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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;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.apache.camel.CamelContext;
import org.apache.camel.DelegateEndpoint;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.Message;
import org.apache.camel.PollingConsumer;
import org.apache.camel.Processor;
import org.apache.camel.ResolveEndpointFailedException;
import org.apache.camel.Route;
import org.apache.camel.runtimecatalog.DefaultRuntimeCamelCatalog;
import org.apache.camel.runtimecatalog.RuntimeCamelCatalog;
import org.apache.camel.spi.BrowsableEndpoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.camel.util.ObjectHelper.after;
/**
* Some helper methods for working with {@link Endpoint} instances
*/
public final class EndpointHelper {
private static final Logger LOG = LoggerFactory.getLogger(EndpointHelper.class);
private static final AtomicLong ENDPOINT_COUNTER = new AtomicLong(0);
private static final Pattern SYNTAX_PATTERN = Pattern.compile("(\\w+)");
private EndpointHelper() {
//Utility Class
}
/**
* Creates a {@link PollingConsumer} and polls all pending messages on the endpoint
* and invokes the given {@link Processor} to process each {@link Exchange} and then closes
* down the consumer and throws any exceptions thrown.
*/
public static void pollEndpoint(Endpoint endpoint, Processor processor, long timeout) throws Exception {
PollingConsumer consumer = endpoint.createPollingConsumer();
try {
ServiceHelper.startService(consumer);
while (true) {
Exchange exchange = consumer.receive(timeout);
if (exchange == null) {
break;
} else {
processor.process(exchange);
}
}
} finally {
try {
ServiceHelper.stopAndShutdownService(consumer);
} catch (Exception e) {
LOG.warn("Failed to stop PollingConsumer: " + consumer + ". This example is ignored.", e);
}
}
}
/**
* Creates a {@link PollingConsumer} and polls all pending messages on the
* endpoint and invokes the given {@link Processor} to process each
* {@link Exchange} and then closes down the consumer and throws any
* exceptions thrown.
*/
public static void pollEndpoint(Endpoint endpoint, Processor processor) throws Exception {
pollEndpoint(endpoint, processor, 1000L);
}
/**
* Matches the endpoint with the given pattern.
*
* The endpoint will first resolve property placeholders using {@link CamelContext#resolvePropertyPlaceholders(String)}.
*
* The match rules are applied in this order:
*
* - exact match, returns true
* - wildcard match (pattern ends with a * and the uri starts with the pattern), returns true
* - regular expression match, returns true
* - otherwise returns false
*
*
* @param context the Camel context, if null then property placeholder resolution is skipped.
* @param uri the endpoint uri
* @param pattern a pattern to match
* @return true if match, false otherwise.
*/
public static boolean matchEndpoint(CamelContext context, String uri, String pattern) {
if (context != null) {
try {
uri = context.resolvePropertyPlaceholders(uri);
} catch (Exception e) {
throw new ResolveEndpointFailedException(uri, e);
}
}
// normalize uri so we can do endpoint hits with minor mistakes and parameters is not in the same order
try {
uri = URISupport.normalizeUri(uri);
} catch (Exception e) {
throw new ResolveEndpointFailedException(uri, e);
}
// we need to test with and without scheme separators (//)
if (uri.contains("://")) {
// try without :// also
String scheme = ObjectHelper.before(uri, "://");
String path = after(uri, "://");
if (matchPattern(scheme + ":" + path, pattern)) {
return true;
}
} else {
// try with :// also
String scheme = ObjectHelper.before(uri, ":");
String path = after(uri, ":");
if (matchPattern(scheme + "://" + path, pattern)) {
return true;
}
}
// and fallback to test with the uri as is
return matchPattern(uri, pattern);
}
/**
* Matches the endpoint with the given pattern.
*
* @see #matchEndpoint(org.apache.camel.CamelContext, String, String)
* @deprecated use {@link #matchEndpoint(org.apache.camel.CamelContext, String, String)} instead.
*/
@Deprecated
public static boolean matchEndpoint(String uri, String pattern) {
return matchEndpoint(null, uri, pattern);
}
/**
* Matches the name with the given pattern.
*
* The match rules are applied in this order:
*
* - exact match, returns true
* - wildcard match (pattern ends with a * and the name starts with the pattern), returns true
* - regular expression match, returns true
* - otherwise returns false
*
*
* @param name the name
* @param pattern a pattern to match
* @return true if match, false otherwise.
*/
public static boolean matchPattern(String name, String pattern) {
if (name == null || pattern == null) {
return false;
}
if (name.equals(pattern)) {
// exact match
return true;
}
if (matchWildcard(name, pattern)) {
return true;
}
if (matchRegex(name, pattern)) {
return true;
}
// no match
return false;
}
/**
* Matches the name with the given pattern.
*
* The match rules are applied in this order:
*
* - wildcard match (pattern ends with a * and the name starts with the pattern), returns true
* - otherwise returns false
*
*
* @param name the name
* @param pattern a pattern to match
* @return true if match, false otherwise.
