/**
* 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.builder;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.Future;
import java.util.function.Consumer;
import java.util.function.Supplier;
import org.apache.camel.CamelContext;
import org.apache.camel.CamelExecutionException;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.FluentProducerTemplate;
import org.apache.camel.Message;
import org.apache.camel.Processor;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.processor.ConvertBodyProcessor;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.ExchangeHelper;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.ServiceHelper;
public class DefaultFluentProducerTemplate extends ServiceSupport implements FluentProducerTemplate {
private final CamelContext context;
private final ClassValue<ConvertBodyProcessor> resultProcessors;
private Map<String, Object> headers;
private Object body;
private Optional<Consumer<ProducerTemplate>> templateCustomizer;
private Optional<Supplier<Exchange>> exchangeSupplier;
private Optional<Supplier<Processor>> processorSupplier;
private Optional<Endpoint> endpoint;
private Optional<Endpoint> defaultEndpoint;
private int maximumCacheSize;
private boolean eventNotifierEnabled;
private volatile ProducerTemplate template;
public DefaultFluentProducerTemplate(CamelContext context) {
this.context = context;
this.endpoint = Optional.empty();
this.defaultEndpoint = Optional.empty();
this.eventNotifierEnabled = true;
this.templateCustomizer = Optional.empty();
this.exchangeSupplier = Optional.empty();
this.processorSupplier = Optional.empty();
this.resultProcessors = new ClassValue<ConvertBodyProcessor>() {
@Override
protected ConvertBodyProcessor computeValue(Class<?> type) {
return new ConvertBodyProcessor(type);
}
};
}
@Override
public CamelContext getCamelContext() {
return context;
}
@Override
public int getCurrentCacheSize() {
if (template == null) {
return 0;
}
return template.getCurrentCacheSize();
}
@Override
public void cleanUp() {
if (template != null) {
template.cleanUp();
}
}
@Override
public void setDefaultEndpointUri(String endpointUri) {
setDefaultEndpoint(getCamelContext().getEndpoint(endpointUri));
}
@Override
public Endpoint getDefaultEndpoint() {
return defaultEndpoint.orElse(null);
}
@Override
public void setDefaultEndpoint(Endpoint defaultEndpoint) {
this.defaultEndpoint = Optional.of(defaultEndpoint);
}
@Override
public int getMaximumCacheSize() {
return maximumCacheSize;
}
@Override
public void setMaximumCacheSize(int maximumCacheSize) {
this.maximumCacheSize = maximumCacheSize;
}
@Override
public boolean isEventNotifierEnabled() {
return eventNotifierEnabled;
}
@Override
public void setEventNotifierEnabled(boolean eventNotifierEnabled) {
this.eventNotifierEnabled = eventNotifierEnabled;
}
@Override
public FluentProducerTemplate withHeader(String key, Object value) {
if (headers == null) {
headers = new HashMap<>();
}
headers.put(key, value);
return this;
}
@Override
public FluentProducerTemplate clearHeaders() {
if (headers != null) {
headers.clear();
}
return this;
}
@Override
public FluentProducerTemplate withBody(Object body) {
this.body = body;
return this;
}
@Override
public FluentProducerTemplate withBodyAs(Object body, Class<?> type) {
this.body = type != null
? context.getTypeConverter().convertTo(type, body)
: body;
return this;
}
@Override
public FluentProducerTemplate clearBody() {
this.body = null;
return this;
}
@Override
public FluentProducerTemplate withTemplateCustomizer(final Consumer<ProducerTemplate> templateCustomizer) {
this.templateCustomizer = Optional.of(templateCustomizer);
return this;
}
@Override
public FluentProducerTemplate withExchange(final Exchange exchange) {
return withExchange(() -> exchange);
}
@Override
public FluentProducerTemplate withExchange(final Supplier<Exchange> exchangeSupplier) {
this.exchangeSupplier = Optional.of(exchangeSupplier);
return this;
}
@Override
public FluentProducerTemplate withProcessor(final Processor processor) {
return withProcessor(() -> processor);
}
@Override
public FluentProducerTemplate withProcessor(final Supplier<Processor> processorSupplier) {
this.processorSupplier = Optional.of(processorSupplier);
return this;
}
@Override
public FluentProducerTemplate to(String endpointUri) {
return to(context.getEndpoint(endpointUri));
}
@Override
public FluentProducerTemplate to(Endpoint endpoint) {
this.endpoint = Optional.of(endpoint);
return this;
}
// ************************
// REQUEST
// ************************
@Override
public Object request() throws CamelExecutionException {
return request(Object.class);
}
@Override
@SuppressWarnings("unchecked")
public <T> T request(Class<T> type) throws CamelExecutionException {
// Determine the target endpoint
final Endpoint target = target();
// Create the default processor if not provided.
