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/*
* 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.net.InetAddress;
import java.nio.ByteBuffer;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanRegistration;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import jakarta.servlet.http.HttpUpgradeHandler;
import jakarta.servlet.http.WebConnection;
import org.apache.coyote.http11.upgrade.InternalHttpUpgradeHandler;
import org.apache.juli.logging.Log;
import org.apache.tomcat.InstanceManager;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.collections.SynchronizedStack;
import org.apache.tomcat.util.modeler.Registry;
import org.apache.tomcat.util.net.AbstractEndpoint;
import org.apache.tomcat.util.net.AbstractEndpoint.Handler;
import org.apache.tomcat.util.net.SocketEvent;
import org.apache.tomcat.util.net.SocketWrapperBase;
import org.apache.tomcat.util.res.StringManager;
public abstract class AbstractProtocol implements ProtocolHandler, MBeanRegistration {
/**
* The string manager for this package.
*/
private static final StringManager sm = StringManager.getManager(AbstractProtocol.class);
/**
* Counter used to generate unique JMX names for connectors using automatic port binding.
*/
private static final AtomicInteger nameCounter = new AtomicInteger(0);
/**
* Unique ID for this connector. Only used if the connector is configured to use a random port as the port will
* change if stop(), start() is called.
*/
private int nameIndex = 0;
/**
* Endpoint that provides low-level network I/O - must be matched to the ProtocolHandler implementation
* (ProtocolHandler using NIO, requires NIO Endpoint etc.).
*/
private final AbstractEndpoint endpoint;
private Handler handler;
private final Set waitingProcessors = ConcurrentHashMap.newKeySet();
/**
* Controller for the timeout scheduling.
*/
private ScheduledFuture timeoutFuture = null;
private ScheduledFuture monitorFuture;
public AbstractProtocol(AbstractEndpoint endpoint) {
this.endpoint = endpoint;
ConnectionHandler cHandler = new ConnectionHandler<>(this);
getEndpoint().setHandler(cHandler);
setHandler(cHandler);
setConnectionLinger(Constants.DEFAULT_CONNECTION_LINGER);
setTcpNoDelay(Constants.DEFAULT_TCP_NO_DELAY);
}
// ----------------------------------------------- Generic property handling
/**
* Generic property setter used by the digester. Other code should not need to use this. The digester will only use
* this method if it can't find a more specific setter. That means the property belongs to the Endpoint, the
* ServerSocketFactory or some other lower level component. This method ensures that it is visible to both.
*
* @param name The name of the property to set
* @param value The value, in string form, to set for the property
*
* @return true if the property was set successfully, otherwise false
*/
public boolean setProperty(String name, String value) {
return endpoint.setProperty(name, value);
}
/**
* Generic property getter used by the digester. Other code should not need to use this.
*
* @param name The name of the property to get
*
* @return The value of the property converted to a string
*/
public String getProperty(String name) {
return endpoint.getProperty(name);
}
// ------------------------------- Properties managed by the ProtocolHandler
/**
* Name of MBean for the Global Request Processor.
*/
protected ObjectName rgOname = null;
public ObjectName getGlobalRequestProcessorMBeanName() {
return rgOname;
}
/**
* The adapter provides the link between the ProtocolHandler and the connector.
*/
protected Adapter adapter;
@Override
public void setAdapter(Adapter adapter) {
this.adapter = adapter;
}
@Override
public Adapter getAdapter() {
return adapter;
}
/**
* The maximum number of idle processors that will be retained in the cache and re-used with a subsequent request.
* The default is 200. A value of -1 means unlimited. In the unlimited case, the theoretical maximum number of
* cached Processor objects is {@link #getMaxConnections()} although it will usually be closer to
* {@link #getMaxThreads()}.
