChainParameters(chainSpec);
}
}