| /* |
| * Copyright (c) 2016, 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.internal.net.http; |
| |
| import java.security.AccessControlContext; |
| import java.util.Objects; |
| import java.util.concurrent.CompletableFuture; |
| import java.net.http.HttpRequest; |
| import java.net.http.HttpResponse; |
| import java.net.http.HttpResponse.BodyHandler; |
| import java.net.http.HttpResponse.PushPromiseHandler; |
| import java.util.concurrent.Executor; |
| |
| import jdk.internal.net.http.common.MinimalFuture; |
| import jdk.internal.net.http.common.Log; |
| |
| /** |
| * One PushGroup object is associated with the parent Stream of the pushed |
| * Streams. This keeps track of all common state associated with the pushes. |
| */ |
| class PushGroup<T> { |
| private final HttpRequest initiatingRequest; |
| |
| final CompletableFuture<Void> noMorePushesCF; |
| |
| volatile Throwable error; // any exception that occurred during pushes |
| |
| // user's subscriber object |
| final PushPromiseHandler<T> pushPromiseHandler; |
| |
| private final Executor executor; |
| |
| int numberOfPushes; |
| int remainingPushes; |
| boolean noMorePushes = false; |
| |
| PushGroup(PushPromiseHandler<T> pushPromiseHandler, |
| HttpRequestImpl initiatingRequest, |
| Executor executor) { |
| this(pushPromiseHandler, initiatingRequest, new MinimalFuture<>(), executor); |
| } |
| |
| // Check mainBodyHandler before calling nested constructor. |
| private PushGroup(HttpResponse.PushPromiseHandler<T> pushPromiseHandler, |
| HttpRequestImpl initiatingRequest, |
| CompletableFuture<HttpResponse<T>> mainResponse, |
| Executor executor) { |
| this.noMorePushesCF = new MinimalFuture<>(); |
| this.pushPromiseHandler = pushPromiseHandler; |
| this.initiatingRequest = initiatingRequest; |
| this.executor = executor; |
| } |
| |
| interface Acceptor<T> { |
| BodyHandler<T> bodyHandler(); |
| CompletableFuture<HttpResponse<T>> cf(); |
| boolean accepted(); |
| } |
| |
| private static class AcceptorImpl<T> implements Acceptor<T> { |
| private final Executor executor; |
| private volatile HttpResponse.BodyHandler<T> bodyHandler; |
| private volatile CompletableFuture<HttpResponse<T>> cf; |
| |
| AcceptorImpl(Executor executor) { |
| this.executor = executor; |
| } |
| |
| CompletableFuture<HttpResponse<T>> accept(BodyHandler<T> bodyHandler) { |
| Objects.requireNonNull(bodyHandler); |
| if (this.bodyHandler != null) |
| throw new IllegalStateException("non-null bodyHandler"); |
| this.bodyHandler = bodyHandler; |
| cf = new MinimalFuture<>(); |
| return cf.whenCompleteAsync((r,t) -> {}, executor); |
| } |
| |
| @Override public BodyHandler<T> bodyHandler() { return bodyHandler; } |
| |
| @Override public CompletableFuture<HttpResponse<T>> cf() { return cf; } |
| |
| @Override public boolean accepted() { return cf != null; } |
| } |
| |
| Acceptor<T> acceptPushRequest(HttpRequest pushRequest) { |
| AcceptorImpl<T> acceptor = new AcceptorImpl<>(executor); |
| try { |
| pushPromiseHandler.applyPushPromise(initiatingRequest, pushRequest, acceptor::accept); |
| } catch (Throwable t) { |
| if (acceptor.accepted()) { |
| CompletableFuture<?> cf = acceptor.cf(); |
| cf.completeExceptionally(t); |
| } |
| throw t; |
| } |
| |
| synchronized (this) { |
| if (acceptor.accepted()) { |
| numberOfPushes++; |
| remainingPushes++; |
| } |
| return acceptor; |
| } |
| } |
| |
| // This is called when the main body response completes because it means |
| // no more PUSH_PROMISEs are possible |
| |
| synchronized void noMorePushes(boolean noMore) { |
| noMorePushes = noMore; |
| checkIfCompleted(); |
| noMorePushesCF.complete(null); |
| } |
| |
| synchronized CompletableFuture<Void> pushesCF() { |
| return noMorePushesCF; |
| } |
| |
| synchronized boolean noMorePushes() { |
| return noMorePushes; |
| } |
| |
| synchronized void pushCompleted() { |
| remainingPushes--; |
| checkIfCompleted(); |
| } |
| |
| synchronized void checkIfCompleted() { |
| if (Log.trace()) { |
| Log.logTrace("PushGroup remainingPushes={0} error={1} noMorePushes={2}", |
| remainingPushes, |
| (error==null)?error:error.getClass().getSimpleName(), |
| noMorePushes); |
| } |
| if (remainingPushes == 0 && error == null && noMorePushes) { |
| if (Log.trace()) { |
| Log.logTrace("push completed"); |
| } |
| } |
| } |
| |
| synchronized void pushError(Throwable t) { |
| if (t == null) { |
| return; |
| } |
| this.error = t; |
| } |
| } |