*/
protected int processorCache = 200;
public int getProcessorCache() {
return this.processorCache;
}
public void setProcessorCache(int processorCache) {
this.processorCache = processorCache;
}
private String clientCertProvider = null;
/**
* When client certificate information is presented in a form other than instances of
* {@link java.security.cert.X509Certificate} it needs to be converted before it can be used and this property
* controls which JSSE provider is used to perform the conversion. For example it is used with the AJP connectors
* and with the {@link org.apache.catalina.valves.SSLValve}. If not specified, the default provider will be used.
*
* @return The name of the JSSE provider to use
*/
public String getClientCertProvider() {
return clientCertProvider;
}
public void setClientCertProvider(String s) {
this.clientCertProvider = s;
}
private int maxHeaderCount = 100;
public int getMaxHeaderCount() {
return maxHeaderCount;
}
public void setMaxHeaderCount(int maxHeaderCount) {
this.maxHeaderCount = maxHeaderCount;
}
@Override
public boolean isSendfileSupported() {
return endpoint.getUseSendfile();
}
@Override
public String getId() {
return endpoint.getId();
}
// ---------------------- Properties that are passed through to the EndPoint
@Override
public Executor getExecutor() {
return endpoint.getExecutor();
}
@Override
public void setExecutor(Executor executor) {
endpoint.setExecutor(executor);
}
@Override
public ScheduledExecutorService getUtilityExecutor() {
return endpoint.getUtilityExecutor();
}
@Override
public void setUtilityExecutor(ScheduledExecutorService utilityExecutor) {
endpoint.setUtilityExecutor(utilityExecutor);
}
public int getMaxThreads() {
return endpoint.getMaxThreads();
}
public void setMaxThreads(int maxThreads) {
endpoint.setMaxThreads(maxThreads);
}
public int getMaxConnections() {
return endpoint.getMaxConnections();
}
public void setMaxConnections(int maxConnections) {
endpoint.setMaxConnections(maxConnections);
}
public int getMinSpareThreads() {
return endpoint.getMinSpareThreads();
}
public void setMinSpareThreads(int minSpareThreads) {
endpoint.setMinSpareThreads(minSpareThreads);
}
public int getThreadPriority() {
return endpoint.getThreadPriority();
}
public void setThreadPriority(int threadPriority) {
endpoint.setThreadPriority(threadPriority);
}
public int getAcceptCount() {
return endpoint.getAcceptCount();
}
public void setAcceptCount(int acceptCount) {
endpoint.setAcceptCount(acceptCount);
}
public boolean getTcpNoDelay() {
return endpoint.getTcpNoDelay();
}
public void setTcpNoDelay(boolean tcpNoDelay) {
endpoint.setTcpNoDelay(tcpNoDelay);
}
public int getConnectionLinger() {
return endpoint.getConnectionLinger();
}
public void setConnectionLinger(int connectionLinger) {
endpoint.setConnectionLinger(connectionLinger);
}
/**
* The time Tomcat will wait for a subsequent request before closing the connection. The default is
* {@link #getConnectionTimeout()}.
*
* @return The timeout in milliseconds
*/
public int getKeepAliveTimeout() {
return endpoint.getKeepAliveTimeout();
}
public void setKeepAliveTimeout(int keepAliveTimeout) {
endpoint.setKeepAliveTimeout(keepAliveTimeout);
}
public InetAddress getAddress() {
return endpoint.getAddress();
}
public void setAddress(InetAddress ia) {
endpoint.setAddress(ia);
}
public int getPort() {
return endpoint.getPort();
}
public void setPort(int port) {
endpoint.setPort(port);
}
public int getPortOffset() {
return endpoint.getPortOffset();
}
public void setPortOffset(int portOffset) {
endpoint.setPortOffset(portOffset);
}
public int getPortWithOffset() {
return endpoint.getPortWithOffset();
}
public int getLocalPort() {
return endpoint.getLocalPort();
}
/*
* When Tomcat expects data from the client, this is the time Tomcat will wait for that data to arrive before
* closing the connection.
