org.apache.jackrabbit.oak.segment.TemplateCache Maven / Gradle / Ivy
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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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.jackrabbit.oak.segment;
import static org.apache.jackrabbit.oak.api.Type.STRING;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.commons.StringUtils;
public class TemplateCache extends ReaderCache {
/**
* Create a new template cache.
*
* @param maxSize the maximum memory in bytes.
*/
TemplateCache(long maxSize) {
super(maxSize, 250, "Template Cache");
}
@Override
protected int getEntryWeight(Template template) {
int size = 168; // overhead for each cache entry
size += 40; // key
size += estimateMemoryUsage(template.getPrimaryType());
size += estimateMemoryUsage(template.getMixinTypes());
size += estimateMemoryUsage(template.getChildName());
for (PropertyTemplate property : template.getPropertyTemplates()) {
size += estimateMemoryUsage(property);
}
return size;
}
private static int estimateMemoryUsage(PropertyTemplate propertyTemplate) {
return 4 + // index
estimateMemoryUsage(propertyTemplate.getName());
}
private static int estimateMemoryUsage(PropertyState propertyState) {
if (propertyState == null) {
return 0;
}
int size = estimateMemoryUsage(propertyState.getName());
for (int k = 0; k < propertyState.count(); k++) {
size += estimateMemoryUsage(propertyState.getValue(STRING, k));
}
return size;
}
private static int estimateMemoryUsage(String string) {
if (string == null) {
return 0;
}
return StringUtils.estimateMemoryUsage(string);
}
@Override
protected boolean isSmall(Template template) {
PropertyTemplate[] properties = template.getPropertyTemplates();
PropertyState mixins = template.getMixinTypes();
return properties.length == 0 && (mixins == null || mixins.count() == 0);
}
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