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/*******************************************************************************
* Copyright (c) 2004, 2010 Composent, Inc., IBM All rights reserved. This
* program and the accompanying materials are made available under the terms of
* the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Composent, Inc. - initial API and implementation
* Maarten Meijer - bug 237936, added gzip encoded transfer default
* Henrich Kraemer - bug 263869, testHttpsReceiveFile fails using HTTP proxy
* Henrich Kraemer - bug 263613, [transport] Update site contacting / downloading is not cancelable
* Tasktop Technologies - cancellation support for streams
******************************************************************************/
package org.eclipse.mylyn.internal.commons.net.http;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
import org.apache.commons.httpclient.HttpConnection;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpState;
import org.apache.commons.httpclient.methods.GetMethod;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.mylyn.commons.net.WebUtil;
import org.eclipse.mylyn.commons.net.http.CommonHttpMethod3;
/**
* Based on {@code org.eclipse.ecf.provider.filetransfer.httpclient.HttpClientRetrieveFileTransfer}.
*
* @author Steffen Pingel
*/
public class CommonGetMethod3 extends GetMethod implements CommonHttpMethod3 {
private boolean gzipAccepted;
private boolean gzipReceived;
private InputStream inputStream;
private final Object releaseLock = new Object();
public CommonGetMethod3() {
init();
}
public CommonGetMethod3(String requestPath) {
super(requestPath);
init();
}
@Override
public int execute(HttpState state, HttpConnection conn) throws HttpException, IOException {
if (gzipAccepted) {
this.setRequestHeader("Accept-encoding", CONTENT_ENCODING_GZIP); //$NON-NLS-1$
}
return super.execute(state, conn);
}
public InputStream getResponseBodyAsStream(IProgressMonitor monitor) throws IOException {
if (inputStream == null) {
inputStream = WebUtil.getResponseBodyAsStream(this, monitor);
}
gzipReceived = isZippedResponse();
if (gzipReceived) {
inputStream = new GZIPInputStream(inputStream);
}
return inputStream;
}
private void init() {
gzipAccepted = true;
}
public final boolean isGzipAccepted() {
return gzipAccepted;
}
private boolean isZippedResponse() {
// see bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=269018
return this.getResponseHeader(CONTENT_ENCODING) != null
&& this.getResponseHeader(CONTENT_ENCODING).getValue().equals(CONTENT_ENCODING_GZIP);
}
// This override is a workaround for
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=279457
// This makes GetMethod.releaseConnection non-reentrant,
// as with reentrancy under some circumstances a NPE can be
// thrown with multithreaded access
@Override
public void releaseConnection() {
synchronized (releaseLock) {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
// ignore
}
inputStream = null;
}
super.releaseConnection();
}
}
public void releaseConnection(IProgressMonitor monitor) {
if (monitor != null && monitor.isCanceled()) {
// force a connection close on cancel to avoid blocking to do reading the remainder of the response
abort();
}
try {
releaseConnection();
} catch (NullPointerException e) {
// ignore, see bug 255417
}
}
@Override
protected void responseBodyConsumed() {
// ensure worker is released to pool
super.responseBodyConsumed();
}
public final void setGzipAccepted(boolean gzipAccepted) {
this.gzipAccepted = gzipAccepted;
}
}
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