*/
public int getConnectionTimeout() {
return endpoint.getConnectionTimeout();
}
public void setConnectionTimeout(int timeout) {
endpoint.setConnectionTimeout(timeout);
}
public long getConnectionCount() {
return endpoint.getConnectionCount();
}
public void setAcceptorThreadPriority(int threadPriority) {
endpoint.setAcceptorThreadPriority(threadPriority);
}
public int getAcceptorThreadPriority() {
return endpoint.getAcceptorThreadPriority();
}
// ---------------------------------------------------------- Public methods
public synchronized int getNameIndex() {
if (nameIndex == 0) {
nameIndex = nameCounter.incrementAndGet();
}
return nameIndex;
}
/**
* The name will be prefix-address-port if address is non-null and prefix-port if the address is null.
*
* @return A name for this protocol instance that is appropriately quoted for use in an ObjectName.
*/
public String getName() {
return ObjectName.quote(getNameInternal());
}
private String getNameInternal() {
StringBuilder name = new StringBuilder(getNamePrefix());
name.append('-');
String id = getId();
if (id != null) {
name.append(id);
} else {
if (getAddress() != null) {
name.append(getAddress().getHostAddress());
name.append('-');
}
int port = getPortWithOffset();
if (port == 0) {
// Auto binding is in use. Check if port is known
name.append("auto-");
name.append(getNameIndex());
port = getLocalPort();
if (port != -1) {
name.append('-');
name.append(port);
}
} else {
name.append(port);
}
}
return name.toString();
}
public void addWaitingProcessor(Processor processor) {
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractProtocol.waitingProcessor.add", processor));
}
waitingProcessors.add(processor);
}
public void removeWaitingProcessor(Processor processor) {
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractProtocol.waitingProcessor.remove", processor));
}
waitingProcessors.remove(processor);
}
/*
* Primarily for debugging and testing. Could be exposed via JMX if considered useful.
*/
public int getWaitingProcessorCount() {
return waitingProcessors.size();
}
// ----------------------------------------------- Accessors for sub-classes
protected AbstractEndpoint getEndpoint() {
return endpoint;
}
protected Handler getHandler() {
return handler;
}
protected void setHandler(Handler handler) {
this.handler = handler;
}
// -------------------------------------------------------- Abstract methods
/**
* Concrete implementations need to provide access to their logger to be used by the abstract classes.
*
* @return the logger
*/
protected abstract Log getLog();
/**
* Obtain the prefix to be used when construction a name for this protocol handler. The name will be
* prefix-address-port.
*
* @return the prefix
*/
protected abstract String getNamePrefix();
/**
* Obtain the name of the protocol, (Http, Ajp, etc.). Used with JMX.
*
* @return the protocol name
*/
protected abstract String getProtocolName();
/**
* Find a suitable handler for the protocol negotiated at the network layer.
*
* @param name The name of the requested negotiated protocol.
*
* @return The instance where {@link UpgradeProtocol#getAlpnName()} matches the requested protocol
*/
protected abstract UpgradeProtocol getNegotiatedProtocol(String name);
/**
* Find a suitable handler for the protocol upgraded name specified. This is used for direct connection protocol
* selection.
*
* @param name The name of the requested negotiated protocol.
*
* @return The instance where {@link UpgradeProtocol#getAlpnName()} matches the requested protocol
*/
protected abstract UpgradeProtocol getUpgradeProtocol(String name);
/**
* Create and configure a new Processor instance for the current protocol implementation.
