jdk-sandbox: comparison src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/internal/HttpClientImpl.java

equal deleted inserted replaced

-:6c11b48a0695
+:d23b02f37fce
+/*
+* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.  Oracle designates this
+* particular file as subject to the "Classpath" exception as provided
+* by Oracle in the LICENSE file that accompanied this code.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*/
+package jdk.incubator.http.internal;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLParameters;
+import java.io.IOException;
+import java.lang.System.Logger.Level;
+import java.lang.ref.WeakReference;
+import java.net.Authenticator;
+import java.net.CookieHandler;
+import java.net.ProxySelector;
+import java.nio.channels.CancelledKeyException;
+import java.nio.channels.ClosedChannelException;
+import java.nio.channels.SelectableChannel;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.Selector;
+import java.nio.channels.SocketChannel;
+import java.security.AccessControlContext;
+import java.security.AccessController;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivilegedAction;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.stream.Stream;
+import jdk.incubator.http.HttpClient;
+import jdk.incubator.http.HttpRequest;
+import jdk.incubator.http.HttpResponse;
+import jdk.incubator.http.HttpResponse.BodyHandler;
+import jdk.incubator.http.HttpResponse.PushPromiseHandler;
+import jdk.incubator.http.WebSocket;
+import jdk.incubator.http.internal.common.Log;
+import jdk.incubator.http.internal.common.Pair;
+import jdk.incubator.http.internal.common.Utils;
+import jdk.incubator.http.internal.websocket.BuilderImpl;
+import jdk.internal.misc.InnocuousThread;
+/**
+* Client implementation. Contains all configuration information and also
+* the selector manager thread which allows async events to be registered
+* and delivered when they occur. See AsyncEvent.
+*/
+class HttpClientImpl extends HttpClient {
+static final boolean DEBUG = Utils.DEBUG;  // Revisit: temporary dev flag.
+static final boolean DEBUGELAPSED = Utils.TESTING || DEBUG;  // Revisit: temporary dev flag.
+static final boolean DEBUGTIMEOUT = false; // Revisit: temporary dev flag.
+final System.Logger  debug = Utils.getDebugLogger(this::dbgString, DEBUG);
+final System.Logger  debugelapsed = Utils.getDebugLogger(this::dbgString, DEBUGELAPSED);
+final System.Logger  debugtimeout = Utils.getDebugLogger(this::dbgString, DEBUGTIMEOUT);
+static final AtomicLong CLIENT_IDS = new AtomicLong();
+// Define the default factory as a static inner class
+// that embeds all the necessary logic to avoid
+// the risk of using a lambda that might keep a reference on the
+// HttpClient instance from which it was created (helps with
+// heapdump analysis).
+private static final class DefaultThreadFactory implements ThreadFactory {
+private final String namePrefix;
+private final AtomicInteger nextId = new AtomicInteger();
+DefaultThreadFactory(long clientID) {
+namePrefix = "HttpClient-" + clientID + "-Worker-";
+}
+@Override
+public Thread newThread(Runnable r) {
+String name = namePrefix + nextId.getAndIncrement();
+Thread t;
+if (System.getSecurityManager() == null) {
+t = new Thread(null, r, name, 0, false);
+} else {
+t = InnocuousThread.newThread(name, r);
+}
+t.setDaemon(true);
+return t;
+}
+}
+private final CookieHandler cookieHandler;
+private final Redirect followRedirects;
+private final Optional<ProxySelector> userProxySelector;
+private final ProxySelector proxySelector;
+private final Authenticator authenticator;
+private final Version version;
+private final ConnectionPool connections;
+private final Executor executor;
+private final boolean isDefaultExecutor;
+// Security parameters
+private final SSLContext sslContext;
+private final SSLParameters sslParams;
+private final SelectorManager selmgr;
+private final FilterFactory filters;
+private final Http2ClientImpl client2;
+private final long id;
+private final String dbgTag;
+// This reference is used to keep track of the facade HttpClient
+// that was returned to the application code.
+// It makes it possible to know when the application no longer
+// holds any reference to the HttpClient.
