Amend previous commit of HADOOP-8350 (missed new SocketInputWrapper file)
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1333650 13f79535-47bb-0310-9956-ffa450edef68
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/**
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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.net;
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import java.io.FilterInputStream;
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import java.io.InputStream;
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import java.net.Socket;
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import java.net.SocketException;
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import java.nio.channels.ReadableByteChannel;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.classification.InterfaceStability;
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import com.google.common.base.Preconditions;
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/**
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* A wrapper stream around a socket which allows setting of its timeout. If the
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* socket has a channel, this uses non-blocking IO via the package-private
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* {@link SocketInputStream} implementation. Otherwise, timeouts are managed by
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* setting the underlying socket timeout itself.
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*/
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@InterfaceAudience.LimitedPrivate("HDFS")
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@InterfaceStability.Unstable
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public class SocketInputWrapper extends FilterInputStream {
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private final Socket socket;
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private final boolean hasChannel;
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SocketInputWrapper(Socket s, InputStream is) {
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super(is);
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this.socket = s;
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this.hasChannel = s.getChannel() != null;
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if (hasChannel) {
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Preconditions.checkArgument(is instanceof SocketInputStream,
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"Expected a SocketInputStream when there is a channel. " +
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"Got: %s", is);
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}
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}
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/**
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* Set the timeout for reads from this stream.
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*
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* Note: the behavior here can differ subtly depending on whether the
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* underlying socket has an associated Channel. In particular, if there is no
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* channel, then this call will affect the socket timeout for <em>all</em>
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* readers of this socket. If there is a channel, then this call will affect
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* the timeout only for <em>this</em> stream. As such, it is recommended to
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* only create one {@link SocketInputWrapper} instance per socket.
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*
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* @param timeoutMs
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* the new timeout, 0 for no timeout
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* @throws SocketException
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* if the timeout cannot be set
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*/
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public void setTimeout(long timeoutMs) throws SocketException {
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if (hasChannel) {
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((SocketInputStream)in).setTimeout(timeoutMs);
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} else {
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socket.setSoTimeout((int)timeoutMs);
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}
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}
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/**
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* @return an underlying ReadableByteChannel implementation.
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* @throws IllegalStateException if this socket does not have a channel
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*/
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public ReadableByteChannel getReadableByteChannel() {
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Preconditions.checkState(hasChannel,
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"Socket %s does not have a channel",
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this.socket);
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return (SocketInputStream)in;
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}
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}
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