io.druid.indexing.overlord.autoscaling.ec2.EC2UserData Maven / Gradle / Ivy

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * 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 io.druid.indexing.overlord.autoscaling.ec2;

import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;

/**
 * Represents any user data that may be needed to launch EC2 instances.
 */
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "impl", defaultImpl = GalaxyEC2UserData.class)
@JsonSubTypes(value = {
    @JsonSubTypes.Type(name = "galaxy", value = GalaxyEC2UserData.class),
    @JsonSubTypes.Type(name = "string", value = StringEC2UserData.class)
})
public interface EC2UserData
{
  /**
   * Return a copy of this instance with a different worker version. If no changes are needed (possibly because the
   * user data does not depend on the worker version) then it is OK to return "this".
   *
   * @param version worker version
   * @return instance with the specified version
   */
  public EC2UserData withVersion(String version);

  public String getUserDataBase64();
}