100 lines
3.5 KiB
Java
100 lines
3.5 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.fs.swift.http;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import java.io.IOException;
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import java.lang.reflect.Constructor;
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import java.net.ConnectException;
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import java.net.NoRouteToHostException;
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import java.net.SocketTimeoutException;
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import java.net.UnknownHostException;
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/**
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* Variant of Hadoop Netutils exception wrapping with URI awareness and
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* available in branch-1 too.
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*/
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public class ExceptionDiags {
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private static final Log LOG = LogFactory.getLog(ExceptionDiags.class);
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/** text to point users elsewhere: {@value} */
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private static final String FOR_MORE_DETAILS_SEE
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= " For more details see: ";
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/** text included in wrapped exceptions if the host is null: {@value} */
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public static final String UNKNOWN_HOST = "(unknown)";
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/** Base URL of the Hadoop Wiki: {@value} */
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public static final String HADOOP_WIKI = "http://wiki.apache.org/hadoop/";
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/**
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* Take an IOException and a URI, wrap it where possible with
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* something that includes the URI
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*
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* @param dest target URI
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* @param operation operation
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* @param exception the caught exception.
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* @return an exception to throw
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*/
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public static IOException wrapException(final String dest,
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final String operation,
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final IOException exception) {
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String action = operation + " " + dest;
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String xref = null;
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if (exception instanceof ConnectException) {
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xref = "ConnectionRefused";
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} else if (exception instanceof UnknownHostException) {
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xref = "UnknownHost";
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} else if (exception instanceof SocketTimeoutException) {
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xref = "SocketTimeout";
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} else if (exception instanceof NoRouteToHostException) {
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xref = "NoRouteToHost";
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}
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String msg = action
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+ " failed on exception: "
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+ exception;
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if (xref != null) {
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msg = msg + ";" + see(xref);
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}
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return wrapWithMessage(exception, msg);
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}
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private static String see(final String entry) {
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return FOR_MORE_DETAILS_SEE + HADOOP_WIKI + entry;
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}
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@SuppressWarnings("unchecked")
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private static <T extends IOException> T wrapWithMessage(
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T exception, String msg) {
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Class<? extends Throwable> clazz = exception.getClass();
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try {
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Constructor<? extends Throwable> ctor =
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clazz.getConstructor(String.class);
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Throwable t = ctor.newInstance(msg);
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return (T) (t.initCause(exception));
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} catch (Throwable e) {
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LOG.warn("Unable to wrap exception of type " +
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clazz + ": it has no (String) constructor", e);
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return exception;
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}
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}
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}
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