| /* |
| * Copyright (c) 2015, 2019, 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.internal.net.http; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.net.http.HttpResponse; |
| import java.net.http.HttpResponse.BodyHandler; |
| import java.net.http.HttpResponse.BodySubscriber; |
| import java.nio.ByteBuffer; |
| import java.util.Objects; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.concurrent.ConcurrentLinkedDeque; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.Flow; |
| import jdk.internal.net.http.common.Demand; |
| import jdk.internal.net.http.common.Log; |
| import jdk.internal.net.http.common.FlowTube; |
| import jdk.internal.net.http.common.Logger; |
| import jdk.internal.net.http.common.SequentialScheduler; |
| import jdk.internal.net.http.common.MinimalFuture; |
| import jdk.internal.net.http.common.Utils; |
| import static java.net.http.HttpClient.Version.HTTP_1_1; |
| import static jdk.internal.net.http.common.Utils.wrapWithExtraDetail; |
| |
| /** |
| * Encapsulates one HTTP/1.1 request/response exchange. |
| */ |
| class Http1Exchange<T> extends ExchangeImpl<T> { |
| |
| final Logger debug = Utils.getDebugLogger(this::dbgString, Utils.DEBUG); |
| final HttpRequestImpl request; // main request |
| final Http1Request requestAction; |
| private volatile Http1Response<T> response; |
| final HttpConnection connection; |
| final HttpClientImpl client; |
| final Executor executor; |
| private final Http1AsyncReceiver asyncReceiver; |
| |
| /** Records a possible cancellation raised before any operation |
| * has been initiated, or an error received while sending the request. */ |
| private Throwable failed; |
| private final List<CompletableFuture<?>> operations; // used for cancel |
| |
| /** Must be held when operating on any internal state or data. */ |
| private final Object lock = new Object(); |
| |
| /** Holds the outgoing data, either the headers or a request body part. Or |
| * an error from the request body publisher. At most there can be ~2 pieces |
| * of outgoing data ( onComplete|onError can be invoked without demand ).*/ |
| final ConcurrentLinkedDeque<DataPair> outgoing = new ConcurrentLinkedDeque<>(); |
| |
| /** The write publisher, responsible for writing the complete request ( both |
| * headers and body ( if any ). */ |
| private final Http1Publisher writePublisher = new Http1Publisher(); |
| |
| /** Completed when the header have been published, or there is an error */ |
| private final CompletableFuture<ExchangeImpl<T>> headersSentCF = new MinimalFuture<>(); |
| /** Completed when the body has been published, or there is an error */ |
| private final CompletableFuture<ExchangeImpl<T>> bodySentCF = new MinimalFuture<>(); |
| |
| /** The subscriber to the request's body published. Maybe null. */ |
| private volatile Http1BodySubscriber bodySubscriber; |
| |
| enum State { INITIAL, |
| HEADERS, |
| BODY, |
| ERROR, // terminal state |
| COMPLETING, |
| COMPLETED } // terminal state |
| |
| private State state = State.INITIAL; |
| |
| /** A carrier for either data or an error. Used to carry data, and communicate |
| * errors from the request ( both headers and body ) to the exchange. */ |
| static class DataPair { |
| Throwable throwable; |
| List<ByteBuffer> data; |
| DataPair(List<ByteBuffer> data, Throwable throwable){ |
| this.data = data; |
| this.throwable = throwable; |
| } |
| @Override |
| public String toString() { |
| return "DataPair [data=" + data + ", throwable=" + throwable + "]"; |
| } |
| } |
| |
| /** An abstract supertype for HTTP/1.1 body subscribers. There are two |
| * concrete implementations: {@link Http1Request.StreamSubscriber}, and |