*
* @return A fully configured Processor instance that is ready to use
*/
protected abstract Processor createProcessor();
protected abstract Processor createUpgradeProcessor(SocketWrapperBase socket, UpgradeToken upgradeToken);
// ----------------------------------------------------- JMX related methods
protected String domain;
protected ObjectName oname;
protected MBeanServer mserver;
public ObjectName getObjectName() {
return oname;
}
public String getDomain() {
return domain;
}
@Override
public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception {
oname = name;
mserver = server;
domain = name.getDomain();
return name;
}
@Override
public void postRegister(Boolean registrationDone) {
// NOOP
}
@Override
public void preDeregister() throws Exception {
// NOOP
}
@Override
public void postDeregister() {
// NOOP
}
private ObjectName createObjectName() throws MalformedObjectNameException {
// Use the same domain as the connector
domain = getAdapter().getDomain();
if (domain == null) {
return null;
}
StringBuilder name = new StringBuilder(getDomain());
name.append(":type=ProtocolHandler,port=");
int port = getPortWithOffset();
if (port > 0) {
name.append(port);
} else {
name.append("auto-");
name.append(getNameIndex());
}
InetAddress address = getAddress();
if (address != null) {
name.append(",address=");
name.append(ObjectName.quote(address.getHostAddress()));
}
return new ObjectName(name.toString());
}
// ------------------------------------------------------- Lifecycle methods
/*
* NOTE: There is no maintenance of state or checking for valid transitions within this class. It is expected that
* the connector will maintain state and prevent invalid state transitions.
*/
@Override
public void init() throws Exception {
if (getLog().isInfoEnabled()) {
getLog().info(sm.getString("abstractProtocolHandler.init", getName()));
logPortOffset();
}
if (oname == null) {
// Component not pre-registered so register it
oname = createObjectName();
if (oname != null) {
Registry.getRegistry(null, null).registerComponent(this, oname, null);
}
}
if (this.domain != null) {
ObjectName rgOname = new ObjectName(domain + ":type=GlobalRequestProcessor,name=" + getName());
this.rgOname = rgOname;
Registry.getRegistry(null, null).registerComponent(getHandler().getGlobal(), rgOname, null);
}
String endpointName = getName();
endpoint.setName(endpointName.substring(1, endpointName.length() - 1));
endpoint.setDomain(domain);
endpoint.init();
}
@Override
public void start() throws Exception {
if (getLog().isInfoEnabled()) {
getLog().info(sm.getString("abstractProtocolHandler.start", getName()));
logPortOffset();
}
endpoint.start();
monitorFuture = getUtilityExecutor().scheduleWithFixedDelay(() -> {
startAsyncTimeout();
}, 0, 60, TimeUnit.SECONDS);
}
/**
* Note: The name of this method originated with the Servlet 3.0 asynchronous processing but evolved over time to
* represent a timeout that is triggered independently of the socket read/write timeouts.
*/
protected void startAsyncTimeout() {
if (timeoutFuture == null || timeoutFuture.isDone()) {
if (timeoutFuture != null && timeoutFuture.isDone()) {
// There was an error executing the scheduled task, get it and log it
try {
timeoutFuture.get();
} catch (InterruptedException | ExecutionException e) {
getLog().error(sm.getString("abstractProtocolHandler.asyncTimeoutError"), e);
}
}
timeoutFuture = getUtilityExecutor().scheduleAtFixedRate(() -> {
long now = System.currentTimeMillis();
for (Processor processor : waitingProcessors) {
processor.timeoutAsync(now);
}
}, 1, 1, TimeUnit.SECONDS);
}
}
protected void stopAsyncTimeout() {
if (timeoutFuture != null) {
timeoutFuture.cancel(false);
timeoutFuture = null;
}
}
@Override
public void pause() throws Exception {
if (getLog().isInfoEnabled()) {
getLog().info(sm.getString("abstractProtocolHandler.pause", getName()));
}
endpoint.pause();
}
public boolean isPaused() {
return endpoint.isPaused();
}
@Override
public void resume() throws Exception {
if (getLog().isInfoEnabled()) {
getLog().info(sm.getString("abstractProtocolHandler.resume", getName()));
}
endpoint.resume();
}
@Override
public void stop() throws Exception {
if (getLog().isInfoEnabled()) {
getLog().info(sm.getString("abstractProtocolHandler.stop", getName()));
logPortOffset();
}
if (monitorFuture != null) {
