org.apache.coyote.Response Maven / Gradle / Ivy
/*
* 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.coyote;
import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.Locale;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.servlet.WriteListener;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.buf.B2CConverter;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.http.MimeHeaders;
import org.apache.tomcat.util.http.parser.MediaType;
import org.apache.tomcat.util.res.StringManager;
/**
* Response object.
*
* @author James Duncan Davidson [[email protected]]
* @author Jason Hunter [[email protected]]
* @author James Todd [[email protected]]
* @author Harish Prabandham
* @author Hans Bergsten [[email protected]]
* @author Remy Maucherat
*/
public final class Response {
private static final StringManager sm = StringManager.getManager(Response.class);
private static final Log log = LogFactory.getLog(Response.class);
// ----------------------------------------------------- Class Variables
/**
* Default locale as mandated by the spec.
*/
private static final Locale DEFAULT_LOCALE = Locale.getDefault();
// ----------------------------------------------------- Instance Variables
/**
* Status code.
*/
int status = 200;
/**
* Status message.
*/
String message = null;
/**
* Response headers.
*/
final MimeHeaders headers = new MimeHeaders();
/**
* Associated output buffer.
*/
OutputBuffer outputBuffer;
/**
* Notes.
*/
final Object notes[] = new Object[Constants.MAX_NOTES];
/**
* Committed flag.
*/
volatile boolean commited = false;
/**
* Action hook.
*/
volatile ActionHook hook;
/**
* HTTP specific fields.
*/
String contentType = null;
String contentLanguage = null;
Charset charset = null;
// Retain the original name used to set the charset so exactly that name is
// used in the ContentType header. Some (arguably non-specification
// compliant) user agents are very particular
String characterEncoding = null;
long contentLength = -1;
private Locale locale = DEFAULT_LOCALE;
// General informations
private long contentWritten = 0;
private long commitTime = -1;
/**
* Holds request error exception.
*/
Exception errorException = null;
Request req;
// ------------------------------------------------------------- Properties
public Request getRequest() {
return req;
}
public void setRequest( Request req ) {
this.req=req;
}
public void setOutputBuffer(OutputBuffer outputBuffer) {
this.outputBuffer = outputBuffer;
}
public MimeHeaders getMimeHeaders() {
return headers;
}
protected void setHook(ActionHook hook) {
this.hook = hook;
}
// -------------------- Per-Response "notes" --------------------
public final void setNote(int pos, Object value) {
notes[pos] = value;
}
public final Object getNote(int pos) {
return notes[pos];
}
// -------------------- Actions --------------------
public void action(ActionCode actionCode, Object param) {
if (hook != null) {
if (param == null) {
hook.action(actionCode, this);
} else {
hook.action(actionCode, param);
}
}
}
// -------------------- State --------------------
public int getStatus() {
return status;
}
/**
* Set the response status.
*
* @param status The status value to set
*/
public void setStatus(int status) {
this.status = status;
}
/**
* Get the status message.
*
* @return The message associated with the current status
*/
public String getMessage() {
return message;
}
/**
* Set the status message.
*
* @param message The status message to set
*/
public void setMessage(String message) {
this.message = message;
}
public boolean isCommitted() {
return commited;
}
public void setCommitted(boolean v) {
if (v && !this.commited) {
this.commitTime = System.currentTimeMillis();
}
this.commited = v;
}
/**
* Return the time the response was committed (based on System.currentTimeMillis).
*
* @return the time the response was committed
*/
public long getCommitTime() {
return commitTime;
}
// -----------------Error State --------------------
/**
* Set the error Exception that occurred during request processing.
*
* @param ex The exception that occurred
*/
public void setErrorException(Exception ex) {
errorException = ex;
}
/**
* Get the Exception that occurred during request processing.
*
* @return The exception that occurred
*/
public Exception getErrorException() {
return errorException;
}
public boolean isExceptionPresent() {
return ( errorException != null );
}
// -------------------- Methods --------------------
public void reset() throws IllegalStateException {
if (commited) {
throw new IllegalStateException();
}
recycle();
}
// -------------------- Headers --------------------
/**
* Does the response contain the given header.
*
* Warning: This method always returns false for Content-Type
* and Content-Length.
*
* @param name The name of the header of interest
*
* @return {@code true} if the response contains the header.
