src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/MultiExchange.java
author chegar
Sun, 05 Nov 2017 21:19:55 +0000
branchhttp-client-branch
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permissions -rw-r--r--
http-client-branch: WebSocket permission checks, test updates, and more
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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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package jdk.incubator.http;
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import java.io.IOException;
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import java.lang.System.Logger.Level;
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import java.time.Duration;
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import java.util.List;
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import java.security.AccessControlContext;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.CompletionException;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.Executor;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.function.UnaryOperator;
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import jdk.incubator.http.HttpResponse.UntrustedBodyHandler;
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import jdk.incubator.http.internal.common.Log;
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import jdk.incubator.http.internal.common.MinimalFuture;
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import jdk.incubator.http.internal.common.ConnectionExpiredException;
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import jdk.incubator.http.internal.common.Utils;
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import static jdk.incubator.http.internal.common.MinimalFuture.completedFuture;
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import static jdk.incubator.http.internal.common.MinimalFuture.failedFuture;
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/**
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 * Encapsulates multiple Exchanges belonging to one HttpRequestImpl.
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 * - manages filters
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 * - retries due to filters.
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 * - I/O errors and most other exceptions get returned directly to user
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 *
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 * Creates a new Exchange for each request/response interaction
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 */
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class MultiExchange<U,T> {
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    static final boolean DEBUG = Utils.DEBUG; // Revisit: temporary dev flag.
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    static final System.Logger DEBUG_LOGGER =
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            Utils.getDebugLogger("MultiExchange"::toString, DEBUG);
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    private final HttpRequest userRequest; // the user request
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    private final HttpRequestImpl request; // a copy of the user request
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    final AccessControlContext acc;
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    final HttpClientImpl client;
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    final HttpResponse.BodyHandler<T> responseHandler;
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    final Executor executor;
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    final HttpResponse.MultiSubscriber<U,T> multiResponseSubscriber;
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    final AtomicInteger attempts = new AtomicInteger();
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    HttpRequestImpl currentreq; // used for async only
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    Exchange<T> exchange; // the current exchange
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    Exchange<T> previous;
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    volatile Throwable retryCause;
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    volatile boolean expiredOnce;
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    // Maximum number of times a request will be retried/redirected
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    // for any reason
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    static final int DEFAULT_MAX_ATTEMPTS = 5;
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    static final int max_attempts = Utils.getIntegerNetProperty(
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            "jdk.httpclient.redirects.retrylimit", DEFAULT_MAX_ATTEMPTS
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    );
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    private final List<HeaderFilter> filters;
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    TimedEvent timedEvent;
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    volatile boolean cancelled;
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    final PushGroup<U,T> pushGroup;
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    /**
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     * Filter fields. These are attached as required by filters
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     * and only used by the filter implementations. This could be
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     * generalised into Objects that are passed explicitly to the filters
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     * (one per MultiExchange object, and one per Exchange object possibly)
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     */
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    volatile AuthenticationFilter.AuthInfo serverauth, proxyauth;
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    // RedirectHandler
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    volatile int numberOfRedirects = 0;
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    /**
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     * MultiExchange with one final response.
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     */
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    MultiExchange(HttpRequest userRequest,
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                  HttpRequestImpl requestImpl,
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                  HttpClientImpl client,
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                  HttpResponse.BodyHandler<T> responseHandler,
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                  AccessControlContext acc) {
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        this.previous = null;
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        this.userRequest = userRequest;
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        this.request = requestImpl;
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        this.currentreq = request;
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        this.client = client;
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        this.filters = client.filterChain();
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        this.acc = acc;
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        this.executor = client.theExecutor();
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        this.responseHandler = responseHandler;
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        if (acc != null) {
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            // Restricts the file publisher with the senders ACC, if any
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            if (responseHandler instanceof UntrustedBodyHandler)
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                ((UntrustedBodyHandler)this.responseHandler).setAccessControlContext(acc);
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        }
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        this.exchange = new Exchange<>(request, this);
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        this.multiResponseSubscriber = null;
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        this.pushGroup = null;
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    }
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    /**
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     * MultiExchange with multiple responses (HTTP/2 server pushes).
