author | chegar |
Fri, 05 Jan 2018 14:11:48 +0000 | |
branch | http-client-branch |
changeset 56008 | bbd688c6fbbb |
parent 55993 | 087a6b6d4955 |
parent 48376 | 41ae5c69b09c |
child 56035 | 2f3f5da13c4c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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package jdk.incubator.http; |
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|
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import java.io.IOException; |
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import java.lang.System.Logger.Level; |
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import java.util.concurrent.CompletableFuture; |
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import java.util.concurrent.Executor; |
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import java.util.function.Function; |
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import jdk.incubator.http.internal.common.MinimalFuture; |
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import static jdk.incubator.http.HttpClient.Version.HTTP_1_1; |
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import jdk.incubator.http.internal.common.Utils; |
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|
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/** |
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* Splits request so that headers and body can be sent separately with optional |
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* (multiple) responses in between (e.g. 100 Continue). Also request and |
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* response always sent/received in different calls. |
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* |
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* Synchronous and asynchronous versions of each method are provided. |
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* |
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* Separate implementations of this class exist for HTTP/1.1 and HTTP/2 |
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* Http1Exchange (HTTP/1.1) |
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* Stream (HTTP/2) |
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* |
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* These implementation classes are where work is allocated to threads. |
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*/ |
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abstract class ExchangeImpl<T> { |
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static final boolean DEBUG = Utils.DEBUG; // Revisit: temporary dev flag. |
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private static final System.Logger DEBUG_LOGGER = |
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Utils.getDebugLogger("ExchangeImpl"::toString, DEBUG); |
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final Exchange<T> exchange; |
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ExchangeImpl(Exchange<T> e) { |
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// e == null means a http/2 pushed stream |
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this.exchange = e; |
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} |
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final Exchange<T> getExchange() { |
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return exchange; |
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} |
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/** |
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* Returns the {@link HttpConnection} instance to which this exchange is |
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* assigned. |
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*/ |
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abstract HttpConnection connection(); |
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/** |
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* Initiates a new exchange and assigns it to a connection if one exists |
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* already. connection usually null. |
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*/ |
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static <U> CompletableFuture<? extends ExchangeImpl<U>> |
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get(Exchange<U> exchange, HttpConnection connection) |
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{ |
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if (exchange.version() == HTTP_1_1) { |
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DEBUG_LOGGER.log(Level.DEBUG, "get: HTTP/1.1: new Http1Exchange"); |
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return createHttp1Exchange(exchange, connection); |
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} else { |
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Http2ClientImpl c2 = exchange.client().client2(); // TODO: improve |
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HttpRequestImpl request = exchange.request(); |
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CompletableFuture<Http2Connection> c2f = c2.getConnectionFor(request); |
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DEBUG_LOGGER.log(Level.DEBUG, "get: Trying to get HTTP/2 connection"); |
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return c2f.handle((h2c, t) -> createExchangeImpl(h2c, t, exchange, connection)) |
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.thenCompose(Function.identity()); |
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} |
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} |
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private static <U> CompletableFuture<? extends ExchangeImpl<U>> |
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createExchangeImpl(Http2Connection c, |
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Throwable t, |
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Exchange<U> exchange, |
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HttpConnection connection) |
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{ |
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DEBUG_LOGGER.log(Level.DEBUG, "handling HTTP/2 connection creation result"); |
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boolean secure = exchange.request().secure(); |
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if (t != null) { |
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DEBUG_LOGGER.log(Level.DEBUG, |
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"handling HTTP/2 connection creation failed: %s", |
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(Object)t); |
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t = Utils.getCompletionCause(t); |
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if (t instanceof Http2Connection.ALPNException) { |
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Http2Connection.ALPNException ee = (Http2Connection.ALPNException)t; |
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AbstractAsyncSSLConnection as = ee.getConnection(); |
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DEBUG_LOGGER.log(Level.DEBUG, "downgrading to HTTP/1.1 with: %s", as); |
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CompletableFuture<? extends ExchangeImpl<U>> ex = |
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createHttp1Exchange(exchange, as); |
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return ex; |
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} else { |
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DEBUG_LOGGER.log(Level.DEBUG, "HTTP/2 connection creation failed " |
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+ "with unexpected exception: %s", (Object)t); |
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return CompletableFuture.failedFuture(t); |
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} |
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} |
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if (secure && c== null) { |
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DEBUG_LOGGER.log(Level.DEBUG, "downgrading to HTTP/1.1 "); |
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CompletableFuture<? extends ExchangeImpl<U>> ex = |
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createHttp1Exchange(exchange, null); |
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return ex; |
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} |
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if (c == null) { |
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// no existing connection. Send request with HTTP 1 and then |
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// upgrade if successful |
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DEBUG_LOGGER.log(Level.DEBUG, "new Http1Exchange, try to upgrade"); |
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return createHttp1Exchange(exchange, connection) |
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.thenApply((e) -> { |
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exchange.h2Upgrade(); |
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return e; |
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}); |
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} else { |
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DEBUG_LOGGER.log(Level.DEBUG, "creating HTTP/2 streams"); |
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Stream<U> s = c.createStream(exchange); |
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CompletableFuture<? extends ExchangeImpl<U>> ex = MinimalFuture.completedFuture(s); |
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return ex; |
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} |
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} |
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private static <T> CompletableFuture<Http1Exchange<T>> |
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createHttp1Exchange(Exchange<T> ex, HttpConnection as) |
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{ |
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try { |
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return MinimalFuture.completedFuture(new Http1Exchange<>(ex, as)); |
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} catch (Throwable e) { |
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return MinimalFuture.failedFuture(e); |
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} |
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} |
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/* The following methods have separate HTTP/1.1 and HTTP/2 implementations */ |
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abstract CompletableFuture<ExchangeImpl<T>> sendHeadersAsync(); |
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/** Sends a request body, after request headers have been sent. */ |
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abstract CompletableFuture<ExchangeImpl<T>> sendBodyAsync(); |
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abstract CompletableFuture<T> readBodyAsync(HttpResponse.BodyHandler<T> handler, |
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boolean returnConnectionToPool, |
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Executor executor); |
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/** |
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* Ignore/consume the body. |
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*/ |
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abstract CompletableFuture<Void> ignoreBody(); |
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/** Gets the response headers. Completes before body is read. */ |
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abstract CompletableFuture<Response> getResponseAsync(Executor executor); |
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/** Cancels a request. Not currently exposed through API. */ |
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abstract void cancel(); |
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/** |
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* Cancels a request with a cause. Not currently exposed through API. |
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*/ |
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abstract void cancel(IOException cause); |
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/** |
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* Called when the exchange is released, so that cleanup actions may be |
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* performed - such as deregistering callbacks. |
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* Typically released is called during upgrade, when an HTTP/2 stream |
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* takes over from an Http1Exchange, or when a new exchange is created |
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* during a multi exchange before the final response body was received. |
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*/ |
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abstract void released(); |
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||
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/** |
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* Called when the exchange is completed, so that cleanup actions may be |
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* performed - such as deregistering callbacks. |
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* Typically, completed is called at the end of the exchange, when the |
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* final response body has been received (or an error has caused the |
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* completion of the exchange). |
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*/ |
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abstract void completed(); |
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/** |
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* Returns true if this exchange was canceled. |
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* @return true if this exchange was canceled. |
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*/ |
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abstract boolean isCanceled(); |
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||
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/** |
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* Returns the cause for which this exchange was canceled, if available. |
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* @return the cause for which this exchange was canceled, if available. |
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*/ |
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abstract Throwable getCancelCause(); |
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} |