*/
public boolean containsHeader(String name) {
return headers.getHeader(name) != null;
}
public void setHeader(String name, String value) {
char cc=name.charAt(0);
if( cc=='C' || cc=='c' ) {
if( checkSpecialHeader(name, value) )
return;
}
headers.setValue(name).setString( value);
}
public void addHeader(String name, String value) {
addHeader(name, value, null);
}
public void addHeader(String name, String value, Charset charset) {
char cc=name.charAt(0);
if( cc=='C' || cc=='c' ) {
if( checkSpecialHeader(name, value) )
return;
}
MessageBytes mb = headers.addValue(name);
if (charset != null) {
mb.setCharset(charset);
}
mb.setString(value);
}
/**
* Set internal fields for special header names.
* Called from set/addHeader.
* Return true if the header is special, no need to set the header.
*/
private boolean checkSpecialHeader( String name, String value) {
// XXX Eliminate redundant fields !!!
// ( both header and in special fields )
if( name.equalsIgnoreCase( "Content-Type" ) ) {
setContentType( value );
return true;
}
if( name.equalsIgnoreCase( "Content-Length" ) ) {
try {
long cL=Long.parseLong( value );
setContentLength( cL );
return true;
} catch( NumberFormatException ex ) {
// Do nothing - the spec doesn't have any "throws"
// and the user might know what he's doing
return false;
}
}
return false;
}
/** Signal that we're done with the headers, and body will follow.
* Any implementation needs to notify ContextManager, to allow
* interceptors to fix headers.
*/
public void sendHeaders() {
action(ActionCode.COMMIT, this);
setCommitted(true);
}
// -------------------- I18N --------------------
public Locale getLocale() {
return locale;
}
/**
* Called explicitly by user to set the Content-Language and the default
* encoding.
*
* @param locale The locale to use for this response
*/
public void setLocale(Locale locale) {
if (locale == null) {
return; // throw an exception?
}
// Save the locale for use by getLocale()
this.locale = locale;
// Set the contentLanguage for header output
contentLanguage = locale.toLanguageTag();
}
/**
* Return the content language.
*
* @return The language code for the language currently associated with this
* response
*/
public String getContentLanguage() {
return contentLanguage;
}
/**
* Overrides the name of the character encoding used in the body
* of the response. This method must be called prior to writing output
* using getWriter().
*
* @param characterEncoding String containing the name of the character
* encoding.
*/
public void setCharacterEncoding(String characterEncoding) {
if (isCommitted()) {
return;
}
if (characterEncoding == null) {
return;
}
try {
this.charset = B2CConverter.getCharset(characterEncoding);
} catch (UnsupportedEncodingException e) {
throw new IllegalArgumentException(e);
}
this.characterEncoding = characterEncoding;
}
/**
* @return The name of the current encoding
*/
public String getCharacterEncoding() {
return characterEncoding;
}
public Charset getCharset() {
return charset;
}
/**
* Sets the content type.
*
* This method must preserve any response charset that may already have
* been set via a call to response.setContentType(), response.setLocale(),
* or response.setCharacterEncoding().
*
* @param type the content type
*/
public void setContentType(String type) {
if (type == null) {
this.contentType = null;
return;
}
MediaType m = null;
try {
m = MediaType.parseMediaType(new StringReader(type));
} catch (IOException e) {
// Ignore - null test below handles this
}
if (m == null) {
// Invalid - Assume no charset and just pass through whatever
// the user provided.
this.contentType = type;
return;
}
this.contentType = m.toStringNoCharset();
String charsetValue = m.getCharset();
if (charsetValue != null) {
charsetValue = charsetValue.trim();
if (charsetValue.length() > 0) {
try {
charset = B2CConverter.getCharset(charsetValue);
} catch (UnsupportedEncodingException e) {
log.warn(sm.getString("response.encoding.invalid", charsetValue), e);
}
}
}
}
public void setContentTypeNoCharset(String type) {
this.contentType = type;
}
public String getContentType() {
String ret = contentType;
if (ret != null
&& charset != null) {
ret = ret + ";charset=" + characterEncoding;
}
return ret;
}
public void setContentLength(long contentLength) {
this.contentLength = contentLength;
}
public int getContentLength() {
long length = getContentLengthLong();
if (length < Integer.MAX_VALUE) {
return (int) length;
}
return -1;
}
public long getContentLengthLong() {
return contentLength;
}
/**
* Write a chunk of bytes.
*
* @param chunk The bytes to write
*
* @throws IOException If an I/O error occurs during the write
*
* @deprecated Unused. Will be removed in Tomcat 9. Use
* {@link #doWrite(ByteBuffer)}
*/
@Deprecated
public void doWrite(ByteChunk chunk) throws IOException {
outputBuffer.doWrite(chunk);
contentWritten+=chunk.getLength();
}
/**
* Write a chunk of bytes.