+// Unfortunately, this information is not enough to know when
+// to exit the SelectorManager thread. Because of the asynchronous
+// nature of the API, we also need to wait until all pending operations
+// have completed.
+private final WeakReference<HttpClientFacade> facadeRef;
+// This counter keeps track of the number of operations pending
+// on the HttpClient. The SelectorManager thread will wait
+// until there are no longer any pending operations and the
+// facadeRef is cleared before exiting.
+//
+// The pendingOperationCount is incremented every time a send/sendAsync
+// operation is invoked on the HttpClient, and is decremented when
+// the HttpResponse<T> object is returned to the user.
+// However, at this point, the body may not have been fully read yet.
+// This is the case when the response T is implemented as a streaming
+// subscriber (such as an InputStream).
+//
+// To take care of this issue the pendingOperationCount will additionally
+// be incremented/decremented in the following cases:
+//
+// 1. For HTTP/2  it is incremented when a stream is added to the
+//    Http2Connection streams map, and decreased when the stream is removed
+//    from the map. This should also take care of push promises.
+// 2. For WebSocket the count is increased when creating a
+//    DetachedConnectionChannel for the socket, and decreased
+//    when the the channel is closed.
+//    In addition, the HttpClient facade is passed to the WebSocket builder,
+//    (instead of the client implementation delegate).
+// 3. For HTTP/1.1 the count is incremented before starting to parse the body
+//    response, and decremented when the parser has reached the end of the
+//    response body flow.
+//
+// This should ensure that the selector manager thread remains alive until
+// the response has been fully received or the web socket is closed.
+private final AtomicLong pendingOperationCount = new AtomicLong();
+private final AtomicLong pendingWebSocketCount = new AtomicLong();
+private final AtomicLong pendingHttpRequestCount = new AtomicLong();
+/** A Set of, deadline first, ordered timeout events. */
+private final TreeSet<TimeoutEvent> timeouts;
+/**
+* This is a bit tricky:
+* 1. an HttpClientFacade has a final HttpClientImpl field.
+* 2. an HttpClientImpl has a final WeakReference<HttpClientFacade> field,
+*    where the referent is the facade created for that instance.
+* 3. We cannot just create the HttpClientFacade in the HttpClientImpl
+*    constructor, because it would be only weakly referenced and could
+*    be GC'ed before we can return it.
+* The solution is to use an instance of SingleFacadeFactory which will
+* allow the caller of new HttpClientImpl(...) to retrieve the facade
+* after the HttpClientImpl has been created.
+*/
+private static final class SingleFacadeFactory {
+HttpClientFacade facade;
+HttpClientFacade createFacade(HttpClientImpl impl) {
+assert facade == null;
+return (facade = new HttpClientFacade(impl));
+}
+}
+static HttpClientFacade create(HttpClientBuilderImpl builder) {
+SingleFacadeFactory facadeFactory = new SingleFacadeFactory();
+HttpClientImpl impl = new HttpClientImpl(builder, facadeFactory);
+impl.start();
+assert facadeFactory.facade != null;
+assert impl.facadeRef.get() == facadeFactory.facade;
+return facadeFactory.facade;
+}
+private HttpClientImpl(HttpClientBuilderImpl builder,
+SingleFacadeFactory facadeFactory) {
+id = CLIENT_IDS.incrementAndGet();
+dbgTag = "HttpClientImpl(" + id +")";
+if (builder.sslContext == null) {
+try {
+sslContext = SSLContext.getDefault();
+} catch (NoSuchAlgorithmException ex) {
+throw new InternalError(ex);
+}
+} else {
+sslContext = builder.sslContext;
+}
+Executor ex = builder.executor;
+if (ex == null) {
+ex = Executors.newCachedThreadPool(new DefaultThreadFactory(id));
+isDefaultExecutor = true;
+} else {
+ex = builder.executor;
+isDefaultExecutor = false;
+}
+facadeRef = new WeakReference<>(facadeFactory.createFacade(this));
+client2 = new Http2ClientImpl(this);
+executor = ex;
+cookieHandler = builder.cookieHandler;
+followRedirects = builder.followRedirects == null ?