*/
private static boolean matchWildcard(String name, String pattern) {
// we have wildcard support in that hence you can match with: file* to match any file endpoints
if (pattern.endsWith("*") && name.startsWith(pattern.substring(0, pattern.length() - 1))) {
return true;
}
return false;
}
/**
* Matches the name with the given pattern.
*
* The match rules are applied in this order:
*
* - regular expression match, returns true
* - otherwise returns false
*
*
* @param name the name
* @param pattern a pattern to match
* @return true if match, false otherwise.
*/
private static boolean matchRegex(String name, String pattern) {
// match by regular expression
try {
if (name.matches(pattern)) {
return true;
}
} catch (PatternSyntaxException e) {
// ignore
}
return false;
}
/**
* Sets the regular properties on the given bean
*
* @param context the camel context
* @param bean the bean
* @param parameters parameters
* @throws Exception is thrown if setting property fails
*/
public static void setProperties(CamelContext context, Object bean, Map parameters) throws Exception {
IntrospectionSupport.setProperties(context.getTypeConverter(), bean, parameters);
}
/**
* Sets the reference properties on the given bean
*
* This is convention over configuration, setting all reference parameters (using {@link #isReferenceParameter(String)}
* by looking it up in registry and setting it on the bean if possible.
*
* @param context the camel context
* @param bean the bean
* @param parameters parameters
* @throws Exception is thrown if setting property fails
*/
public static void setReferenceProperties(CamelContext context, Object bean, Map parameters) throws Exception {
Iterator> it = parameters.entrySet().iterator();
while (it.hasNext()) {
Map.Entry entry = it.next();
String name = entry.getKey();
Object v = entry.getValue();
String value = v != null ? v.toString() : null;
if (value != null && isReferenceParameter(value)) {
boolean hit = IntrospectionSupport.setProperty(context, context.getTypeConverter(), bean, name, null, value, true);
if (hit) {
// must remove as its a valid option and we could configure it
it.remove();
}
}
}
}
/**
* Is the given parameter a reference parameter (starting with a # char)
*
* @param parameter the parameter
* @return true if its a reference parameter
*/
public static boolean isReferenceParameter(String parameter) {
return parameter != null && parameter.trim().startsWith("#");
}
/**
* Resolves a reference parameter by making a lookup in the registry.
*
* @param type of object to lookup.
* @param context Camel context to use for lookup.
* @param value reference parameter value.
* @param type type of object to lookup.
* @return lookup result.
* @throws IllegalArgumentException if referenced object was not found in registry.
*/
public static T resolveReferenceParameter(CamelContext context, String value, Class type) {
return resolveReferenceParameter(context, value, type, true);
}
/**
* Resolves a reference parameter by making a lookup in the registry.
*
* @param type of object to lookup.
* @param context Camel context to use for lookup.
* @param value reference parameter value.
* @param type type of object to lookup.
* @return lookup result (or null only if
* mandatory is false).
* @throws IllegalArgumentException if object was not found in registry and
* mandatory is true.
*/
public static T resolveReferenceParameter(CamelContext context, String value, Class type, boolean mandatory) {
String valueNoHash = StringHelper.replaceAll(value, "#", "");
if (mandatory) {
return CamelContextHelper.mandatoryLookup(context, valueNoHash, type);
} else {
return CamelContextHelper.lookup(context, valueNoHash, type);
}
}
/**
* Resolves a reference list parameter by making lookups in the registry.
* The parameter value must be one of the following:
*
* - a comma-separated list of references to beans of type T
* - a single reference to a bean type T
* - a single reference to a bean of type java.util.List
*
*
* @param context Camel context to use for lookup.
* @param value reference parameter value.
* @param elementType result list element type.
* @return list of lookup results, will always return a list.
* @throws IllegalArgumentException if any referenced object was not found in registry.
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public static List resolveReferenceListParameter(CamelContext context, String value, Class elementType) {
if (value == null) {
return new ArrayList();
}
List elements = Arrays.asList(value.split(","));
if (elements.size() == 1) {
Object bean = resolveReferenceParameter(context, elements.get(0).trim(), Object.class);
if (bean instanceof List) {
// The bean is a list
return (List) bean;
} else {
// The bean is a list element
List singleElementList = new ArrayList();
singleElementList.add(elementType.cast(bean));
return singleElementList;
}
} else { // more than one list element
List result = new ArrayList(elements.size());
for (String element : elements) {
result.add(resolveReferenceParameter(context, element.trim(), elementType));
}
return result;
}
}
/**
* Resolves a parameter, by doing a reference lookup if the parameter is a reference, and converting
* the parameter to the given type.
*
* @param type of object to convert the parameter value as.
* @param context Camel context to use for lookup.
* @param value parameter or reference parameter value.
* @param type type of object to lookup.
* @return lookup result if it was a reference parameter, or the value converted to the given type
* @throws IllegalArgumentException if referenced object was not found in registry.
