/*
* 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.yarn.boot.condition;
import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.util.StringUtils;
/**
* {@link Condition} that checks for the presence of Hadoop Yarn appmaster.
*
* @author Janne Valkealahti
*
*/
class OnYarnAppmasterCondition extends SpringBootCondition {
private final static String TOKEN_ENV = "HADOOP_TOKEN_FILE_LOCATION";
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
String tokenEnv = System.getenv(TOKEN_ENV);
// TODO: check that this is ok
if (!StringUtils.hasText(tokenEnv)) {
tokenEnv = System.getProperty(TOKEN_ENV);
}
if (tokenEnv != null) {
String[] split = tokenEnv.split("/");
if (split.length > 2 && split[split.length-2].endsWith("00001")) {
return ConditionOutcome.match("Detected container id " + split[split.length-2] + " ending with '00001'");
}
}
return ConditionOutcome.noMatch("System environment variable " + TOKEN_ENV + " not found");
}
}