+Redirect.NEVER : builder.followRedirects;
+this.userProxySelector = Optional.ofNullable(builder.proxy);
+this.proxySelector = userProxySelector
+.orElseGet(HttpClientImpl::getDefaultProxySelector);
+debug.log(Level.DEBUG, "proxySelector is %s (user-supplied=%s)",
+this.proxySelector, userProxySelector.isPresent());
+authenticator = builder.authenticator;
+if (builder.version == null) {
+version = HttpClient.Version.HTTP_2;
+} else {
+version = builder.version;
+}
+if (builder.sslParams == null) {
+sslParams = getDefaultParams(sslContext);
+} else {
+sslParams = builder.sslParams;
+}
+connections = new ConnectionPool(id);
+connections.start();
+timeouts = new TreeSet<>();
+try {
+selmgr = new SelectorManager(this);
+} catch (IOException e) {
+// unlikely
+throw new InternalError(e);
+}
+selmgr.setDaemon(true);
+filters = new FilterFactory();
+initFilters();
+assert facadeRef.get() != null;
+}
+private void start() {
+selmgr.start();
+}
+// Called from the SelectorManager thread, just before exiting.
+// Clears the HTTP/1.1 and HTTP/2 cache, ensuring that the connections
+// that may be still lingering there are properly closed (and their
+// possibly still opened SocketChannel released).
+private void stop() {
+// Clears HTTP/1.1 cache and close its connections
+connections.stop();
+// Clears HTTP/2 cache and close its connections.
+client2.stop();
+}
+private static SSLParameters getDefaultParams(SSLContext ctx) {
+SSLParameters params = ctx.getSupportedSSLParameters();
+params.setProtocols(new String[]{"TLSv1.2"});
+return params;
+}
+private static ProxySelector getDefaultProxySelector() {
+PrivilegedAction<ProxySelector> action = ProxySelector::getDefault;
+return AccessController.doPrivileged(action);
+}
+// Returns the facade that was returned to the application code.
+// May be null if that facade is no longer referenced.
+final HttpClientFacade facade() {
+return facadeRef.get();
+}
+// Increments the pendingOperationCount.
+final long reference() {
+pendingHttpRequestCount.incrementAndGet();
+return pendingOperationCount.incrementAndGet();
+}
+// Decrements the pendingOperationCount.
+final long unreference() {
+final long count = pendingOperationCount.decrementAndGet();
+final long httpCount = pendingHttpRequestCount.decrementAndGet();
+final long webSocketCount = pendingWebSocketCount.get();
+if (count == 0 && facade() == null) {
+selmgr.wakeupSelector();
+}
+assert httpCount >= 0 : "count of HTTP operations < 0";
+assert webSocketCount >= 0 : "count of WS operations < 0";
+assert count >= 0 : "count of pending operations < 0";
+return count;
+}
+// Increments the pendingOperationCount.
+final long webSocketOpen() {
+pendingWebSocketCount.incrementAndGet();
+return pendingOperationCount.incrementAndGet();
+}
+// Decrements the pendingOperationCount.
+final long webSocketClose() {
+final long count = pendingOperationCount.decrementAndGet();
+final long webSocketCount = pendingWebSocketCount.decrementAndGet();
+final long httpCount = pendingHttpRequestCount.get();
+if (count == 0 && facade() == null) {
+selmgr.wakeupSelector();
+}
+assert httpCount >= 0 : "count of HTTP operations < 0";
+assert webSocketCount >= 0 : "count of WS operations < 0";
+assert count >= 0 : "count of pending operations < 0";
+return count;
+}
+// Returns the pendingOperationCount.
+final long referenceCount() {
+return pendingOperationCount.get();
+}
+// Called by the SelectorManager thread to figure out whether it's time
+// to terminate.
+final boolean isReferenced() {
+HttpClient facade = facade();
+return facade != null || referenceCount() > 0;
+}
+/**
+* Wait for activity on given exchange.
+* The following occurs in the SelectorManager thread.
+*
+*  1) add to selector
+*  2) If selector fires for this exchange then
+*     call AsyncEvent.handle()
+*
+* If exchange needs to change interest ops, then call registerEvent() again.
