/*
* Copyright 2002-2013 the original author or authors.
*
* 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 org.springframework.data.gemfire.function;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.execute.FunctionContext;
import org.apache.geode.cache.execute.RegionFunctionContext;
import org.apache.geode.cache.execute.ResultSender;
import org.apache.geode.cache.partition.PartitionRegionHelper;
import org.springframework.data.gemfire.function.annotation.Filter;
import org.springframework.data.gemfire.function.annotation.RegionData;
import org.springframework.data.gemfire.util.ArrayUtils;
import org.springframework.util.Assert;
/**
* @author David Turanski
* @since 1.3.0
*
*/
class FunctionContextInjectingArgumentResolver extends PdxFunctionArgumentResolver {
private static final Log logger = LogFactory.getLog(FunctionContextInjectingArgumentResolver.class);
private final int filterParameterPosition;
private final int functionContextParameterPosition;
private final int regionParameterPosition;
private final int resultSenderParameterPosition;
private final Method method;
public FunctionContextInjectingArgumentResolver(Method method) {
this.method = method;
int regionDataAnnotationParameterPosition = GemfireFunctionUtils.getAnnotationParameterPosition(
method, RegionData.class, new Class[] { Map.class });
int regionTypeParameterPosition = getArgumentTypePosition(method, Region.class);
if (regionDataAnnotationParameterPosition >= 0 && regionTypeParameterPosition >= 0) {
Assert.isTrue(regionDataAnnotationParameterPosition == regionTypeParameterPosition, String.format(
"Function method signature for method %s cannot contain an @RegionData parameter and a different Region type parameter",
method.getName()));
}
regionParameterPosition = (regionDataAnnotationParameterPosition >= 0 ? regionDataAnnotationParameterPosition
: (regionTypeParameterPosition >= 0 ? regionTypeParameterPosition : -1));
filterParameterPosition = GemfireFunctionUtils.getAnnotationParameterPosition(method, Filter.class,
new Class[] { Set.class });
if (regionParameterPosition >= 0 && filterParameterPosition >= 0) {
Assert.state(regionParameterPosition != filterParameterPosition,
"region parameter and filter parameter must be different");
}
functionContextParameterPosition = getArgumentTypePosition(method, FunctionContext.class);
resultSenderParameterPosition = getArgumentTypePosition(method, ResultSender.class);
}
@Override
public Method getFunctionAnnotatedMethod() {
return method;
}
@Override
public Object[] resolveFunctionArguments(FunctionContext functionContext) {
Object[] args = super.resolveFunctionArguments(functionContext);
if (functionContext instanceof RegionFunctionContext) {
if (this.regionParameterPosition >= 0) {
args = ArrayUtils.insert(args, regionParameterPosition, getRegionForContext(
(RegionFunctionContext) functionContext));
}
if (this.filterParameterPosition >= 0) {
args = ArrayUtils.insert(args, filterParameterPosition,
((RegionFunctionContext) functionContext).getFilter());
}
}
if (this.functionContextParameterPosition >= 0) {
args = ArrayUtils.insert(args, functionContextParameterPosition, functionContext);
}
if (this.resultSenderParameterPosition >= 0) {
args = ArrayUtils.insert(args, resultSenderParameterPosition, functionContext.getResultSender());
}
Assert.isTrue(args.length == method.getParameterTypes().length, String.format(
"wrong number of arguments for method %s. Expected %d, but was %d", method.getName(),
method.getParameterTypes().length, args.length));
return args;
}
/*
* (non-Javadoc)
* @see org.apache.geode.cache.execute.RegionFunctionContext
*/
private static Region<?, ?> getRegionForContext(RegionFunctionContext regionFunctionContext) {
Region<?, ?> region = regionFunctionContext.getDataSet();
if (PartitionRegionHelper.isPartitionedRegion(region)) {
if (logger.isDebugEnabled()) {
logger.debug("this is a partitioned region - filtering local data for context");
}
region = PartitionRegionHelper.getLocalDataForContext(regionFunctionContext);
}
if (logger.isDebugEnabled()) {
logger.debug("region contains " + region.size() + " items");
}
return region;
}
/*
* (non-Javadoc)
*/
private static int getArgumentTypePosition(Method method, Class<?> requiredType) {
int index = 0;
int position = -1;
for (Class<?> parameterType : method.getParameterTypes()) {
if (requiredType.equals(parameterType)) {
Assert.state(position < 0, String.format(
"Method %s signature cannot contain more than one parameter of type %s.",
method.getName(), requiredType.getName()));
position = index;
}
index++;
}
return position;
}
}