org.apache.coyote.http11.upgrade.UpgradeServletInputStream 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.http11.upgrade;
import java.io.IOException;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import org.apache.coyote.ContainerThreadMarker;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.net.DispatchType;
import org.apache.tomcat.util.net.SocketWrapperBase;
import org.apache.tomcat.util.res.StringManager;
public class UpgradeServletInputStream extends ServletInputStream {
private static final Log log = LogFactory.getLog(UpgradeServletInputStream.class);
private static final StringManager sm =
StringManager.getManager(UpgradeServletInputStream.class);
private final UpgradeProcessorBase processor;
private final SocketWrapperBase socketWrapper;
private volatile boolean closed = false;
private volatile boolean eof = false;
// Start in blocking-mode
private volatile Boolean ready = Boolean.TRUE;
private volatile ReadListener listener = null;
public UpgradeServletInputStream(UpgradeProcessorBase processor,
SocketWrapperBase socketWrapper) {
this.processor = processor;
this.socketWrapper = socketWrapper;
}
@Override
public final boolean isFinished() {
if (listener == null) {
throw new IllegalStateException(
sm.getString("upgrade.sis.isFinished.ise"));
}
return eof;
}
@Override
public final boolean isReady() {
if (listener == null) {
throw new IllegalStateException(
sm.getString("upgrade.sis.isReady.ise"));
}
if (eof || closed) {
return false;
}
// If we already know the current state, return it.
if (ready != null) {
return ready.booleanValue();
}
try {
ready = Boolean.valueOf(socketWrapper.isReadyForRead());
} catch (IOException e) {
onError(e);
}
return ready.booleanValue();
}
@Override
public final void setReadListener(ReadListener listener) {
if (listener == null) {
throw new IllegalArgumentException(
sm.getString("upgrade.sis.readListener.null"));
}
if (this.listener != null) {
throw new IllegalArgumentException(
sm.getString("upgrade.sis.readListener.set"));
}
if (closed) {
throw new IllegalStateException(sm.getString("upgrade.sis.read.closed"));
}
this.listener = listener;
// Container is responsible for first call to onDataAvailable().
if (ContainerThreadMarker.isContainerThread()) {
processor.addDispatch(DispatchType.NON_BLOCKING_READ);
} else {
socketWrapper.registerReadInterest();
}
// Switching to non-blocking. Don't know if data is available.
ready = null;
}
@Override
public final int read() throws IOException {
preReadChecks();
return readInternal();
}
@Override
public final int readLine(byte[] b, int off, int len) throws IOException {
preReadChecks();
if (len <= 0) {
return 0;
}
int count = 0, c;
while ((c = readInternal()) != -1) {
b[off++] = (byte) c;
count++;
if (c == '\n' || count == len) {
break;
}
}
return count > 0 ? count : -1;
}
@Override
public final int read(byte[] b, int off, int len) throws IOException {
preReadChecks();
try {
int result = socketWrapper.read(listener == null, b, off, len);
if (result == -1) {
eof = true;
}
return result;
} catch (IOException ioe) {
close();
throw ioe;
}
}
@Override
public void close() throws IOException {
eof = true;
closed = true;
}
private void preReadChecks() {
if (listener != null && (ready == null || !ready.booleanValue())) {
throw new IllegalStateException(sm.getString("upgrade.sis.read.ise"));
}
if (closed) {
throw new IllegalStateException(sm.getString("upgrade.sis.read.closed"));
}
// No longer know if data is available
ready = null;
}
private int readInternal() throws IOException {
// Single byte reads for non-blocking need special handling so all
// single byte reads run through this method.
byte[] b = new byte[1];
int result;
try {
result = socketWrapper.read(listener == null, b, 0, 1);
} catch (IOException ioe) {
close();
throw ioe;
}
if (result == 0) {
return -1;
} else if (result == -1) {
eof = true;
return -1;
} else {
return b[0] & 0xFF;
}
}
final void onDataAvailable() {
try {
if (listener == null || !socketWrapper.isReadyForRead()) {
return;
}
} catch (IOException e) {
onError(e);
}
ready = Boolean.TRUE;
ClassLoader oldCL = processor.getUpgradeToken().getContextBind().bind(false, null);
try {
if (!eof) {
listener.onDataAvailable();
}
if (eof) {
listener.onAllDataRead();
}
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
onError(t);
} finally {
processor.getUpgradeToken().getContextBind().unbind(false, oldCL);
}
}
private final void onError(Throwable t) {
if (listener == null) {
return;
}
ClassLoader oldCL = processor.getUpgradeToken().getContextBind().bind(false, null);
try {
listener.onError(t);
} catch (Throwable t2) {
ExceptionUtils.handleThrowable(t2);
log.warn(sm.getString("upgrade.sis.onErrorFail"), t2);
} finally {
processor.getUpgradeToken().getContextBind().unbind(false, oldCL);
}
try {
close();
} catch (IOException ioe) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("upgrade.sis.errorCloseFail"), ioe);
}
}
ready = Boolean.FALSE;
}
final boolean isClosed() {
return closed;
}
}