monitorFuture.cancel(true);
monitorFuture = null;
}
stopAsyncTimeout();
// Timeout any waiting processor
for (Processor processor : waitingProcessors) {
processor.timeoutAsync(-1);
}
endpoint.stop();
}
@Override
public void destroy() throws Exception {
if (getLog().isInfoEnabled()) {
getLog().info(sm.getString("abstractProtocolHandler.destroy", getName()));
logPortOffset();
}
try {
endpoint.destroy();
} finally {
if (oname != null) {
if (mserver == null) {
Registry.getRegistry(null, null).unregisterComponent(oname);
} else {
// Possibly registered with a different MBeanServer
try {
mserver.unregisterMBean(oname);
} catch (MBeanRegistrationException | InstanceNotFoundException e) {
getLog().info(sm.getString("abstractProtocol.mbeanDeregistrationFailed", oname, mserver));
}
}
}
ObjectName rgOname = getGlobalRequestProcessorMBeanName();
if (rgOname != null) {
Registry.getRegistry(null, null).unregisterComponent(rgOname);
}
}
}
@Override
public void closeServerSocketGraceful() {
endpoint.closeServerSocketGraceful();
}
@Override
public long awaitConnectionsClose(long waitMillis) {
getLog().info(sm.getString("abstractProtocol.closeConnectionsAwait", Long.valueOf(waitMillis), getName()));
return endpoint.awaitConnectionsClose(waitMillis);
}
private void logPortOffset() {
if (getPort() != getPortWithOffset()) {
getLog().info(sm.getString("abstractProtocolHandler.portOffset", getName(), String.valueOf(getPort()),
String.valueOf(getPortOffset())));
}
}
// ------------------------------------------- Connection handler base class
protected static class ConnectionHandler implements AbstractEndpoint.Handler {
private final AbstractProtocol proto;
private final RequestGroupInfo global = new RequestGroupInfo();
private final AtomicLong registerCount = new AtomicLong(0);
private final RecycledProcessors recycledProcessors = new RecycledProcessors(this);
public ConnectionHandler(AbstractProtocol proto) {
this.proto = proto;
}
protected AbstractProtocol getProtocol() {
return proto;
}
protected Log getLog() {
return getProtocol().getLog();
}
@Override
public Object getGlobal() {
return global;
}
@Override
public void recycle() {
recycledProcessors.clear();
}
@Override
public SocketState process(SocketWrapperBase wrapper, SocketEvent status) {
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.process", wrapper.getSocket(), status));
}
if (wrapper == null) {
// Nothing to do. Socket has been closed.
return SocketState.CLOSED;
}
S socket = wrapper.getSocket();
// We take complete ownership of the Processor inside of this method to ensure
// no other thread can release it while we're using it. Whatever processor is
// held by this variable will be associated with the SocketWrapper before this
// method returns.
Processor processor = (Processor) wrapper.takeCurrentProcessor();
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.connectionsGet", processor, socket));
}
// Timeouts are calculated on a dedicated thread and then
// dispatched. Because of delays in the dispatch process, the
// timeout may no longer be required. Check here and avoid
// unnecessary processing.
if (SocketEvent.TIMEOUT == status && (processor == null || !processor.isAsync() && !processor.isUpgrade() ||
processor.isAsync() && !processor.checkAsyncTimeoutGeneration())) {
// This is effectively a NO-OP
return SocketState.OPEN;
}
if (processor != null) {
// Make sure an async timeout doesn't fire
getProtocol().removeWaitingProcessor(processor);
} else if (status == SocketEvent.DISCONNECT || status == SocketEvent.ERROR) {
// Nothing to do. Endpoint requested a close and there is no
// longer a processor associated with this socket.
return SocketState.CLOSED;
}
try {
if (processor == null) {
String negotiatedProtocol = wrapper.getNegotiatedProtocol();
// OpenSSL typically returns null whereas JSSE typically
// returns "" when no protocol is negotiated
if (negotiatedProtocol != null && negotiatedProtocol.length() > 0) {
UpgradeProtocol upgradeProtocol = getProtocol().getNegotiatedProtocol(negotiatedProtocol);
if (upgradeProtocol != null) {
processor = upgradeProtocol.getProcessor(wrapper, getProtocol().getAdapter());
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.processorCreate", processor));
}
} else if (negotiatedProtocol.equals("http/1.1")) {
// Explicitly negotiated the default protocol.