| * {@link Http1Request.FixedContentSubscriber}, for receiving chunked and |
| * fixed length bodies, respectively. */ |
| static abstract class Http1BodySubscriber implements Flow.Subscriber<ByteBuffer> { |
| final MinimalFuture<Flow.Subscription> whenSubscribed = new MinimalFuture<>(); |
| private volatile Flow.Subscription subscription; |
| volatile boolean complete; |
| private final Logger debug; |
| Http1BodySubscriber(Logger debug) { |
| assert debug != null; |
| this.debug = debug; |
| } |
| |
| /** Final sentinel in the stream of request body. */ |
| static final List<ByteBuffer> COMPLETED = List.of(ByteBuffer.allocate(0)); |
| |
| final void request(long n) { |
| if (debug.on()) |
| debug.log("Http1BodySubscriber requesting %d, from %s", |
| n, subscription); |
| subscription.request(n); |
| } |
| |
| /** A current-state message suitable for inclusion in an exception detail message. */ |
| abstract String currentStateMessage(); |
| |
| final boolean isSubscribed() { |
| return subscription != null; |
| } |
| |
| final void setSubscription(Flow.Subscription subscription) { |
| this.subscription = subscription; |
| whenSubscribed.complete(subscription); |
| } |
| |
| final void cancelSubscription() { |
| try { |
| subscription.cancel(); |
| } catch(Throwable t) { |
| String msg = "Ignoring exception raised when canceling BodyPublisher subscription"; |
| if (debug.on()) debug.log("%s: %s", msg, t); |
| Log.logError("{0}: {1}", msg, (Object)t); |
| } |
| } |
| |
| static Http1BodySubscriber completeSubscriber(Logger debug) { |
| return new Http1BodySubscriber(debug) { |
| @Override public void onSubscribe(Flow.Subscription subscription) { error(); } |
| @Override public void onNext(ByteBuffer item) { error(); } |
| @Override public void onError(Throwable throwable) { error(); } |
| @Override public void onComplete() { error(); } |
| @Override String currentStateMessage() { return null; } |
| private void error() { |
| throw new InternalError("should not reach here"); |
| } |
| }; |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return "HTTP/1.1 " + request.toString(); |
| } |
| |
| HttpRequestImpl request() { |
| return request; |
| } |
| |
| Http1Exchange(Exchange<T> exchange, HttpConnection connection) |
| throws IOException |
| { |
| super(exchange); |
| this.request = exchange.request(); |
| this.client = exchange.client(); |
| this.executor = exchange.executor(); |
| this.operations = new LinkedList<>(); |
| operations.add(headersSentCF); |
| operations.add(bodySentCF); |
| if (connection != null) { |
| this.connection = connection; |
| } else { |
| InetSocketAddress addr = request.getAddress(); |
| this.connection = HttpConnection.getConnection(addr, client, request, HTTP_1_1); |
| } |
| this.requestAction = new Http1Request(request, this); |
| this.asyncReceiver = new Http1AsyncReceiver(executor, this); |
| } |
| |
| @Override |
| HttpConnection connection() { |
| return connection; |
| } |
| |
| private void connectFlows(HttpConnection connection) { |
| FlowTube tube = connection.getConnectionFlow(); |
| if (debug.on()) debug.log("%s connecting flows", tube); |
| |
| // Connect the flow to our Http1TubeSubscriber: |
| // asyncReceiver.subscriber(). |
| tube.connectFlows(writePublisher, |
| asyncReceiver.subscriber()); |
| } |
| |
| @Override |
| CompletableFuture<ExchangeImpl<T>> sendHeadersAsync() { |
| // create the response before sending the request headers, so that |
| // the response can set the appropriate receivers. |
| if (debug.on()) debug.log("Sending headers only"); |
| // If the first attempt to read something triggers EOF, or |
| // IOException("channel reset by peer"), we're going to retry. |
| // Instruct the asyncReceiver to throw ConnectionExpiredException |
