| /* |
| * Copyright (c) OSGi Alliance (2015, 2017). All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.osgi.util.pushstream; |
| |
| import static org.osgi.util.pushstream.AbstractPushStreamImpl.State.*; |
| |
| import org.osgi.util.promise.PromiseFactory; |
| |
| class IntermediatePushStreamImpl<T> extends AbstractPushStreamImpl<T> |
| implements PushStream<T> { |
| |
| private final AbstractPushStreamImpl< ? > previous; |
| |
| IntermediatePushStreamImpl(PushStreamProvider psp, |
| PromiseFactory promiseFactory, |
| AbstractPushStreamImpl< ? > previous) { |
| super(psp, promiseFactory); |
| this.previous = previous; |
| } |
| |
| @Override |
| protected boolean begin() { |
| if(closed.compareAndSet(BUILDING, STARTED)) { |
| beginning(); |
| previous.begin(); |
| return true; |
| } |
| return false; |
| } |
| |
| protected void beginning() { |
| // The base implementation has nothing to do, but |
| // this method is used in windowing |
| } |
| |
| @Override |
| protected void upstreamClose(PushEvent< ? > close) { |
| if (closed.get() != CLOSED) { |
| close(close.nodata(), false); |
| } |
| previous.upstreamClose(close); |
| } |
| |
| } |