+*/
+void registerEvent(AsyncEvent exchange) throws IOException {
+selmgr.register(exchange);
+}
+/**
+* Only used from RawChannel to disconnect the channel from
+* the selector
+*/
+void cancelRegistration(SocketChannel s) {
+selmgr.cancel(s);
+}
+/**
+* Allows an AsyncEvent to modify its interestOps.
+* @param event The modified event.
+*/
+void eventUpdated(AsyncEvent event) throws ClosedChannelException {
+assert !(event instanceof AsyncTriggerEvent);
+selmgr.eventUpdated(event);
+}
+boolean isSelectorThread() {
+return Thread.currentThread() == selmgr;
+}
+Http2ClientImpl client2() {
+return client2;
+}
+private void debugCompleted(String tag, long startNanos, HttpRequest req) {
+if (debugelapsed.isLoggable(Level.DEBUG)) {
+debugelapsed.log(Level.DEBUG, () -> tag + " elapsed "
++ (System.nanoTime() - startNanos)/1000_000L
++ " millis for " + req.method()
++ " to " + req.uri());
+}
+}
+@Override
+public <T> HttpResponse<T>
+send(HttpRequest req, BodyHandler<T> responseHandler)
+throws IOException, InterruptedException
+{
+try {
+return sendAsync(req, responseHandler).get();
+} catch (ExecutionException e) {
+Throwable t = e.getCause();
+if (t instanceof Error)
+throw (Error)t;
+if (t instanceof RuntimeException)
+throw (RuntimeException)t;
+else if (t instanceof IOException)
+throw Utils.getIOException(t);
+else
+throw new InternalError("Unexpected exception", t);
+}
+}
+@Override
+public <T> CompletableFuture<HttpResponse<T>>
+sendAsync(HttpRequest userRequest, BodyHandler<T> responseHandler)
+{
+return sendAsync(userRequest, responseHandler, null);
+}
+@Override
+public <T> CompletableFuture<HttpResponse<T>>
+sendAsync(HttpRequest userRequest,
+BodyHandler<T> responseHandler,
+PushPromiseHandler<T> pushPromiseHandler)
+{
+AccessControlContext acc = null;
+if (System.getSecurityManager() != null)
+acc = AccessController.getContext();
+// Clone the, possibly untrusted, HttpRequest
+HttpRequestImpl requestImpl = new HttpRequestImpl(userRequest, proxySelector, acc);
+if (requestImpl.method().equals("CONNECT"))
+throw new IllegalArgumentException("Unsupported method CONNECT");
+long start = DEBUGELAPSED ? System.nanoTime() : 0;
+reference();
+try {
+debugelapsed.log(Level.DEBUG, "ClientImpl (async) send %s", userRequest);
+MultiExchange<T> mex = new MultiExchange<>(userRequest,
+requestImpl,
+this,
+responseHandler,
+pushPromiseHandler,
+acc);
+CompletableFuture<HttpResponse<T>> res =
+mex.responseAsync().whenComplete((b,t) -> unreference());
+if (DEBUGELAPSED) {
+res = res.whenComplete(
+(b,t) -> debugCompleted("ClientImpl (async)", start, userRequest));
+}
+// makes sure that any dependent actions happen in the executor
+if (acc != null) {
+res.whenCompleteAsync((r, t) -> { /* do nothing */},
+new PrivilegedExecutor(executor, acc));
+}
+return res;
+} catch(Throwable t) {
+unreference();
+debugCompleted("ClientImpl (async)", start, userRequest);
+throw t;
+}
+}
+// Main loop for this client's selector
+private final static class SelectorManager extends Thread {
+// For testing purposes we have an internal System property that
+// can control the frequency at which the selector manager will wake
+// up when there are no pending operations.
+// Increasing the frequency (shorter delays) might allow the selector
+// to observe that the facade is no longer referenced and might allow
+// the selector thread to terminate more timely - for when nothing is
+// ongoing it will only check for that condition every NODEADLINE ms.