| // to force a retry. |
| asyncReceiver.setRetryOnError(true); |
| if (response == null) { |
| response = new Http1Response<>(connection, this, asyncReceiver); |
| } |
| |
| if (debug.on()) debug.log("response created in advance"); |
| |
| CompletableFuture<Void> connectCF; |
| if (!connection.connected()) { |
| if (debug.on()) debug.log("initiating connect async"); |
| connectCF = connection.connectAsync(exchange) |
| .thenCompose(unused -> connection.finishConnect()); |
| Throwable cancelled; |
| synchronized (lock) { |
| if ((cancelled = failed) == null) { |
| operations.add(connectCF); |
| } |
| } |
| if (cancelled != null) { |
| if (client.isSelectorThread()) { |
| executor.execute(() -> |
| connectCF.completeExceptionally(cancelled)); |
| } else { |
| connectCF.completeExceptionally(cancelled); |
| } |
| } |
| } else { |
| connectCF = new MinimalFuture<>(); |
| connectCF.complete(null); |
| } |
| |
| return connectCF |
| .thenCompose(unused -> { |
| CompletableFuture<Void> cf = new MinimalFuture<>(); |
| try { |
| asyncReceiver.whenFinished.whenComplete((r,t) -> { |
| if (t != null) { |
| if (debug.on()) |
| debug.log("asyncReceiver finished (failed=%s)", (Object)t); |
| if (!headersSentCF.isDone()) |
| headersSentCF.completeAsync(() -> this, executor); |
| } |
| }); |
| connectFlows(connection); |
| |
| if (debug.on()) debug.log("requestAction.headers"); |
| List<ByteBuffer> data = requestAction.headers(); |
| synchronized (lock) { |
| state = State.HEADERS; |
| } |
| if (debug.on()) debug.log("setting outgoing with headers"); |
| assert outgoing.isEmpty() : "Unexpected outgoing:" + outgoing; |
| appendToOutgoing(data); |
| cf.complete(null); |
| return cf; |
| } catch (Throwable t) { |
| if (debug.on()) debug.log("Failed to send headers: %s", t); |
| headersSentCF.completeExceptionally(t); |
| bodySentCF.completeExceptionally(t); |
| connection.close(); |
| cf.completeExceptionally(t); |
| return cf; |
| } }) |
| .thenCompose(unused -> headersSentCF); |
| } |
| |
| private void cancelIfFailed(Flow.Subscription s) { |
| asyncReceiver.whenFinished.whenCompleteAsync((r,t) -> { |
| if (debug.on()) |
| debug.log("asyncReceiver finished (failed=%s)", (Object)t); |
| if (t != null) { |
| s.cancel(); |
| // Don't complete exceptionally here as 't' |
| // might not be the right exception: it will |
| // not have been decorated yet. |
| // t is an exception raised by the read side, |
| // an EOFException or Broken Pipe... |
| // We are cancelling the BodyPublisher subscription |
| // and completing bodySentCF to allow the next step |
| // to flow and call readHeaderAsync, which will |
| // get the right exception from the asyncReceiver. |
| bodySentCF.complete(this); |
| } |
| }, executor); |
| } |
| |
| @Override |
| CompletableFuture<ExchangeImpl<T>> sendBodyAsync() { |
| assert headersSentCF.isDone(); |
| if (debug.on()) debug.log("sendBodyAsync"); |
| try { |
| bodySubscriber = requestAction.continueRequest(); |
| if (debug.on()) debug.log("bodySubscriber is %s", |
| bodySubscriber == null ? null : bodySubscriber.getClass()); |
| if (bodySubscriber == null) { |
| bodySubscriber = Http1BodySubscriber.completeSubscriber(debug); |
| appendToOutgoing(Http1BodySubscriber.COMPLETED); |
| } else { |
| // start |
| bodySubscriber.whenSubscribed |
| .thenAccept((s) -> cancelIfFailed(s)) |
| .thenAccept((s) -> requestMoreBody()); |
| } |
| } catch (Throwable t) { |
| cancelImpl(t); |
| bodySentCF.completeExceptionally(t); |
| } |
| return Utils.wrapForDebug(debug, "sendBodyAsync", bodySentCF); |
| } |
| |
| @Override |
| CompletableFuture<Response> getResponseAsync(Executor executor) { |
| if (debug.on()) debug.log("reading headers"); |
