package com.thinkbiganalytics.spark.shell;
/*-
* #%L
* Spark Shell Service API
* %%
* Copyright (C) 2017 ThinkBig Analytics
* %%
* 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.
* #L%
*/
import com.thinkbiganalytics.spark.rest.model.RegistrationRequest;
import javax.annotation.Nonnull;
/**
* Handles starting and stopping instances of the Spark Shell process.
*/
public interface SparkShellProcessManager {
/**
* Waits for a Spark Shell process to start for the specified user.
*
* @param username the user who will be using the Spark Shell process
* @return the Spark Shell process
* @throws IllegalStateException if a Spark Shell process cannot be started
* @throws InterruptedException if the current thread is interrupted while it is waiting
*/
@Nonnull
SparkShellProcess getProcessForUser(@Nonnull String username) throws InterruptedException;
/**
* Waits for the system Spark Shell process to start.
*
* @return the system Spark Shell process
* @throws IllegalStateException if a Spark Shell process cannot be started
* @throws InterruptedException if the current thread is interrupted while it is waiting
*/
@Nonnull
SparkShellProcess getSystemProcess() throws InterruptedException;
/**
* Registers the specified Spark Shell process for handling user requests.
*
* <p>This method is not required to be implemented for every process manager. When a Spark Shell process is run on a remote machine then a process manager may require it to register once it
* has finished starting.</p>
*
* @param clientId the Spark Shell client id
* @param clientSecret the Spark Shell client secret
* @param registration the Spark Shell registration request
* @throws IllegalArgumentException if the client id or secret is not recognized
* @throws UnsupportedOperationException if this process manager does not support registration
*/
void register(@Nonnull String clientId, @Nonnull String clientSecret, @Nonnull RegistrationRequest registration);
/**
* Starts a new Spark Shell process for the specified user if one is not already running.
*
* <p>This method will return immediately but it may take a minute or two for the Spark Shell process to startup.</p>
*
* @param username the user who will be using the Spark Shell process
* @throws IllegalStateException if a Spark Shell process cannot be started
*/
void start(@Nonnull String username) throws IllegalStateException;
}