+// To avoid misuse of the property, the delay that can be specified
+// is comprised between [MIN_NODEADLINE, MAX_NODEADLINE], and its default
+// value if unspecified (or <= 0) is DEF_NODEADLINE = 3000ms
+// The property is -Djdk.httpclient.internal.selector.timeout=<millis>
+private static final int MIN_NODEADLINE = 1000; // ms
+private static final int MAX_NODEADLINE = 1000 * 1200; // ms
+private static final int DEF_NODEADLINE = 3000; // ms
+private static final long NODEADLINE; // default is DEF_NODEADLINE ms
+static {
+// ensure NODEADLINE is initialized with some valid value.
+long deadline =  Utils.getIntegerNetProperty(
+"jdk.httpclient.internal.selector.timeout",
+DEF_NODEADLINE); // millis
+if (deadline <= 0) deadline = DEF_NODEADLINE;
+deadline = Math.max(deadline, MIN_NODEADLINE);
+NODEADLINE = Math.min(deadline, MAX_NODEADLINE);
+}
+private final Selector selector;
+private volatile boolean closed;
+private final List<AsyncEvent> registrations;
+private final System.Logger debug;
+private final System.Logger debugtimeout;
+HttpClientImpl owner;
+ConnectionPool pool;
+SelectorManager(HttpClientImpl ref) throws IOException {
+super(null, null, "HttpClient-" + ref.id + "-SelectorManager", 0, false);
+owner = ref;
+debug = ref.debug;
+debugtimeout = ref.debugtimeout;
+pool = ref.connectionPool();
+registrations = new ArrayList<>();
+selector = Selector.open();
+}
+void eventUpdated(AsyncEvent e) throws ClosedChannelException {
+if (Thread.currentThread() == this) {
+SelectionKey key = e.channel().keyFor(selector);
+SelectorAttachment sa = (SelectorAttachment) key.attachment();
+if (sa != null) sa.register(e);
+} else {
+register(e);
+}
+}
+// This returns immediately. So caller not allowed to send/receive
+// on connection.
+synchronized void register(AsyncEvent e) {
+registrations.add(e);
+selector.wakeup();
+}
+synchronized void cancel(SocketChannel e) {
+SelectionKey key = e.keyFor(selector);
+if (key != null) {
+key.cancel();
+}
+selector.wakeup();
+}
+void wakeupSelector() {
+selector.wakeup();
+}
+synchronized void shutdown() {
+debug.log(Level.DEBUG, "SelectorManager shutting down");
+closed = true;
+try {
+selector.close();
+} catch (IOException ignored) {
+} finally {
+owner.stop();
+}
+}
+@Override
+public void run() {
+List<Pair<AsyncEvent,IOException>> errorList = new ArrayList<>();
+List<AsyncEvent> readyList = new ArrayList<>();
+try {
+while (!Thread.currentThread().isInterrupted()) {
+synchronized (this) {
+assert errorList.isEmpty();
+assert readyList.isEmpty();
+for (AsyncEvent event : registrations) {
+if (event instanceof AsyncTriggerEvent) {
+readyList.add(event);
+continue;
+}
+SelectableChannel chan = event.channel();
+SelectionKey key = null;
+try {
+key = chan.keyFor(selector);
+SelectorAttachment sa;
+if (key == null || !key.isValid()) {
+if (key != null) {
+// key is canceled.
+// invoke selectNow() to purge it
+// before registering the new event.
+selector.selectNow();
+}
+sa = new SelectorAttachment(chan, selector);
+} else {
+sa = (SelectorAttachment) key.attachment();
+}
+// may throw IOE if channel closed: that's OK
+sa.register(event);
+if (!chan.isOpen()) {
+throw new IOException("Channel closed");
+}
+} catch (IOException e) {
+Log.logTrace("HttpClientImpl: " + e);
+debug.log(Level.DEBUG, () ->
+"Got " + e.getClass().getName()
++ " while handling"
++ " registration events");
+chan.close();
+// let the event abort deal with it
+errorList.add(new Pair<>(event, e));
+if (key != null) {
+key.cancel();
+selector.selectNow();
+}
+}
+}
+registrations.clear();
+selector.selectedKeys().clear();
+}
+for (AsyncEvent event : readyList) {
+assert event instanceof AsyncTriggerEvent;
+event.handle();
+}
+readyList.clear();
+for (Pair<AsyncEvent,IOException> error : errorList) {
+// an IOException was raised and the channel closed.