| CompletableFuture<Response> cf = response.readHeadersAsync(executor); |
| Throwable cause; |
| synchronized (lock) { |
| operations.add(cf); |
| cause = failed; |
| failed = null; |
| } |
| |
| if (cause != null) { |
| Log.logTrace("Http1Exchange: request [{0}/timeout={1}ms]" |
| + "\n\tCompleting exceptionally with {2}\n", |
| request.uri(), |
| request.timeout().isPresent() ? |
| // calling duration.toMillis() can throw an exception. |
| // this is just debugging, we don't care if it overflows. |
| (request.timeout().get().getSeconds() * 1000 |
| + request.timeout().get().getNano() / 1000000) : -1, |
| cause); |
| boolean acknowledged = cf.completeExceptionally(cause); |
| if (debug.on()) |
| debug.log(acknowledged ? ("completed response with " + cause) |
| : ("response already completed, ignoring " + cause)); |
| } |
| return Utils.wrapForDebug(debug, "getResponseAsync", cf); |
| } |
| |
| @Override |
| CompletableFuture<T> readBodyAsync(BodyHandler<T> handler, |
| boolean returnConnectionToPool, |
| Executor executor) |
| { |
| BodySubscriber<T> bs = handler.apply(new ResponseInfoImpl(response.responseCode(), |
| response.responseHeaders(), |
| HTTP_1_1)); |
| CompletableFuture<T> bodyCF = response.readBody(bs, |
| returnConnectionToPool, |
| executor); |
| return bodyCF; |
| } |
| |
| @Override |
| CompletableFuture<Void> ignoreBody() { |
| return response.ignoreBody(executor); |
| } |
| |
| // Used for those response codes that have no body associated |
| @Override |
| public void nullBody(HttpResponse<T> resp, Throwable t) { |
| response.nullBody(resp, t); |
| } |
| |
| |
| ByteBuffer drainLeftOverBytes() { |
| synchronized (lock) { |
| asyncReceiver.stop(); |
| return asyncReceiver.drain(Utils.EMPTY_BYTEBUFFER); |
| } |
| } |
| |
| void released() { |
| Http1Response<T> resp = this.response; |
| if (resp != null) resp.completed(); |
| asyncReceiver.clear(); |
| } |
| |
| void completed() { |
| Http1Response<T> resp = this.response; |
| if (resp != null) resp.completed(); |
| } |
| |
| /** |
| * Cancel checks to see if request and responseAsync finished already. |
| * If not it closes the connection and completes all pending operations |
| */ |
| @Override |
| void cancel() { |
| cancelImpl(new IOException("Request cancelled")); |
| } |
| |
| /** |
| * Cancel checks to see if request and responseAsync finished already. |
| * If not it closes the connection and completes all pending operations |
| */ |
| @Override |
| void cancel(IOException cause) { |
| cancelImpl(cause); |
| } |
| |
| private void cancelImpl(Throwable cause) { |
| LinkedList<CompletableFuture<?>> toComplete = null; |
| int count = 0; |
| Throwable error; |
| synchronized (lock) { |
| if ((error = failed) == null) { |
| failed = error = cause; |
| } |
| if (debug.on()) { |
| debug.log(request.uri() + ": " + error); |
| } |
| if (requestAction != null && requestAction.finished() |
| && response != null && response.finished()) { |
| return; |
| } |
| writePublisher.writeScheduler.stop(); |
| if (operations.isEmpty()) { |
| Log.logTrace("Http1Exchange: request [{0}/timeout={1}ms] no pending operation." |
| + "\n\tCan''t cancel yet with {2}", |
| request.uri(), |
| request.timeout().isPresent() ? |
| // calling duration.toMillis() can throw an exception. |
| // this is just debugging, we don't care if it overflows. |
| (request.timeout().get().getSeconds() * 1000 |
| + request.timeout().get().getNano() / 1000000) : -1, |
| cause); |
| } else { |
| for (CompletableFuture<?> cf : operations) { |
| if (!cf.isDone()) { |
| if (toComplete == null) toComplete = new LinkedList<>(); |
| toComplete.add(cf); |
| count++; |
| } |
| } |
| operations.clear(); |
| } |
| } |
| try { |
