org.springframework.cloud.aws.context.annotation.OnAwsCloudEnvironmentCondition.java Source code

Introduction

Here is the source code for org.springframework.cloud.aws.context.annotation.OnAwsCloudEnvironmentCondition.java

Source

/*
 * 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.annotation;

import com.amazonaws.AmazonClientException;
import com.amazonaws.util.EC2MetadataUtils;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.ConfigurationCondition;
import org.springframework.core.type.AnnotatedTypeMetadata;

/**
 * @author Agim Emruli
 * @author Gleb Schukin
 */
public class OnAwsCloudEnvironmentCondition implements ConfigurationCondition {

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

    private static Boolean isCloudEnvironment;

    @Override
    public ConfigurationPhase getConfigurationPhase() {
        return ConfigurationPhase.PARSE_CONFIGURATION;
    }

    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        if (isCloudEnvironment == null) {
            try {
                isCloudEnvironment = EC2MetadataUtils.getData(EC2_METADATA_ROOT + "/instance-id", 1) != null;
            } catch (AmazonClientException e) {
                isCloudEnvironment = false;
            }
        }

        return isCloudEnvironment;
    }
}