*/
public static T resolveParameter(CamelContext context, String value, Class type) {
T result;
if (EndpointHelper.isReferenceParameter(value)) {
result = EndpointHelper.resolveReferenceParameter(context, value, type);
} else {
result = context.getTypeConverter().convertTo(type, value);
}
return result;
}
/**
* @deprecated use {@link #resolveParameter(org.apache.camel.CamelContext, String, Class)}
*/
@Deprecated
public static T resloveStringParameter(CamelContext context, String value, Class type) {
return resolveParameter(context, value, type);
}
/**
* Gets the route id for the given endpoint in which there is a consumer listening.
*
* @param endpoint the endpoint
* @return the route id, or null if none found
*/
public static String getRouteIdFromEndpoint(Endpoint endpoint) {
if (endpoint == null || endpoint.getCamelContext() == null) {
return null;
}
List routes = endpoint.getCamelContext().getRoutes();
for (Route route : routes) {
if (route.getEndpoint().equals(endpoint)
|| route.getEndpoint().getEndpointKey().equals(endpoint.getEndpointKey())) {
return route.getId();
}
}
return null;
}
/**
* A helper method for Endpoint implementations to create new Ids for Endpoints which also implement
* {@link org.apache.camel.spi.HasId}
*/
public static String createEndpointId() {
return "endpoint" + ENDPOINT_COUNTER.incrementAndGet();
}
/**
* Lookup the id the given endpoint has been enlisted with in the {@link org.apache.camel.spi.Registry}.
*
* @param endpoint the endpoint
* @return the endpoint id, or null if not found
*/
public static String lookupEndpointRegistryId(Endpoint endpoint) {
if (endpoint == null || endpoint.getCamelContext() == null) {
return null;
}
// it may be a delegate endpoint, which we need to match as well
Endpoint delegate = null;
if (endpoint instanceof DelegateEndpoint) {
delegate = ((DelegateEndpoint) endpoint).getEndpoint();
}
Map map = endpoint.getCamelContext().getRegistry().findByTypeWithName(Endpoint.class);
for (Map.Entry entry : map.entrySet()) {
if (entry.getValue().equals(endpoint) || entry.getValue().equals(delegate)) {
return entry.getKey();
}
}
// not found
return null;
}
/**
* Browses the {@link BrowsableEndpoint} within the given range, and returns the messages as a XML payload.
*
* @param endpoint the browsable endpoint
* @param fromIndex from range
* @param toIndex to range
* @param includeBody whether to include the message body in the XML payload
* @return XML payload with the messages
* @throws IllegalArgumentException if the from and to range is invalid
* @see MessageHelper#dumpAsXml(org.apache.camel.Message)
*/
public static String browseRangeMessagesAsXml(BrowsableEndpoint endpoint, Integer fromIndex, Integer toIndex, Boolean includeBody) {
if (fromIndex == null) {
fromIndex = 0;
}
if (toIndex == null) {
toIndex = Integer.MAX_VALUE;
}
if (fromIndex > toIndex) {
throw new IllegalArgumentException("From index cannot be larger than to index, was: " + fromIndex + " > " + toIndex);
}
List exchanges = endpoint.getExchanges();
if (exchanges.size() == 0) {
return null;
}
StringBuilder sb = new StringBuilder();
sb.append("");
for (int i = fromIndex; i < exchanges.size() && i <= toIndex; i++) {
Exchange exchange = exchanges.get(i);
Message msg = exchange.hasOut() ? exchange.getOut() : exchange.getIn();
String xml = MessageHelper.dumpAsXml(msg, includeBody);
sb.append("\n").append(xml);
}
sb.append("\n ");
return sb.toString();
}
/**
* Attempts to resolve if the url has an exchangePattern option configured
*
* @param url the url
* @return the exchange pattern, or null if the url has no exchangePattern configured.
* @throws URISyntaxException is thrown if uri is invalid
*/
public static ExchangePattern resolveExchangePatternFromUrl(String url) throws URISyntaxException {
int idx = url.indexOf("?");
if (idx > 0) {
url = url.substring(idx + 1);
}
Map parameters = URISupport.parseQuery(url, true);
String pattern = (String) parameters.get("exchangePattern");
if (pattern != null) {
return ExchangePattern.asEnum(pattern);
}
return null;
}
/**
* Parses the endpoint uri and builds a map of documentation information for each option which is extracted
* from the component json documentation
*
* @param camelContext the Camel context
* @param uri the endpoint uri
* @return a map for each option in the uri with the corresponding information from the json
* @throws Exception is thrown in case of error
* @deprecated use {@link org.apache.camel.runtimecatalog.RuntimeCamelCatalog#endpointProperties(String)}
*/
@Deprecated
public static Map endpointProperties(CamelContext camelContext, String uri) throws Exception {
RuntimeCamelCatalog catalog = new DefaultRuntimeCamelCatalog(camelContext, false);
Map options = catalog.endpointProperties(uri);
return new HashMap<>(options);
}
}