org.apache.camel.component.properties.ServiceHostPropertiesFunction Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of camel-core Show documentation
Show all versions of camel-core Show documentation
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.component.properties;
import java.util.Locale;
import org.apache.camel.util.StringHelper;
/**
* A {@link PropertiesFunction} that lookup the property value from
* OS environment variables using the service idiom.
*
* A service is defined using two environment variables where name is name of the service:
*
* - NAME_SERVICE_HOST
* - NAME_SERVICE_PORT
*
* in other words the service uses _SERVICE_HOST and _SERVICE_PORT as prefix.
*
* This implementation is to return the host part only.
*
* @see ServicePropertiesFunction
* @see ServicePortPropertiesFunction
*/
public class ServiceHostPropertiesFunction implements PropertiesFunction {
private static final String HOST_PREFIX = "_SERVICE_HOST";
@Override
public String getName() {
return "service.host";
}
@Override
public String apply(String remainder) {
String key = remainder;
String defaultValue = null;
if (remainder.contains(":")) {
key = StringHelper.before(remainder, ":");
defaultValue = StringHelper.after(remainder, ":");
}
// make sure to use upper case
if (key != null) {
// make sure to use underscore as dash is not supported as ENV variables
key = key.toUpperCase(Locale.ENGLISH).replace('-', '_');
// a service should have both the host and port defined
String host = System.getenv(key + HOST_PREFIX);
if (host != null) {
return host;
} else {
return defaultValue;
}
}
return defaultValue;
}
}