/*
 * Copyright 2012-2015 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.boot.autoconfigure.cloud;

import org.springframework.boot.autoconfigure.AutoConfigureOrder;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.cloud.Cloud;
import org.springframework.cloud.app.ApplicationInstanceInfo;
import org.springframework.cloud.config.java.CloudScan;
import org.springframework.cloud.config.java.CloudScanConfiguration;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.Profile;
import org.springframework.core.Ordered;

/**
 * {@link EnableAutoConfiguration Auto-configuration} for Spring Cloud.
 * <p>
 * Activates when there is no bean of type {@link Cloud} is configured in the context, the
 * {@link Cloud} type (this spring-cloud) is on the classpath, and the "cloud" profile is
 * active.
 * <p>
 * Once in effect, the auto-configuration is the equivalent of adding the
 * {@link CloudScan} annotation in one of the configuration file. Specifically, it adds a
 * bean for each service bound to the application and one for
 * {@link ApplicationInstanceInfo}
 *
 * @author Ramnivas Laddad
 * @since 1.2.0
 */
@Configuration
@Profile("cloud")
@AutoConfigureOrder(CloudAutoConfiguration.ORDER)
@ConditionalOnClass(CloudScanConfiguration.class)
@ConditionalOnMissingBean(Cloud.class)
@ConditionalOnProperty(prefix = "spring.cloud", name = "enabled", havingValue = "true", matchIfMissing = true)
@Import(CloudScanConfiguration.class)
public class CloudAutoConfiguration {

	// Cloud configuration needs to happen early (before data, mongo etc.)
	public static final int ORDER = Ordered.HIGHEST_PRECEDENCE + 20;

}