// Obtain a processor below.
} else {
// TODO:
// OpenSSL 1.0.2's ALPN callback doesn't support
// failing the handshake with an error if no
// protocol can be negotiated. Therefore, we need to
// fail the connection here. Once this is fixed,
// replace the code below with the commented out
// block.
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.negotiatedProcessor.fail",
negotiatedProtocol));
}
return SocketState.CLOSED;
/*
* To replace the code above once OpenSSL 1.1.0 is used. // Failed to create processor. This
* is a bug. throw new IllegalStateException(sm.getString(
* "abstractConnectionHandler.negotiatedProcessor.fail", negotiatedProtocol));
*/
}
}
}
if (processor == null) {
processor = recycledProcessors.pop();
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.processorPop", processor));
}
}
if (processor == null) {
processor = getProtocol().createProcessor();
register(processor);
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("abstractConnectionHandler.processorCreate", processor));
}
}
processor.setSslSupport(wrapper.getSslSupport());
SocketState state = SocketState.CLOSED;
do {
state = processor.process(wrapper, status);
if (state == SocketState.UPGRADING) {
// Get the HTTP upgrade handler
UpgradeToken upgradeToken = processor.getUpgradeToken();
// Restore leftover input to the wrapper so the upgrade
// processor can process it.
ByteBuffer leftOverInput = processor.getLeftoverInput();
wrapper.unRead(leftOverInput);
if (upgradeToken == null) {
// Assume direct HTTP/2 connection
UpgradeProtocol upgradeProtocol = getProtocol().getUpgradeProtocol("h2c");
if (upgradeProtocol != null) {
// Release the Http11 processor to be re-used
release(processor);
// Create the upgrade processor
processor = upgradeProtocol.getProcessor(wrapper, getProtocol().getAdapter());
} else {
if (getLog().isDebugEnabled()) {
getLog().debug(
sm.getString("abstractConnectionHandler.negotiatedProcessor.fail", "h2c"));
}
// Exit loop and trigger appropriate clean-up
state = SocketState.CLOSED;
}
} else {
HttpUpgradeHandler httpUpgradeHandler = upgradeToken.getHttpUpgradeHandler();
// Release the Http11 processor to be re-used
release(processor);
// Create the upgrade processor
processor = getProtocol().createUpgradeProcessor(wrapper, upgradeToken);
if (getLog().isDebugEnabled()) {
getLog().debug(
sm.getString("abstractConnectionHandler.upgradeCreate", processor, wrapper));
}
// Initialise the upgrade handler (which may trigger
// some IO using the new protocol which is why the lines
// above are necessary)
// This cast should be safe. If it fails the error
// handling for the surrounding try/catch will deal with
// it.
if (upgradeToken.getInstanceManager() == null) {
httpUpgradeHandler.init((WebConnection) processor);
} else {
ClassLoader oldCL = upgradeToken.getContextBind().bind(false, null);
try {
httpUpgradeHandler.init((WebConnection) processor);
} finally {
upgradeToken.getContextBind().unbind(false, oldCL);
}
}
if (httpUpgradeHandler instanceof InternalHttpUpgradeHandler) {
if (((InternalHttpUpgradeHandler) httpUpgradeHandler).hasAsyncIO()) {
// The handler will initiate all further I/O
state = SocketState.ASYNC_IO;
}
}
}
}
} while (state == SocketState.UPGRADING);
if (state == SocketState.LONG) {
// In the middle of processing a request/response. Keep the
// socket associated with the processor. Exact requirements
// depend on type of long poll
longPoll(wrapper, processor);
if (processor.isAsync()) {
getProtocol().addWaitingProcessor(processor);
}
} else if (state == SocketState.OPEN) {
// In keep-alive but between requests. OK to recycle
// processor. Continue to poll for the next request.
release(processor);
processor = null;
wrapper.registerReadInterest();
} else if (state == SocketState.SENDFILE) {
// Sendfile in progress. If it fails, the socket will be
// closed. If it works, the socket either be added to the
// poller (or equivalent) to await more data or processed
// if there are any pipe-lined requests remaining.