+handleEvent(error.first, error.second);
+}
+errorList.clear();
+// Check whether client is still alive, and if not,
+// gracefully stop this thread
+if (!owner.isReferenced()) {
+Log.logTrace("HttpClient no longer referenced. Exiting...");
+return;
+}
+// Timeouts will have milliseconds granularity. It is important
+// to handle them in a timely fashion.
+long nextTimeout = owner.purgeTimeoutsAndReturnNextDeadline();
+debugtimeout.log(Level.DEBUG, "next timeout: %d", nextTimeout);
+// Keep-alive have seconds granularity. It's not really an
+// issue if we keep connections linger a bit more in the keep
+// alive cache.
+long nextExpiry = pool.purgeExpiredConnectionsAndReturnNextDeadline();
+debugtimeout.log(Level.DEBUG, "next expired: %d", nextExpiry);
+assert nextTimeout >= 0;
+assert nextExpiry >= 0;
+// Don't wait for ever as it might prevent the thread to
+// stop gracefully. millis will be 0 if no deadline was found.
+if (nextTimeout <= 0) nextTimeout = NODEADLINE;
+// Clip nextExpiry at NODEADLINE limit. The default
+// keep alive is 1200 seconds (half an hour) - we don't
+// want to wait that long.
+if (nextExpiry <= 0) nextExpiry = NODEADLINE;
+else nextExpiry = Math.min(NODEADLINE, nextExpiry);
+// takes the least of the two.
+long millis = Math.min(nextExpiry, nextTimeout);
+debugtimeout.log(Level.DEBUG, "Next deadline is %d",
+(millis == 0 ? NODEADLINE : millis));
+//debugPrint(selector);
+int n = selector.select(millis == 0 ? NODEADLINE : millis);
+if (n == 0) {
+// Check whether client is still alive, and if not,
+// gracefully stop this thread
+if (!owner.isReferenced()) {
+Log.logTrace("HttpClient no longer referenced. Exiting...");
+return;
+}
+owner.purgeTimeoutsAndReturnNextDeadline();
+continue;
+}
+Set<SelectionKey> keys = selector.selectedKeys();
+assert errorList.isEmpty();
+for (SelectionKey key : keys) {
+SelectorAttachment sa = (SelectorAttachment) key.attachment();
+if (!key.isValid()) {
+IOException ex = sa.chan.isOpen()
+? new IOException("Invalid key")
+: new ClosedChannelException();
+sa.pending.forEach(e -> errorList.add(new Pair<>(e,ex)));
+sa.pending.clear();
+continue;
+}
+int eventsOccurred;
+try {
+eventsOccurred = key.readyOps();
+} catch (CancelledKeyException ex) {
+IOException io = Utils.getIOException(ex);
+sa.pending.forEach(e -> errorList.add(new Pair<>(e,io)));
+sa.pending.clear();
+continue;
+}
+sa.events(eventsOccurred).forEach(readyList::add);
+sa.resetInterestOps(eventsOccurred);
+}
+selector.selectNow(); // complete cancellation
+selector.selectedKeys().clear();
+for (AsyncEvent event : readyList) {
+handleEvent(event, null); // will be delegated to executor
+}
+readyList.clear();
+errorList.forEach((p) -> handleEvent(p.first, p.second));
+errorList.clear();
+}
+} catch (Throwable e) {
+//e.printStackTrace();
+if (!closed) {
+// This terminates thread. So, better just print stack trace
+String err = Utils.stackTrace(e);
+Log.logError("HttpClientImpl: fatal error: " + err);
+}
+debug.log(Level.DEBUG, "shutting down", e);
+if (Utils.ASSERTIONSENABLED && !debug.isLoggable(Level.DEBUG)) {
+e.printStackTrace(System.err); // always print the stack
+}
+} finally {
+shutdown();
+}
+}
+//        void debugPrint(Selector selector) {
+//            System.err.println("Selector: debugprint start");
+//            Set<SelectionKey> keys = selector.keys();
+//            for (SelectionKey key : keys) {
+//                SelectableChannel c = key.channel();
+//                int ops = key.interestOps();
+//                System.err.printf("selector chan:%s ops:%d\n", c, ops);
+//            }
+//            System.err.println("Selector: debugprint end");
+//        }
+/** Handles the given event. The given ioe may be null. */
+void handleEvent(AsyncEvent event, IOException ioe) {
+if (closed || ioe != null) {
+event.abort(ioe);
+} else {
+event.handle();
+}
+}
+}
+/**
+* Tracks multiple user level registrations associated with one NIO
+* registration (SelectionKey). In this implementation, registrations
+* are one-off and when an event is posted the registration is cancelled
+* until explicitly registered again.
