| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.livy.rsc; |
| |
| import java.io.IOException; |
| import java.net.URI; |
| import java.util.Properties; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import io.netty.util.concurrent.ImmediateEventExecutor; |
| import io.netty.util.concurrent.Promise; |
| |
| import org.apache.livy.LivyClient; |
| import org.apache.livy.LivyClientFactory; |
| import org.apache.livy.rsc.rpc.RpcServer; |
| |
| /** |
| * Factory for RSC clients. |
| */ |
| public final class RSCClientFactory implements LivyClientFactory { |
| |
| private final AtomicInteger refCount = new AtomicInteger(); |
| private RpcServer server = null; |
| // interactive session child processes number |
| private static AtomicInteger iscpn = new AtomicInteger(); |
| |
| public static AtomicInteger childProcesses() { |
| return iscpn; |
| } |
| |
| /** |
| * Creates a local Livy client if the URI has the "rsc" scheme. |
| * <p> |
| * If the URI contains user information, host and port, the library will try to connect to an |
| * existing RSC instance with the provided information, and most of the provided configuration |
| * will be ignored. |
| * <p> |
| * Otherwise, a new Spark context will be started with the given configuration. |
| */ |
| @Override |
| public LivyClient createClient(URI uri, Properties config) { |
| if (!"rsc".equals(uri.getScheme())) { |
| return null; |
| } |
| |
| RSCConf lconf = new RSCConf(config); |
| |
| boolean needsServer = false; |
| try { |
| Promise<ContextInfo> info; |
| Process driverProcess = null; |
| if (uri.getUserInfo() != null && uri.getHost() != null && uri.getPort() > 0) { |
| info = createContextInfo(uri); |
| } else { |
| needsServer = true; |
| ref(lconf); |
| DriverProcessInfo processInfo = ContextLauncher.create(this, lconf); |
| info = processInfo.getContextInfo(); |
| driverProcess = processInfo.getDriverProcess(); |
| } |
| return new RSCClient(lconf, info, driverProcess); |
| } catch (Exception e) { |
| if (needsServer) { |
| unref(); |
| } |
| throw Utils.propagate(e); |
| } |
| } |
| |
| RpcServer getServer() { |
| return server; |
| } |
| |
| private synchronized void ref(RSCConf config) throws IOException { |
| if (refCount.get() != 0) { |
| refCount.incrementAndGet(); |
| return; |
| } |
| |
| Utils.checkState(server == null, "Server already running but ref count is 0."); |
| if (server == null) { |
| try { |
| server = new RpcServer(config); |
| } catch (InterruptedException ie) { |
| throw Utils.propagate(ie); |
| } |
| } |
| |
| refCount.incrementAndGet(); |
| } |
| |
| synchronized void unref() { |
| if (refCount.decrementAndGet() == 0) { |
| server.close(); |
| server = null; |
| } |
| } |
| |
| private static Promise<ContextInfo> createContextInfo(final URI uri) { |
| String[] userInfo = uri.getUserInfo().split(":", 2); |
| ImmediateEventExecutor executor = ImmediateEventExecutor.INSTANCE; |
| Promise<ContextInfo> promise = executor.newPromise(); |
| promise.setSuccess(new ContextInfo(uri.getHost(), uri.getPort(), userInfo[0], userInfo[1])); |
| return promise; |
| } |
| |
| } |