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The Core Camel Java DSL based router
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.camel.util.component;
import java.lang.reflect.Array;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.camel.Exchange;
import org.apache.camel.impl.DefaultConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utility class for API Consumers.
*/
public final class ApiConsumerHelper {
private static final Logger LOG = LoggerFactory.getLogger(ApiConsumerHelper.class);
private ApiConsumerHelper() {
}
/**
* Utility method to find matching API Method for supplied endpoint's configuration properties.
* @param endpoint endpoint for configuration properties.
* @param propertyNamesInterceptor names interceptor for adapting property names, usually the consumer class itself.
* @param ApiName enumeration.
* @param Component configuration class.
* @return matching ApiMethod.
*/
public static & ApiName, T> ApiMethod findMethod(
AbstractApiEndpoint endpoint, PropertyNamesInterceptor propertyNamesInterceptor) {
ApiMethod result;
// find one that takes the largest subset of endpoint parameters
final Set argNames = new HashSet();
argNames.addAll(endpoint.getEndpointPropertyNames());
propertyNamesInterceptor.interceptPropertyNames(argNames);
final String[] argNamesArray = argNames.toArray(new String[argNames.size()]);
List filteredMethods = endpoint.methodHelper.filterMethods(
endpoint.getCandidates(), ApiMethodHelper.MatchType.SUPER_SET, argNamesArray);
if (filteredMethods.isEmpty()) {
ApiMethodHelper methodHelper = endpoint.getMethodHelper();
throw new IllegalArgumentException(
String.format("Missing properties for %s/%s, need one or more from %s",
endpoint.getApiName().getName(), endpoint.getMethodName(),
methodHelper.getMissingProperties(endpoint.getMethodName(), argNames)));
} else if (filteredMethods.size() == 1) {
// single match
result = filteredMethods.get(0);
} else {
result = ApiMethodHelper.getHighestPriorityMethod(filteredMethods);
LOG.warn(String.format("Using highest priority operation %s from operations %s for endpoint %s",
result, filteredMethods, endpoint.getEndpointUri()));
}
return result;
}
/**
* Utility method for Consumers to process API method invocation result.
* @param consumer Consumer that wants to process results.
* @param result result of API method invocation.
* @param splitResult true if the Consumer wants to split result using {@link org.apache.camel.util.component.ResultInterceptor#splitResult(Object)} method.
* @param Consumer class that extends DefaultConsumer and implements {@link org.apache.camel.util.component.ResultInterceptor}.
* @return number of result exchanges processed.
* @throws Exception on error.
*/
public static int getResultsProcessed(
T consumer, Object result, boolean splitResult) throws Exception {
// process result according to type
if (result != null && splitResult) {
// try to split the result
final Object resultArray = consumer.splitResult(result);
if (resultArray != result && resultArray.getClass().isArray()) {
// create an exchange for every element
final int length = Array.getLength(resultArray);
for (int i = 0; i < length; i++) {
processResult(consumer, result, Array.get(resultArray, i));
}
return length;
}
}
processResult(consumer, result, result);
return 1; // number of messages polled
}
private static void processResult(T consumer, Object methodResult, Object result)
throws Exception {
Exchange exchange = consumer.getEndpoint().createExchange();
exchange.getIn().setBody(result);
consumer.interceptResult(methodResult, exchange);
try {
// send message to next processor in the route
consumer.getProcessor().process(exchange);
} finally {
// log exception if an exception occurred and was not handled
final Exception exception = exchange.getException();
if (exception != null) {
consumer.getExceptionHandler().handleException("Error processing exchange", exchange, exception);
}
}
}
}