final Supplier<Processor> processorSupplier = this.processorSupplier.orElse(() -> defaultProcessor());
T result;
if (type == Exchange.class) {
result = (T)template().request(target, processorSupplier.get());
} else if (type == Message.class) {
Exchange exchange = template().request(target, processorSupplier.get());
result = exchange.hasOut() ? (T)exchange.getOut() : (T)exchange.getIn();
} else {
Exchange exchange = template().send(
target,
ExchangePattern.InOut,
processorSupplier.get(),
resultProcessors.get(type)
);
result = context.getTypeConverter().convertTo(
type,
ExchangeHelper.extractResultBody(exchange, exchange.getPattern())
);
}
return result;
}
@Override
public Future<Object> asyncRequest() {
return asyncRequest(Object.class);
}
@Override
public <T> Future<T> asyncRequest(Class<T> type) {
// Determine the target endpoint
final Endpoint target = target();
Future<T> result;
if (ObjectHelper.isNotEmpty(headers)) {
// Make a copy of the headers and body so that async processing won't
// be invalidated by subsequent reuse of the template
final Map<String, Object> headersCopy = new HashMap<>(headers);
final Object bodyCopy = body;
result = template().asyncRequestBodyAndHeaders(target, bodyCopy, headersCopy, type);
} else {
// Make a copy of the and body so that async processing won't be
// invalidated by subsequent reuse of the template
final Object bodyCopy = body;
result = template().asyncRequestBody(target, bodyCopy, type);
}
return result;
}
// ************************
// SEND
// ************************
@Override
public Exchange send() throws CamelExecutionException {
// Determine the target endpoint
final Endpoint target = target();
return exchangeSupplier.isPresent()
? template().send(target, exchangeSupplier.get().get())
: template().send(target, processorSupplier.orElse(() -> defaultProcessor()).get());
}
@Override
public Future<Exchange> asyncSend() {
// Determine the target endpoint
final Endpoint target = target();
return exchangeSupplier.isPresent()
? template().asyncSend(target, exchangeSupplier.get().get())
: template().asyncSend(target, processorSupplier.orElse(() -> defaultAsyncProcessor()).get());
}
// ************************
// HELPERS
// ************************
/**
* Create the FluentProducerTemplate by setting the camel context
*
* @param context the camel context
*/
public static FluentProducerTemplate on(CamelContext context) {
return new DefaultFluentProducerTemplate(context);
}
private ProducerTemplate template() {
ObjectHelper.notNull(context, "CamelContext");
if (template == null) {
template = maximumCacheSize > 0 ? context.createProducerTemplate(maximumCacheSize) : context.createProducerTemplate();
defaultEndpoint.ifPresent(template::setDefaultEndpoint);
template.setEventNotifierEnabled(eventNotifierEnabled);
templateCustomizer.ifPresent(tc -> tc.accept(template));
}
return template;
}
private Processor defaultProcessor() {
return exchange -> {
ObjectHelper.ifNotEmpty(headers, exchange.getIn().getHeaders()::putAll);
ObjectHelper.ifNotEmpty(body, exchange.getIn()::setBody);
};
}
private Processor defaultAsyncProcessor() {
final Map<String, Object> headersCopy = ObjectHelper.isNotEmpty(this.headers) ? new HashMap<>(this.headers) : null;
final Object bodyCopy = this.body;
return exchange -> {
ObjectHelper.ifNotEmpty(headersCopy, exchange.getIn().getHeaders()::putAll);
ObjectHelper.ifNotEmpty(bodyCopy, exchange.getIn()::setBody);
};
}
private Endpoint target() {
if (endpoint.isPresent()) {
return endpoint.get();
}
if (defaultEndpoint.isPresent()) {
return defaultEndpoint.get();
}
throw new IllegalArgumentException("No endpoint configured on FluentProducerTemplate. You can configure an endpoint with to(uri)");
}
@Override
protected void doStart() throws Exception {
if (template == null) {
template = template();
}
ServiceHelper.startService(template);
}
@Override
protected void doStop() throws Exception {
ServiceHelper.stopService(template);
}
}