+*
+* <p> No external synchronization required as this class is only used
+* by the SelectorManager thread. One of these objects required per
+* connection.
+*/
+private static class SelectorAttachment {
+private final SelectableChannel chan;
+private final Selector selector;
+private final Set<AsyncEvent> pending;
+private final static System.Logger debug =
+Utils.getDebugLogger("SelectorAttachment"::toString, DEBUG);
+private int interestOps;
+SelectorAttachment(SelectableChannel chan, Selector selector) {
+this.pending = new HashSet<>();
+this.chan = chan;
+this.selector = selector;
+}
+void register(AsyncEvent e) throws ClosedChannelException {
+int newOps = e.interestOps();
+boolean reRegister = (interestOps & newOps) != newOps;
+interestOps |= newOps;
+pending.add(e);
+if (reRegister) {
+// first time registration happens here also
+chan.register(selector, interestOps, this);
+}
+}
+/**
+* Returns a Stream<AsyncEvents> containing only events that are
+* registered with the given {@code interestOps}.
+*/
+Stream<AsyncEvent> events(int interestOps) {
+return pending.stream()
+.filter(ev -> (ev.interestOps() & interestOps) != 0);
+}
+/**
+* Removes any events with the given {@code interestOps}, and if no
+* events remaining, cancels the associated SelectionKey.
+*/
+void resetInterestOps(int interestOps) {
+int newOps = 0;
+Iterator<AsyncEvent> itr = pending.iterator();
+while (itr.hasNext()) {
+AsyncEvent event = itr.next();
+int evops = event.interestOps();
+if (event.repeating()) {
+newOps |= evops;
+continue;
+}
+if ((evops & interestOps) != 0) {
+itr.remove();
+} else {
+newOps |= evops;
+}
+}
+this.interestOps = newOps;
+SelectionKey key = chan.keyFor(selector);
+if (newOps == 0 && pending.isEmpty()) {
+key.cancel();
+} else {
+try {
+key.interestOps(newOps);
+} catch (CancelledKeyException x) {
+// channel may have been closed
+debug.log(Level.DEBUG, "key cancelled for " + chan);
+abortPending(x);
+}
+}
+}
+void abortPending(Throwable x) {
+if (!pending.isEmpty()) {
+AsyncEvent[] evts = pending.toArray(new AsyncEvent[0]);
+pending.clear();
+IOException io = Utils.getIOException(x);
+for (AsyncEvent event : evts) {
+event.abort(io);
+}
+}
+}
+}
+/*package-private*/ SSLContext theSSLContext() {
+return sslContext;
+}
+@Override
+public SSLContext sslContext() {
+return sslContext;
+}
+@Override
+public SSLParameters sslParameters() {
+return Utils.copySSLParameters(sslParams);
+}
+@Override
+public Optional<Authenticator> authenticator() {
+return Optional.ofNullable(authenticator);
+}
+/*package-private*/ final Executor theExecutor() {
+return executor;
+}
+@Override
+public final Optional<Executor> executor() {
+return isDefaultExecutor ? Optional.empty() : Optional.of(executor);
+}
+ConnectionPool connectionPool() {
+return connections;
+}
+@Override
+public Redirect followRedirects() {
+return followRedirects;
+}
+@Override
+public Optional<CookieHandler> cookieHandler() {
+return Optional.ofNullable(cookieHandler);
+}
+@Override
+public Optional<ProxySelector> proxy() {
+return this.userProxySelector;
+}
+// Return the effective proxy that this client uses.