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     */
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    MultiExchange(HttpRequest userRequest,
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                  HttpRequestImpl requestImpl,
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                  HttpClientImpl client,
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                  HttpResponse.MultiSubscriber<U, T> multiResponseSubscriber,
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                  AccessControlContext acc) {
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        this.previous = null;
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        this.userRequest = userRequest;
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        this.request = requestImpl;
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        this.currentreq = request;
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        this.client = client;
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        this.filters = client.filterChain();
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        this.acc = acc;
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        this.executor = client.theExecutor();
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        this.multiResponseSubscriber = multiResponseSubscriber;
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        this.pushGroup = new PushGroup<>(multiResponseSubscriber, request, acc);
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        this.exchange = new Exchange<>(request, this);
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        this.responseHandler = pushGroup.mainResponseHandler();
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    }
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    CompletableFuture<Void> multiCompletionCF() {
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        return pushGroup.groupResult();
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    }
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    private synchronized Exchange<T> getExchange() {
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        return exchange;
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    }
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    HttpClientImpl client() {
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        return client;
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    }
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    HttpClient.Redirect followRedirects() {
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        return client.followRedirects();
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    }
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    HttpClient.Version version() {
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        return request.version().orElse(client.version());
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    }
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    private synchronized void setExchange(Exchange<T> exchange) {
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        if (this.exchange != null && exchange != this.exchange) {
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            this.exchange.released();
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        }
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        this.exchange = exchange;
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    }
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    private void cancelTimer() {
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        if (timedEvent != null) {
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            client.cancelTimer(timedEvent);
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        }
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    }
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    private void requestFilters(HttpRequestImpl r) throws IOException {
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        Log.logTrace("Applying request filters");
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        for (HeaderFilter filter : filters) {
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            Log.logTrace("Applying {0}", filter);
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            filter.request(r, this);
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        }
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        Log.logTrace("All filters applied");
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    }
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    private HttpRequestImpl responseFilters(Response response) throws IOException
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    {
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        Log.logTrace("Applying response filters");
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        for (HeaderFilter filter : filters) {
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            Log.logTrace("Applying {0}", filter);
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            HttpRequestImpl newreq = filter.response(response);
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            if (newreq != null) {
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                Log.logTrace("New request: stopping filters");
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                return newreq;
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            }
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        }
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        Log.logTrace("All filters applied");
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        return null;
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    }
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    public void cancel() {
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        cancelled = true;
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        getExchange().cancel();
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    }
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    public void cancel(IOException cause) {
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        cancelled = true;
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        getExchange().cancel(cause);
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    }
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    public CompletableFuture<HttpResponse<T>> responseAsync() {
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        CompletableFuture<Void> start = new MinimalFuture<>();
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        CompletableFuture<HttpResponse<T>> cf = responseAsync0(start);
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        start.completeAsync( () -> null, executor); // trigger execution
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        return cf;
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    }
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    private CompletableFuture<HttpResponse<T>>
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    responseAsync0(CompletableFuture<Void> start) {
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        return start.thenCompose( v -> responseAsyncImpl())
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                    .thenCompose((Response r) -> {
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                        Exchange<T> exch = getExchange();
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                        return exch.readBodyAsync(responseHandler)
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                                   .thenApply((T body) ->
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                                           new HttpResponseImpl<>(userRequest,
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                                                                  r,
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                                                                  body,
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                                                                  exch));
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                    });
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    }
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    CompletableFuture<U> multiResponseAsync() {
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        CompletableFuture<Void> start = new MinimalFuture<>();
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        CompletableFuture<HttpResponse<T>> cf = responseAsync0(start);
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        CompletableFuture<HttpResponse<T>> mainResponse =
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                cf.thenApply(b -> {
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                        multiResponseSubscriber.onResponse(b);
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                        pushGroup.noMorePushes(true);
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                        return b; });
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        pushGroup.setMainResponse(mainResponse);
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        CompletableFuture<U> res = multiResponseSubscriber.completion(pushGroup.groupResult(),
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                                                                      pushGroup.pushesCF());
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        start.completeAsync( () -> null, executor); // trigger execution
