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AbstractStream.java
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140 lines (106 loc) · 3.94 KB
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.coyote.http2;
import java.util.HashSet;
import java.util.Set;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
/**
* Used to managed prioritisation.
*/
abstract class AbstractStream {
private static final Log log = LogFactory.getLog(AbstractStream.class);
private static final StringManager sm = StringManager.getManager(AbstractStream.class);
private final Integer identifier;
private volatile AbstractStream parentStream = null;
private final Set<AbstractStream> childStreams = new HashSet<>();
private long windowSize = ConnectionSettings.DEFAULT_WINDOW_SIZE;
public Integer getIdentifier() {
return identifier;
}
public AbstractStream(Integer identifier) {
this.identifier = identifier;
}
void detachFromParent() {
if (parentStream != null) {
parentStream.getChildStreams().remove(this);
parentStream = null;
}
}
void addChild(AbstractStream child) {
child.setParent(this);
childStreams.add(child);
}
private void setParent(AbstractStream parent) {
this.parentStream = parent;
}
boolean isDescendant(AbstractStream stream) {
if (childStreams.contains(stream)) {
return true;
}
for (AbstractStream child : childStreams) {
if (child.isDescendant(stream)) {
return true;
}
}
return false;
}
AbstractStream getParentStream() {
return parentStream;
}
void setParentStream(AbstractStream parentStream) {
this.parentStream = parentStream;
}
Set<AbstractStream> getChildStreams() {
return childStreams;
}
protected synchronized void setWindowSize(long windowSize) {
this.windowSize = windowSize;
}
protected synchronized long getWindowSize() {
return windowSize;
}
/**
* @param increment
* @throws Http2Exception
*/
protected synchronized void incrementWindowSize(int increment) throws Http2Exception {
// Overflow protection
if (Long.MAX_VALUE - increment < windowSize) {
windowSize = Long.MAX_VALUE;
} else {
windowSize += increment;
}
if (log.isDebugEnabled()) {
log.debug(sm.getString("abstractStream.windowSizeInc", getConnectionId(),
getIdentifier(), Integer.toString(increment), Long.toString(windowSize)));
}
}
protected synchronized void decrementWindowSize(int decrement) {
// No need for overflow protection here. Decrement can never be larger
// the Integer.MAX_VALUE and once windowSize goes negative no further
// decrements are permitted
windowSize -= decrement;
if (log.isDebugEnabled()) {
log.debug(sm.getString("abstractStream.windowSizeDec", getConnectionId(),
getIdentifier(), Integer.toString(decrement), Long.toString(windowSize)));
}
}
protected abstract String getConnectionId();
protected abstract int getWeight();
}