| Log.logError("Http1Exchange.cancel: count=" + count); |
| if (toComplete != null) { |
| // We might be in the selector thread in case of timeout, when |
| // the SelectorManager calls purgeTimeoutsAndReturnNextDeadline() |
| // There may or may not be other places that reach here |
| // from the SelectorManager thread, so just make sure we |
| // don't complete any CF from within the selector manager |
| // thread. |
| Executor exec = client.isSelectorThread() |
| ? executor |
| : this::runInline; |
| Throwable x = error; |
| while (!toComplete.isEmpty()) { |
| CompletableFuture<?> cf = toComplete.poll(); |
| exec.execute(() -> { |
| if (cf.completeExceptionally(x)) { |
| if (debug.on()) |
| debug.log("%s: completed cf with %s", request.uri(), x); |
| } |
| }); |
| } |
| } |
| } finally { |
| connection.close(); |
| } |
| } |
| |
| private void runInline(Runnable run) { |
| assert !client.isSelectorThread(); |
| run.run(); |
| } |
| |
| /** Returns true if this exchange was canceled. */ |
| boolean isCanceled() { |
| synchronized (lock) { |
| return failed != null; |
| } |
| } |
| |
| /** Returns the cause for which this exchange was canceled, if available. */ |
| Throwable getCancelCause() { |
| synchronized (lock) { |
| return failed; |
| } |
| } |
| |
| /** Convenience for {@link #appendToOutgoing(DataPair)}, with just a Throwable. */ |
| void appendToOutgoing(Throwable throwable) { |
| appendToOutgoing(new DataPair(null, throwable)); |
| } |
| |
| /** Convenience for {@link #appendToOutgoing(DataPair)}, with just data. */ |
| void appendToOutgoing(List<ByteBuffer> item) { |
| appendToOutgoing(new DataPair(item, null)); |
| } |
| |
| private void appendToOutgoing(DataPair dp) { |
| if (debug.on()) debug.log("appending to outgoing " + dp); |
| outgoing.add(dp); |
| writePublisher.writeScheduler.runOrSchedule(); |
| } |
| |
| /** Tells whether, or not, there is any outgoing data that can be published, |
| * or if there is an error. */ |
| private boolean hasOutgoing() { |
| return !outgoing.isEmpty(); |
| } |
| |
| private void requestMoreBody() { |
| try { |
| if (debug.on()) debug.log("requesting more request body from the subscriber"); |
| bodySubscriber.request(1); |
| } catch (Throwable t) { |
| if (debug.on()) debug.log("Subscription::request failed", t); |
| cancelImpl(t); |
| bodySentCF.completeExceptionally(t); |
| } |
| } |
| |
| // Invoked only by the publisher |
| // ALL tasks should execute off the Selector-Manager thread |
| /** Returns the next portion of the HTTP request, or the error. */ |
| private DataPair getOutgoing() { |
| final Executor exec = client.theExecutor(); |
| final DataPair dp = outgoing.pollFirst(); |
| |
| if (writePublisher.cancelled) { |
| if (debug.on()) debug.log("cancelling upstream publisher"); |
| if (bodySubscriber != null) { |
| exec.execute(bodySubscriber::cancelSubscription); |
| } else if (debug.on()) { |
| debug.log("bodySubscriber is null"); |
| } |
| headersSentCF.completeAsync(() -> this, exec); |
| bodySentCF.completeAsync(() -> this, exec); |
| return null; |
| } |
| |
| if (dp == null) // publisher has not published anything yet |
| return null; |
| |
| if (dp.throwable != null) { |
| synchronized (lock) { |
| state = State.ERROR; |
| } |
| exec.execute(() -> { |
| headersSentCF.completeExceptionally(dp.throwable); |
| bodySentCF.completeExceptionally(dp.throwable); |
| connection.close(); |
| }); |
| return dp; |
| } |
| |
| switch (state) { |
| case HEADERS: |
| synchronized (lock) { |
| state = State.BODY; |
| } |
| // completeAsync, since dependent tasks should run in another thread |
| if (debug.on()) debug.log("initiating completion of headersSentCF"); |
| headersSentCF.completeAsync(() -> this, exec); |