+ProxySelector proxySelector() {
+return proxySelector;
+}
+@Override
+public WebSocket.Builder newWebSocketBuilder() {
+// Make sure to pass the HttpClientFacade to the WebSocket builder.
+// This will ensure that the facade is not released before the
+// WebSocket has been created, at which point the pendingOperationCount
+// will have been incremented by the DetachedConnectionChannel
+// (see PlainHttpConnection.detachChannel())
+return new BuilderImpl(this.facade(), proxySelector);
+}
+@Override
+public Version version() {
+return version;
+}
+String dbgString() {
+return dbgTag;
+}
+@Override
+public String toString() {
+// Used by tests to get the client's id and compute the
+// name of the SelectorManager thread.
+return super.toString() + ("(" + id + ")");
+}
+private void initFilters() {
+addFilter(AuthenticationFilter.class);
+addFilter(RedirectFilter.class);
+if (this.cookieHandler != null) {
+addFilter(CookieFilter.class);
+}
+}
+private void addFilter(Class<? extends HeaderFilter> f) {
+filters.addFilter(f);
+}
+final List<HeaderFilter> filterChain() {
+return filters.getFilterChain();
+}
+// Timer controls.
+// Timers are implemented through timed Selector.select() calls.
+synchronized void registerTimer(TimeoutEvent event) {
+Log.logTrace("Registering timer {0}", event);
+timeouts.add(event);
+selmgr.wakeupSelector();
+}
+synchronized void cancelTimer(TimeoutEvent event) {
+Log.logTrace("Canceling timer {0}", event);
+timeouts.remove(event);
+}
+/**
+* Purges ( handles ) timer events that have passed their deadline, and
+* returns the amount of time, in milliseconds, until the next earliest
+* event. A return value of 0 means that there are no events.
+*/
+private long purgeTimeoutsAndReturnNextDeadline() {
+long diff = 0L;
+List<TimeoutEvent> toHandle = null;
+int remaining = 0;
+// enter critical section to retrieve the timeout event to handle
+synchronized(this) {
+if (timeouts.isEmpty()) return 0L;
+Instant now = Instant.now();
+Iterator<TimeoutEvent> itr = timeouts.iterator();
+while (itr.hasNext()) {
+TimeoutEvent event = itr.next();
+diff = now.until(event.deadline(), ChronoUnit.MILLIS);
+if (diff <= 0) {
+itr.remove();
+toHandle = (toHandle == null) ? new ArrayList<>() : toHandle;
+toHandle.add(event);
+} else {
+break;
+}
+}
+remaining = timeouts.size();
+}
+// can be useful for debugging
+if (toHandle != null && Log.trace()) {
+Log.logTrace("purgeTimeoutsAndReturnNextDeadline: handling "
++  toHandle.size() + " events, "
++ "remaining " + remaining
++ ", next deadline: " + (diff < 0 ? 0L : diff));
+}
+// handle timeout events out of critical section
+if (toHandle != null) {
+Throwable failed = null;
+for (TimeoutEvent event : toHandle) {
+try {
+Log.logTrace("Firing timer {0}", event);
+event.handle();
+} catch (Error | RuntimeException e) {
+// Not expected. Handle remaining events then throw...
+// If e is an OOME or SOE it might simply trigger a new
+// error from here - but in this case there's not much we
+// could do anyway. Just let it flow...
+if (failed == null) failed = e;
+else failed.addSuppressed(e);
+Log.logTrace("Failed to handle event {0}: {1}", event, e);
+}
+}
+if (failed instanceof Error) throw (Error) failed;
+if (failed instanceof RuntimeException) throw (RuntimeException) failed;
+}
+// return time to wait until next event. 0L if there's no more events.
+return diff < 0 ? 0L : diff;
+}
+// used for the connection window
+int getReceiveBufferSize() {
+return Utils.getIntegerNetProperty(
+"jdk.httpclient.receiveBufferSize", 2 * 1024 * 1024
+);
+}
+}

branch	http-client-branch
changeset 56079	d23b02f37fce
parent 56074	06459c34105f
child 56081	20c6742e5545