org.springframework.cloud.aws.context.support.env.AwsCloudEnvironmentCheckUtils.java Source code

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Here is the source code for org.springframework.cloud.aws.context.support.env.AwsCloudEnvironmentCheckUtils.java

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/*
 * Copyright 2013-2014 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.aws.context.support.env;

import com.amazonaws.AmazonClientException;
import com.amazonaws.util.EC2MetadataUtils;

/**
 * @author Lukasz Luszczynski
 */
public final class AwsCloudEnvironmentCheckUtils {

    private static final String EC2_METADATA_ROOT = "/latest/meta-data";

    private AwsCloudEnvironmentCheckUtils() {
    }

    private static Boolean isCloudEnvironment;

    public static boolean isRunningOnCloudEnvironment() {
        if (isCloudEnvironment == null) {
            try {
                isCloudEnvironment = EC2MetadataUtils.getData(EC2_METADATA_ROOT + "/instance-id", 1) != null;
            } catch (AmazonClientException e) {
                isCloudEnvironment = false;
            }
        }
        return isCloudEnvironment;
    }
}