} else if (state == SocketState.UPGRADED) {
// Don't add sockets back to the poller if this was a
// non-blocking write otherwise the poller may trigger
// multiple read events which may lead to thread starvation
// in the connector. The write() method will add this socket
// to the poller if necessary.
if (status != SocketEvent.OPEN_WRITE) {
longPoll(wrapper, processor);
getProtocol().addWaitingProcessor(processor);
}
} else if (state == SocketState.ASYNC_IO) {
// Don't add sockets back to the poller.
// The handler will initiate all further I/O
if (status != SocketEvent.OPEN_WRITE) {
getProtocol().addWaitingProcessor(processor);
}
} else if (state == SocketState.SUSPENDED) {
// Don't add sockets back to the poller.
// The resumeProcessing() method will add this socket
// to the poller.
} else {
// Connection closed. OK to recycle the processor.
// Processors handling upgrades require additional clean-up
// before release.
if (processor != null && processor.isUpgrade()) {
UpgradeToken upgradeToken = processor.getUpgradeToken();
HttpUpgradeHandler httpUpgradeHandler = upgradeToken.getHttpUpgradeHandler();
InstanceManager instanceManager = upgradeToken.getInstanceManager();
if (instanceManager == null) {
httpUpgradeHandler.destroy();
} else {
ClassLoader oldCL = upgradeToken.getContextBind().bind(false, null);
try {
httpUpgradeHandler.destroy();
} finally {
try {
instanceManager.destroyInstance(httpUpgradeHandler);
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
getLog().error(sm.getString("abstractConnectionHandler.error"), e);
}
upgradeToken.getContextBind().unbind(false, oldCL);
}
}
}
release(processor);
processor = null;
}
if (processor != null) {
wrapper.setCurrentProcessor(processor);
}
return state;
} catch (java.net.SocketException e) {
// SocketExceptions are normal
getLog().debug(sm.getString("abstractConnectionHandler.socketexception.debug"), e);
} catch (java.io.IOException e) {
// IOExceptions are normal
getLog().debug(sm.getString("abstractConnectionHandler.ioexception.debug"), e);
} catch (ProtocolException e) {
// Protocol exceptions normally mean the client sent invalid or
// incomplete data.
getLog().debug(sm.getString("abstractConnectionHandler.protocolexception.debug"), e);
}
// Future developers: if you discover any other
// rare-but-nonfatal exceptions, catch them here, and log as
// above.
catch (OutOfMemoryError oome) {
// Try and handle this here to give Tomcat a chance to close the
// connection and prevent clients waiting until they time out.
// Worst case, it isn't recoverable and the attempt at logging
// will trigger another OOME.
getLog().error(sm.getString("abstractConnectionHandler.oome"), oome);
} catch (Throwable e) {
ExceptionUtils.handleThrowable(e);
// any other exception or error is odd. Here we log it
// with "ERROR" level, so it will show up even on
// less-than-verbose logs.
getLog().error(sm.getString("abstractConnectionHandler.error"), e);
}
// Make sure socket/processor is removed from the list of current
// connections
release(processor);
return SocketState.CLOSED;
}
protected void longPoll(SocketWrapperBase socket, Processor processor) {
if (!processor.isAsync()) {
// This is currently only used with HTTP
// Either:
// - this is an upgraded connection
// - the request line/headers have not been completely
// read
socket.registerReadInterest();
}
}
/**
* Expected to be used by the handler once the processor is no longer required. Care must be taken to ensure
* that this method is only called once per processor, after the request processing has completed.
*
* @param processor Processor being released (that was associated with the socket)
*/
private void release(Processor processor) {
if (processor != null) {
processor.recycle();
if (processor.isUpgrade()) {
// While UpgradeProcessor instances should not normally be
// present in waitingProcessors there are various scenarios
// where this can happen. E.g.:
// - when AsyncIO is used
// - WebSocket I/O error on non-container thread
// Err on the side of caution and always try and remove any
// UpgradeProcessor instances from waitingProcessors
getProtocol().removeWaitingProcessor(processor);
} else {
// After recycling, only instances of UpgradeProcessorBase
// will return true for isUpgrade().