*
* @param chunk The ByteBuffer to write
*
* @throws IOException If an I/O error occurs during the write
*/
public void doWrite(ByteBuffer chunk) throws IOException {
int len = chunk.remaining();
outputBuffer.doWrite(chunk);
contentWritten += len - chunk.remaining();
}
// --------------------
public void recycle() {
contentType = null;
contentLanguage = null;
locale = DEFAULT_LOCALE;
charset = null;
characterEncoding = null;
contentLength = -1;
status = 200;
message = null;
commited = false;
commitTime = -1;
errorException = null;
headers.clear();
// Servlet 3.1 non-blocking write listener
listener = null;
fireListener = false;
registeredForWrite = false;
// update counters
contentWritten=0;
}
/**
* Bytes written by application - i.e. before compression, chunking, etc.
*
* @return The total number of bytes written to the response by the
* application. This will not be the number of bytes written to the
* network which may be more or less than this value.
*/
public long getContentWritten() {
return contentWritten;
}
/**
* Bytes written to socket - i.e. after compression, chunking, etc.
*
* @param flush Should any remaining bytes be flushed before returning the
* total? If {@code false} bytes remaining in the buffer will
* not be included in the returned value
*
* @return The total number of bytes written to the socket for this response
*/
public long getBytesWritten(boolean flush) {
if (flush) {
action(ActionCode.CLIENT_FLUSH, this);
}
return outputBuffer.getBytesWritten();
}
/*
* State for non-blocking output is maintained here as it is the one point
* easily reachable from the CoyoteOutputStream and the Processor which both
* need access to state.
*/
volatile WriteListener listener;
private boolean fireListener = false;
private boolean registeredForWrite = false;
private final Object nonBlockingStateLock = new Object();
public WriteListener getWriteListener() {
return listener;
}
public void setWriteListener(WriteListener listener) {
if (listener == null) {
throw new NullPointerException(
sm.getString("response.nullWriteListener"));
}
if (getWriteListener() != null) {
throw new IllegalStateException(
sm.getString("response.writeListenerSet"));
}
// Note: This class is not used for HTTP upgrade so only need to test
// for async
AtomicBoolean result = new AtomicBoolean(false);
action(ActionCode.ASYNC_IS_ASYNC, result);
if (!result.get()) {
throw new IllegalStateException(
sm.getString("response.notAsync"));
}
this.listener = listener;
// The container is responsible for the first call to
// listener.onWritePossible(). If isReady() returns true, the container
// needs to call listener.onWritePossible() from a new thread. If
// isReady() returns false, the socket will be registered for write and
// the container will call listener.onWritePossible() once data can be
// written.
if (isReady()) {
synchronized (nonBlockingStateLock) {
// Ensure we don't get multiple write registrations if
// ServletOutputStream.isReady() returns false during a call to
// onDataAvailable()
registeredForWrite = true;
// Need to set the fireListener flag otherwise when the
// container tries to trigger onWritePossible, nothing will
// happen
fireListener = true;
}
action(ActionCode.DISPATCH_WRITE, null);
if (!ContainerThreadMarker.isContainerThread()) {
// Not on a container thread so need to execute the dispatch
action(ActionCode.DISPATCH_EXECUTE, null);
}
}
}
public boolean isReady() {
if (listener == null) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("response.notNonBlocking"));
}
return false;
}
// Assume write is not possible
boolean ready = false;
synchronized (nonBlockingStateLock) {
if (registeredForWrite) {
fireListener = true;
return false;
}
ready = checkRegisterForWrite();
fireListener = !ready;
}
return ready;
}
public boolean checkRegisterForWrite() {
AtomicBoolean ready = new AtomicBoolean(false);
synchronized (nonBlockingStateLock) {
if (!registeredForWrite) {
action(ActionCode.NB_WRITE_INTEREST, ready);
registeredForWrite = !ready.get();
}
}
return ready.get();
}
public void onWritePossible() throws IOException {
// Any buffered data left over from a previous non-blocking write is
// written in the Processor so if this point is reached the app is able
// to write data.
boolean fire = false;
synchronized (nonBlockingStateLock) {
registeredForWrite = false;
if (fireListener) {
fireListener = false;
fire = true;
}
}
if (fire) {
listener.onWritePossible();
}
}
}
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