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/*
* 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.*;
class IntermediatePushStreamImpl<T> extends AbstractPushStreamImpl<T>
implements PushStream<T> {
private final AbstractPushStreamImpl< ? > previous;
IntermediatePushStreamImpl(PushStreamProvider psp,
PushStreamExecutors executors,
AbstractPushStreamImpl< ? > previous) {
super(psp, executors);
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);
}
}
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