/*
* Copyright 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.xd.analytics.metrics.integration;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.transformer.MessageTransformationException;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import org.springframework.xd.analytics.metrics.core.FieldValueCounterRepository;
import org.springframework.xd.tuple.Tuple;
import org.springframework.xd.tuple.integration.JsonToTupleTransformer;
/**
* Counts the occurrence of values for a set of JavaBean properties or Tuple fields using a FieldValueCounterService.
* Assumes a String payload is JSON and will convert it to a Tuple.
*
* @author Mark Pollack
* @author David Turanski
* @author Mark Fisher
*/
public class FieldValueCounterHandler {
private final FieldValueCounterRepository fieldValueCounterRepository;
private final String fieldName;
private final String counterName;
private final JsonToTupleTransformer jsonToTupleTransformer;
public FieldValueCounterHandler(FieldValueCounterRepository fieldValueCounterRepository, String counterName,
String fieldName) {
Assert.notNull(fieldValueCounterRepository, "FieldValueCounterRepository can not be null");
Assert.notNull(counterName, "Counter name can not be null");
Assert.hasText(fieldName, "Field name can not be null or empty string");
this.fieldValueCounterRepository = fieldValueCounterRepository;
this.fieldName = fieldName;
this.counterName = counterName;
this.jsonToTupleTransformer = new JsonToTupleTransformer();
}
@ServiceActivator
public Message<?> process(Message<?> message) {
Object payload = message.getPayload();
if (payload instanceof String) {
try {
payload = jsonToTupleTransformer.transformPayload(payload.toString());
}
catch (Exception e) {
throw new MessageTransformationException(message, e);
}
}
if (payload instanceof Tuple) {
processTuple((Tuple) payload);
}
else {
processPojo(payload);
}
return message;
}
private void processPojo(Object payload) {
BeanWrapper beanWrapper = new BeanWrapperImpl(payload);
if (beanWrapper.isReadableProperty(fieldName)) {
Object value = beanWrapper.getPropertyValue(fieldName);
processValue(counterName, value);
}
}
private void processTuple(Tuple tuple) {
String[] path = StringUtils.tokenizeToStringArray(fieldName, ".");
processValueForCounter(counterName, tuple, path);
}
private void processValueForCounter(String counterName, Object value, String[] path) {
String key = path[0];
Object result = null;
if (value instanceof List) {
for (Object item : (List<?>) value) {
processValueForCounter(counterName, item, path);
}
}
else if (value instanceof Tuple) {
Tuple t = (Tuple) value;
if (t.hasFieldName(key)) {
result = t.getValue(key);
}
}
else if (value instanceof Map) {
result = ((Map<?, ?>) value).get(key);
}
if (result != null) {
if (path.length == 1) {
processValue(counterName, result);
}
else {
path = Arrays.copyOfRange(path, 1, path.length);
processValueForCounter(counterName, result, path);
}
}
}
protected void processValue(String counterName, Object value) {
if ((value instanceof Collection) || ObjectUtils.isArray(value)) {
Collection<?> c = (value instanceof Collection) ? (Collection<?>) value
: Arrays.asList(ObjectUtils.toObjectArray(value));
for (Object val : c) {
// TODO better conversion to a string
fieldValueCounterRepository.increment(counterName, val.toString());
}
}
else {
fieldValueCounterRepository.increment(counterName, value.toString());
}
}
}