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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2012-2013 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
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*
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*/
package org.glassfish.jersey.servlet.internal;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.core.MultivaluedMap;
import javax.servlet.http.HttpServletResponse;
import org.glassfish.jersey.server.ContainerException;
import org.glassfish.jersey.server.ContainerResponse;
import org.glassfish.jersey.server.spi.ContainerResponseWriter;
import org.glassfish.jersey.servlet.spi.AsyncContextDelegate;
import com.google.common.util.concurrent.SettableFuture;
/**
* An internal implementation of {@link ContainerResponseWriter} for Servlet containers.
* The writer depends on provided {@link AsyncContextDelegate} to support async functionality.
*
* @author Paul Sandoz (paul.sandoz at oracle.com)
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
* @author Martin Matula (martin.matula at oracle.com)
*/
public class ResponseWriter implements ContainerResponseWriter {
private static final Logger LOGGER = Logger.getLogger(ResponseWriter.class.getName());
private final HttpServletResponse response;
private final boolean useSetStatusOn404;
private final SettableFuture responseContext;
private final AsyncContextDelegate asyncExt;
/**
* Creates a new instance to write a single Jersey response.
*
* @param useSetStatusOn404 true if status should be written explicitly when 404 is returned
* @param response original HttpResponseRequest
* @param asyncExt delegate to use for async features implementation
*/
public ResponseWriter(final boolean useSetStatusOn404, final HttpServletResponse response, AsyncContextDelegate asyncExt) {
this.useSetStatusOn404 = useSetStatusOn404;
this.response = response;
this.asyncExt = asyncExt;
this.responseContext = SettableFuture.create();
}
@Override
public boolean suspend(final long timeOut, final TimeUnit timeUnit, final TimeoutHandler timeoutHandler) {
try {
asyncExt.suspend(this, timeOut, timeUnit, timeoutHandler);
return true;
} catch (IllegalStateException ex) {
return false;
}
}
@Override
public void setSuspendTimeout(long timeOut, TimeUnit timeUnit) throws IllegalStateException {
asyncExt.setSuspendTimeout(timeOut, timeUnit);
}
@Override
public OutputStream writeResponseStatusAndHeaders(long contentLength, ContainerResponse responseContext)
throws ContainerException {
this.responseContext.set(responseContext);
// first set the content length, so that if headers have an explicit value, it takes precedence over this one
if (responseContext.hasEntity() && contentLength != -1 && contentLength < Integer.MAX_VALUE) {
response.setContentLength((int) contentLength);
}
// Note that the writing of headers MUST be performed before
// the invocation of sendError as on some Servlet implementations
// modification of the response headers will have no effect
// after the invocation of sendError.
MultivaluedMap headers = getResponseContext().getStringHeaders();
for (Map.Entry> e : headers.entrySet()) {
for (String v : e.getValue()) {
final String header = e.getKey();
if (!response.containsHeader(header)) {
response.addHeader(header, v);
}
}
}
response.setStatus(responseContext.getStatus());
if (!responseContext.hasEntity()) {
return null;
} else {
try {
return response.getOutputStream();
} catch (IOException e) {
throw new ContainerException(e);
}
}
}
@Override
public void commit() {
try {
if (!response.isCommitted()) {
final ContainerResponse responseContext = getResponseContext();
final int status = responseContext.getStatus();
if (status >= 400 && !(useSetStatusOn404 && status == 404)) {
final String reason = responseContext.getStatusInfo().getReasonPhrase();
try {
if (reason == null || reason.isEmpty()) {
response.sendError(status);
} else {
response.sendError(status, reason);
}
} catch (IOException ex) {
throw new ContainerException("I/O exception occurred while sending [" + status + "] error response.", ex);
}
}
}
} finally {
asyncExt.complete();
}
}
@Override
public void failure(Throwable error) {
try {
if (!response.isCommitted()) {
try {
response.reset();
response.sendError(500, "Request failed.");
} catch (IllegalStateException ex) {
// a race condition externally committing the response can still occur...
LOGGER.log(Level.FINER, "Unable to reset failed response.", ex);
} catch (IOException ex) {
throw new ContainerException("I/O exception occurred while sending 'Request failed.' error response.", ex);
} finally {
asyncExt.complete();
}
}
} finally {
rethrow(error);
}
}
@Override
public boolean enableResponseBuffering() {
return true;
}
/**
* Rethrow the original exception as required by JAX-RS, 3.3.4
*
* @param error throwable to be re-thrown
*/
private void rethrow(Throwable error) {
if (error instanceof RuntimeException) {
throw (RuntimeException) error;
} else {
throw new ContainerException(error);
}
}
/**
* Provides response status captured when {@link #writeResponseStatusAndHeaders(long, org.glassfish.jersey.server.ContainerResponse)} has been invoked.
* The method will block if the write method has not been called yet.
*
* @return response status
*/
public int getResponseStatus() {
return getResponseContext().getStatus();
}
private ContainerResponse getResponseContext() {
try {
return responseContext.get();
} catch (InterruptedException ex) {
throw new ContainerException(ex);
} catch (ExecutionException ex) {
throw new ContainerException(ex);
}
}
}
