| /* |
| * Copyright (c) 2016, 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; |
| |
| import java.util.concurrent.CompletableFuture; |
| import jdk.incubator.http.internal.common.MinimalFuture; |
| import jdk.incubator.http.internal.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<U,T> { |
| // the overall completion object, completed when all pushes are done. |
| final CompletableFuture<Void> resultCF; |
| final CompletableFuture<Void> noMorePushesCF; |
| |
| volatile Throwable error; // any exception that occured during pushes |
| |
| // CF for main response |
| final CompletableFuture<HttpResponse<T>> mainResponse; |
| |
| // user's processor object |
| final HttpResponse.MultiProcessor<U, T> multiProcessor; |
| |
| final HttpResponse.BodyHandler<T> mainBodyHandler; |
| |
| int numberOfPushes; |
| int remainingPushes; |
| boolean noMorePushes = false; |
| |
| PushGroup(HttpResponse.MultiProcessor<U, T> multiProcessor, HttpRequestImpl req) { |
| this(multiProcessor, req, new MinimalFuture<>()); |
| } |
| |
| // Check mainBodyHandler before calling nested constructor. |
| private PushGroup(HttpResponse.MultiProcessor<U, T> multiProcessor, |
| HttpRequestImpl req, |
| CompletableFuture<HttpResponse<T>> mainResponse) { |
| this(multiProcessor, mainResponse, |
| multiProcessor.onRequest(req).orElseThrow( |
| () -> new IllegalArgumentException( |
| "A valid body processor for the main response is required"))); |
| } |
| |
| // This private constructor is called after all parameters have been |
| // checked. |
| private PushGroup(HttpResponse.MultiProcessor<U, T> multiProcessor, |
| CompletableFuture<HttpResponse<T>> mainResponse, |
| HttpResponse.BodyHandler<T> mainBodyHandler) { |
| |
| assert mainResponse != null; // A new instance is created above |
| assert mainBodyHandler != null; // should have been checked above |
| |
| this.resultCF = new MinimalFuture<>(); |
| this.noMorePushesCF = new MinimalFuture<>(); |
| this.multiProcessor = multiProcessor; |
| this.mainResponse = mainResponse.thenApply(r -> { |
| multiProcessor.onResponse(r); |
| return r; |
| }); |
| this.mainBodyHandler = mainBodyHandler; |
| } |
| |
| CompletableFuture<Void> groupResult() { |
| return resultCF; |
| } |
| |
| HttpResponse.MultiProcessor<U, T> processor() { |
| return multiProcessor; |
| } |
| |
| HttpResponse.BodyHandler<T> mainResponseHandler() { |
| return mainBodyHandler; |
| } |
| |
| synchronized void setMainResponse(CompletableFuture<HttpResponse<T>> r) { |
| r.whenComplete((HttpResponse<T> response, Throwable t) -> { |
| if (t != null) |
| mainResponse.completeExceptionally(t); |
| else |
| mainResponse.complete(response); |
| }); |
| } |
| |
| synchronized CompletableFuture<HttpResponse<T>> mainResponse() { |
| return mainResponse; |
| } |
| |
| synchronized void addPush() { |
| numberOfPushes++; |
| remainingPushes++; |
| } |
| |
| synchronized int numberOfPushes() { |
| return numberOfPushes; |
| } |
| // 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); |
| } |
| |
| 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"); |
| } |
| resultCF.complete(null); |
| } |
| } |
| |
| synchronized void pushError(Throwable t) { |
| if (t == null) { |
| return; |
| } |
| this.error = t; |
| resultCF.completeExceptionally(t); |
| } |
| } |