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        return res;
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    }
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    private CompletableFuture<Response> responseAsyncImpl() {
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        CompletableFuture<Response> cf;
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        if (attempts.incrementAndGet() > max_attempts) {
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            cf = failedFuture(new IOException("Too many retries", retryCause));
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        } else {
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            if (currentreq.timeout().isPresent()) {
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                timedEvent = new TimedEvent(currentreq.timeout().get());
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                client.registerTimer(timedEvent);
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            }
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            try {
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                // 1. apply request filters
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                requestFilters(currentreq);
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            } catch (IOException e) {
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                return failedFuture(e);
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            }
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            Exchange<T> exch = getExchange();
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            // 2. get response
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            cf = exch.responseAsync()
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                     .thenCompose((Response response) -> {
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                        HttpRequestImpl newrequest;
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                        try {
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                            // 3. apply response filters
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                            newrequest = responseFilters(response);
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                        } catch (IOException e) {
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                            return failedFuture(e);
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                        }
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                        // 4. check filter result and repeat or continue
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                        if (newrequest == null) {
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                            if (attempts.get() > 1) {
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                                Log.logError("Succeeded on attempt: " + attempts);
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                            }
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                            return completedFuture(response);
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                        } else {
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                            currentreq = newrequest;
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                            expiredOnce = false;
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                            setExchange(new Exchange<>(currentreq, this, acc));
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                            //reads body off previous, and then waits for next response
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                            return responseAsyncImpl();
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                        } })
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                     .handle((response, ex) -> {
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                        // 5. handle errors and cancel any timer set
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                        cancelTimer();
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                        if (ex == null) {
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                            assert response != null;
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                            return completedFuture(response);
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                        }
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                        // all exceptions thrown are handled here
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                        CompletableFuture<Response> errorCF = getExceptionalCF(ex);
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                        if (errorCF == null) {
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                            return responseAsyncImpl();
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                        } else {
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                            return errorCF;
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                        } })
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                     .thenCompose(UnaryOperator.identity());
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        }
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        return cf;
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    }
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    /**
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     * Takes a Throwable and returns a suitable CompletableFuture that is
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     * completed exceptionally, or null.
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     */
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    private CompletableFuture<Response> getExceptionalCF(Throwable t) {
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        if ((t instanceof CompletionException) || (t instanceof ExecutionException)) {
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            if (t.getCause() != null) {
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                t = t.getCause();
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            }
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        }
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        if (cancelled && t instanceof IOException) {
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            t = new HttpTimeoutException("request timed out");
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        } else if (t instanceof ConnectionExpiredException) {
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            // allow the retry mechanism to do its work
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            // ####: method (GET,HEAD, not POST?), no bytes written or read ( differentiate? )
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            if (t.getCause() != null) retryCause = t.getCause();
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            if (!expiredOnce) {
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                DEBUG_LOGGER.log(Level.DEBUG,
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                    "MultiExchange: ConnectionExpiredException (async): retrying...",
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                    t);
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                expiredOnce = true;
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                return null;
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            } else {
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                DEBUG_LOGGER.log(Level.DEBUG,
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                    "MultiExchange: ConnectionExpiredException (async): already retried once.",
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                    t);
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                if (t.getCause() != null) t = t.getCause();
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            }
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        }
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        return failedFuture(t);
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    }
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    class TimedEvent extends TimeoutEvent {
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        TimedEvent(Duration duration) {
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            super(duration);
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        }
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        @Override
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        public void handle() {
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            DEBUG_LOGGER.log(Level.DEBUG,
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                    "Cancelling MultiExchange due to timeout for request %s",
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                     request);
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            cancel(new HttpTimeoutException("request timed out"));
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        }
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    }
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}