/*
* Copyright 2015 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.cloud.stream.module.metrics;
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.beans.factory.annotation.Autowired;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Sink;
import org.springframework.tuple.Tuple;
import org.springframework.integration.tuple.JsonToTupleTransformer;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.transformer.MessageTransformationException;
import org.springframework.messaging.Message;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* @author Mark Pollack
* @author David Turanski
* @author Mark Fisher
* @author Ilayaperumal Gopinathan
*/
@EnableBinding(Sink.class)
public class FieldValueCounterSink {
@Autowired
private FieldValueCounterSinkProperties fvcSinkProperties;
@Autowired
private FieldValueCounterWriter fieldValueCounterWriter;
private final JsonToTupleTransformer jsonToTupleTransformer = new JsonToTupleTransformer();
@ServiceActivator(inputChannel=Sink.INPUT)
public void 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.getMessage(), e);
}
}
if (payload instanceof Tuple) {
processTuple(computeMetricName(message), (Tuple) payload);
}
else {
processPojo(computeMetricName(message), payload);
}
}
private void processPojo(String counterName, Object payload) {
BeanWrapper beanWrapper = new BeanWrapperImpl(payload);
if (beanWrapper.isReadableProperty(fvcSinkProperties.getFieldName())) {
Object value = beanWrapper.getPropertyValue(fvcSinkProperties.getFieldName());
processValue(counterName, value);
}
}
private void processTuple(String counterName, Tuple tuple) {
String[] path = StringUtils.tokenizeToStringArray(fvcSinkProperties.getFieldName(), ".");
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) {
fieldValueCounterWriter.increment(counterName, val.toString(), 1.0);
}
}
else {
fieldValueCounterWriter.increment(counterName, value.toString(), 1.0);
}
}
protected String computeMetricName(Message<?> message) {
return fvcSinkProperties.getComputedNameExpression().getValue(message, CharSequence.class).toString();
}
}