| break; |
| case BODY: |
| if (dp.data == Http1BodySubscriber.COMPLETED) { |
| synchronized (lock) { |
| state = State.COMPLETING; |
| } |
| if (debug.on()) debug.log("initiating completion of bodySentCF"); |
| bodySentCF.completeAsync(() -> this, exec); |
| } else { |
| exec.execute(this::requestMoreBody); |
| } |
| break; |
| case INITIAL: |
| case ERROR: |
| case COMPLETING: |
| case COMPLETED: |
| default: |
| assert false : "Unexpected state:" + state; |
| } |
| |
| return dp; |
| } |
| |
| /** A Publisher of HTTP/1.1 headers and request body. */ |
| final class Http1Publisher implements FlowTube.TubePublisher { |
| |
| final Logger debug = Utils.getDebugLogger(this::dbgString); |
| volatile Flow.Subscriber<? super List<ByteBuffer>> subscriber; |
| volatile boolean cancelled; |
| final Http1WriteSubscription subscription = new Http1WriteSubscription(); |
| final Demand demand = new Demand(); |
| final SequentialScheduler writeScheduler = |
| SequentialScheduler.synchronizedScheduler(new WriteTask()); |
| |
| @Override |
| public void subscribe(Flow.Subscriber<? super List<ByteBuffer>> s) { |
| assert state == State.INITIAL; |
| Objects.requireNonNull(s); |
| assert subscriber == null; |
| |
| subscriber = s; |
| if (debug.on()) debug.log("got subscriber: %s", s); |
| s.onSubscribe(subscription); |
| } |
| |
| volatile String dbgTag; |
| String dbgString() { |
| String tag = dbgTag; |
| Object flow = connection.getConnectionFlow(); |
| if (tag == null && flow != null) { |
| dbgTag = tag = "Http1Publisher(" + flow + ")"; |
| } else if (tag == null) { |
| tag = "Http1Publisher(?)"; |
| } |
| return tag; |
| } |
| |
| final class WriteTask implements Runnable { |
| @Override |
| public void run() { |
| assert state != State.COMPLETED : "Unexpected state:" + state; |
| if (debug.on()) debug.log("WriteTask"); |
| |
| if (cancelled) { |
| if (debug.on()) debug.log("handling cancellation"); |
| writeScheduler.stop(); |
| getOutgoing(); |
| return; |
| } |
| |
| if (subscriber == null) { |
| if (debug.on()) debug.log("no subscriber yet"); |
| return; |
| } |
| if (debug.on()) debug.log(() -> "hasOutgoing = " + hasOutgoing()); |
| while (hasOutgoing() && demand.tryDecrement()) { |
| DataPair dp = getOutgoing(); |
| if (dp == null) |
| break; |
| |
| if (dp.throwable != null) { |
| if (debug.on()) debug.log("onError"); |
| // Do not call the subscriber's onError, it is not required. |
| writeScheduler.stop(); |
| } else { |
| List<ByteBuffer> data = dp.data; |
| if (data == Http1BodySubscriber.COMPLETED) { |
| synchronized (lock) { |
| assert state == State.COMPLETING : "Unexpected state:" + state; |
| state = State.COMPLETED; |
| } |
| if (debug.on()) |
| debug.log("completed, stopping %s", writeScheduler); |
| writeScheduler.stop(); |
| // Do nothing more. Just do not publish anything further. |
| // The next Subscriber will eventually take over. |
| |
| } else { |
| if (debug.on()) |
| debug.log("onNext with " + Utils.remaining(data) + " bytes"); |
| subscriber.onNext(data); |
| } |
| } |
| } |
| } |
| } |
| |
| final class Http1WriteSubscription implements Flow.Subscription { |
| |
| @Override |
| public void request(long n) { |
| if (cancelled) |
| return; //no-op |
| demand.increase(n); |
| if (debug.on()) |
| debug.log("subscription request(%d), demand=%s", n, demand); |
| writeScheduler.runOrSchedule(client.theExecutor()); |
| } |
| |
| @Override |
| public void cancel() { |
| if (debug.on()) debug.log("subscription cancelled"); |
| if (cancelled) |
| return; //no-op |
| cancelled = true; |
| writeScheduler.runOrSchedule(client.theExecutor()); |
| } |
| } |
| } |
| |
| String dbgString() { |
| return "Http1Exchange"; |
| } |
| } |