| /* |
| * 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.PrintWriter; |
| import java.io.StringWriter; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import io.netty.util.concurrent.Future; |
| import io.netty.util.concurrent.GenericFutureListener; |
| |
| /** |
| * A few simple utility functions used by the code, mostly to avoid a direct dependency |
| * on Guava. |
| */ |
| public class Utils { |
| |
| public static void checkArgument(boolean condition) { |
| if (!condition) { |
| throw new IllegalArgumentException(); |
| } |
| } |
| |
| public static void checkArgument(boolean condition, String msg, Object... args) { |
| if (!condition) { |
| throw new IllegalArgumentException(String.format(msg, args)); |
| } |
| } |
| |
| public static void checkState(boolean condition, String msg, Object... args) { |
| if (!condition) { |
| throw new IllegalStateException(String.format(msg, args)); |
| } |
| } |
| |
| public static void checkNotNull(Object o) { |
| if (o == null) { |
| throw new NullPointerException(); |
| } |
| } |
| |
| public static RuntimeException propagate(Throwable t) { |
| if (t instanceof RuntimeException) { |
| throw (RuntimeException) t; |
| } else { |
| throw new RuntimeException(t); |
| } |
| } |
| |
| public static ThreadFactory newDaemonThreadFactory(final String nameFormat) { |
| return new ThreadFactory() { |
| |
| private final AtomicInteger threadId = new AtomicInteger(); |
| |
| @Override |
| public Thread newThread(Runnable r) { |
| Thread t = new Thread(r); |
| t.setName(String.format(nameFormat, threadId.incrementAndGet())); |
| t.setDaemon(true); |
| return t; |
| } |
| |
| }; |
| } |
| |
| public static String join(Iterable<String> strs, String sep) { |
| StringBuilder sb = new StringBuilder(); |
| for (String s : strs) { |
| if (s != null && !s.isEmpty()) { |
| sb.append(s).append(sep); |
| } |
| } |
| if (sb.length() > 0) { |
| sb.setLength(sb.length() - sep.length()); |
| } |
| return sb.toString(); |
| } |
| |
| public static String stackTraceAsString(Throwable t) { |
| StringWriter stringWriter = new StringWriter(); |
| t.printStackTrace(new PrintWriter(stringWriter)); |
| return stringWriter.toString(); |
| } |
| |
| public static <T> void addListener(Future<T> future, final FutureListener<T> lsnr) { |
| future.addListener(new GenericFutureListener<Future<T>>() { |
| @Override |
| public void operationComplete(Future<T> f) throws Exception { |
| if (f.isSuccess()) { |
| lsnr.onSuccess(f.get()); |
| } else { |
| lsnr.onFailure(f.cause()); |
| } |
| } |
| }); |
| } |
| |
| private Utils() { } |
| |
| } |