// Instances of UpgradeProcessorBase should not be added to
// recycledProcessors since that pool is only for AJP or
// HTTP processors
recycledProcessors.push(processor);
if (getLog().isDebugEnabled()) {
getLog().debug("Pushed Processor [" + processor + "]");
}
}
}
}
/**
* Expected to be used by the Endpoint to release resources on socket close, errors etc.
*/
@Override
public void release(SocketWrapperBase socketWrapper) {
Processor processor = (Processor) socketWrapper.takeCurrentProcessor();
release(processor);
}
protected void register(Processor processor) {
if (getProtocol().getDomain() != null) {
synchronized (this) {
try {
long count = registerCount.incrementAndGet();
RequestInfo rp = processor.getRequest().getRequestProcessor();
rp.setGlobalProcessor(global);
ObjectName rpName = new ObjectName(
getProtocol().getDomain() + ":type=RequestProcessor,worker=" + getProtocol().getName() +
",name=" + getProtocol().getProtocolName() + "Request" + count);
if (getLog().isDebugEnabled()) {
getLog().debug("Register [" + processor + "] as [" + rpName + "]");
}
Registry.getRegistry(null, null).registerComponent(rp, rpName, null);
rp.setRpName(rpName);
} catch (Exception e) {
getLog().warn(sm.getString("abstractProtocol.processorRegisterError"), e);
}
}
}
}
protected void unregister(Processor processor) {
if (getProtocol().getDomain() != null) {
synchronized (this) {
try {
Request r = processor.getRequest();
if (r == null) {
// Probably an UpgradeProcessor
return;
}
RequestInfo rp = r.getRequestProcessor();
rp.setGlobalProcessor(null);
ObjectName rpName = rp.getRpName();
if (getLog().isDebugEnabled()) {
getLog().debug("Unregister [" + rpName + "]");
}
Registry.getRegistry(null, null).unregisterComponent(rpName);
rp.setRpName(null);
} catch (Exception e) {
getLog().warn(sm.getString("abstractProtocol.processorUnregisterError"), e);
}
}
}
}
@Override
public final void pause() {
/*
* Inform all the processors associated with current connections that the endpoint is being paused. Most
* won't care. Those processing multiplexed streams may wish to take action. For example, HTTP/2 may wish to
* stop accepting new streams.
*
* Note that even if the endpoint is resumed, there is (currently) no API to inform the Processors of this.
*/
for (SocketWrapperBase wrapper : proto.getEndpoint().getConnections()) {
Processor processor = (Processor) wrapper.getCurrentProcessor();
if (processor != null) {
processor.pause();
}
}
}
}
protected static class RecycledProcessors extends SynchronizedStack {
private final transient ConnectionHandler handler;
protected final AtomicInteger size = new AtomicInteger(0);
public RecycledProcessors(ConnectionHandler handler) {
this.handler = handler;
}
@SuppressWarnings("sync-override") // Size may exceed cache size a bit
@Override
public boolean push(Processor processor) {
int cacheSize = handler.getProtocol().getProcessorCache();
boolean offer = cacheSize == -1 ? true : size.get() < cacheSize;
// avoid over growing our cache or add after we have stopped
boolean result = false;
if (offer) {
result = super.push(processor);
if (result) {
size.incrementAndGet();
}
}
if (!result) {
handler.unregister(processor);
}
return result;
}
@SuppressWarnings("sync-override") // OK if size is too big briefly
@Override
public Processor pop() {
Processor result = super.pop();
if (result != null) {
size.decrementAndGet();
}
return result;
}
@Override
public synchronized void clear() {
Processor next = pop();
while (next != null) {
handler.unregister(next);
next = pop();
}
super.clear();
size.set(0);
}
}
}
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