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/*
* RED5 Open Source Media Server - https://github.com/Red5/
*
* Copyright 2006-2016 by respective authors (see below). 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.red5.server;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import javax.management.openmbean.CompositeData;
import org.red5.server.api.IAttributeStore;
import org.red5.server.api.ICastingAttributeStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class AttributeStore implements ICastingAttributeStore {
protected static Logger log = LoggerFactory.getLogger(AttributeStore.class);
/**
* Map for attributes
*/
protected ConcurrentMap attributes = new ConcurrentAttributesMap(1);
/**
* Creates empty attribute store. Object is not associated with a persistence storage.
*/
public AttributeStore() {
}
/**
* Creates attribute store with initial values. Object is not associated with a persistence storage.
*
* @param values
* map
*/
public AttributeStore(Map values) {
setAttributes(values);
}
/**
* Creates attribute store with initial values. Object is not associated with a persistence storage.
*
* @param values
* map
*/
public AttributeStore(IAttributeStore values) {
setAttributes(values);
}
/**
* Filter
*
*
* null
*
*
* keys and values from given map.
*
* @param values
* the map to filter
* @return filtered map
*/
protected Map filterNull(Map values) {
Map result = new HashMap();
for (Map.Entry entry : values.entrySet()) {
String key = entry.getKey();
if (key == null) {
continue;
}
Object value = entry.getValue();
if (value == null) {
continue;
}
result.put(key, value);
}
return result;
}
/**
* Get the attribute names. The resulting set will be read-only.
*
* @return set containing all attribute names
*/
public Set getAttributeNames() {
return Collections.unmodifiableSet(attributes.keySet());
}
/**
* Get the attributes. The resulting map will be read-only.
*
* @return map containing all attributes
*/
public Map getAttributes() {
return Collections.unmodifiableMap(attributes);
}
/**
* Return the value for a given attribute.
*
* @param name
* the name of the attribute to get
* @return the attribute value or null if the attribute doesn't exist
*/
public Object getAttribute(String name) {
if (name == null) {
return null;
}
return attributes.get(name);
}
/**
* Return the value for a given attribute and set it if it doesn't exist.
*
* @param name
* the name of the attribute to get
* @param defaultValue
* the value of the attribute to set if the attribute doesn't exist
* @return the attribute value
*/
public Object getAttribute(String name, Object defaultValue) {
if (name == null) {
return null;
}
if (defaultValue == null) {
throw new NullPointerException("the default value may not be null");
}
Object result = attributes.put(name, defaultValue);
// if no previous value result will be null
if (result == null) {
// use the default value
result = defaultValue;
}
return result;
}
/**
* Check the object has an attribute.
*
* @param name
* the name of the attribute to check
* @return true if the attribute exists otherwise false
*/
public boolean hasAttribute(String name) {
if (name == null) {
return false;
}
return attributes.containsKey(name);
}
/**
* Set an attribute on this object.
*
* @param name
* the name of the attribute to change
* @param value
* the new value of the attribute
* @return true if the attribute value was added or changed, otherwise false
*/
public boolean setAttribute(final String name, final Object value) {
boolean result = false;
if (name != null && value != null) {
// get previous value
final Object previous = attributes.get(name);
if (log.isTraceEnabled()) {
log.trace("setAttribute\nprevious: {}\nnew: {}", previous, value);
}
// update with new value
attributes.put(name, value);
// previous will be null if the attribute didn't exist and if it does it will equal the previous value
if (previous != null) {
// if the value is a collection, check the elements for modification
if (value instanceof Collection) {
Collection prevCollection = (Collection) previous;
Collection newCollection = (Collection) value;
for (Object newCollectionEntry : newCollection) {
int freq = Collections.frequency(prevCollection, newCollectionEntry);
// first element that does not exist in the previous collection will trigger the modified result
if (freq == 0) {
result = true;
break;
}
}
} else if (value instanceof Map) {
Map prevMap = (Map) previous;
Map newMap = (Map) value;
// check key differences first
if (!prevMap.keySet().containsAll(newMap.keySet())) {
result = true;
} else {
// check entries
for (Entry newMapEntry : newMap.entrySet()) {
Object prevValue = prevMap.get(newMapEntry.getKey());
if (prevValue == null) {
result = true;
break;
} else {
if (!prevValue.equals(newMapEntry.getValue())) {
result = true;
break;
}
}
}
}
} else {
// whether or not the new incoming value is "equal" to the previous value
result = !value.equals(previous);
if (log.isTraceEnabled()) {
log.trace("Equality check - modified: {} -> {} = {}", result, value, previous);
}
}
} else {
result = true;
}
}
return result;
}
/** {@inheritDoc} */
public boolean setAttributes(Map values) {
attributes.putAll(filterNull(values));
// put all doesn't return a boolean so we assume all were added
return true;
}
/** {@inheritDoc} */
public boolean setAttributes(IAttributeStore values) {
return setAttributes(values.getAttributes());
}
/**
* Remove an attribute.
*
* @param name
* the name of the attribute to remove
* @return true if the attribute was found and removed otherwise false
*/
public boolean removeAttribute(String name) {
if (name != null) {
return (attributes.remove(name) != null);
}
return false;
}
/**
* Remove all attributes.
*/
public void removeAttributes() {
attributes.clear();
}
/** {@inheritDoc} */
public int size() {
return attributes != null ? attributes.size() : 0;
}
/**
* Get Boolean attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public Boolean getBoolAttribute(String name) {
return (Boolean) getAttribute(name);
}
/**
* Get Byte attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public Byte getByteAttribute(String name) {
return (Byte) getAttribute(name);
}
/**
* Get Double attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public Double getDoubleAttribute(String name) {
return (Double) getAttribute(name);
}
/**
* Get Integer attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public Integer getIntAttribute(String name) {
return (Integer) getAttribute(name);
}
/**
* Get List attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public List getListAttribute(String name) {
return (List) getAttribute(name);
}
/**
* Get boolean attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public Long getLongAttribute(String name) {
return (Long) getAttribute(name);
}
/**
* Get Long attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public Map getMapAttribute(String name) {
return (Map) getAttribute(name);
}
/**
* Get Set attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public Set getSetAttribute(String name) {
return (Set) getAttribute(name);
}
/**
* Get Short attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public Short getShortAttribute(String name) {
return (Short) getAttribute(name);
}
/**
* Get String attribute by name
*
* @param name
* Attribute name
* @return Attribute
*/
public String getStringAttribute(String name) {
return (String) getAttribute(name);
}
/**
* Allows for reconstruction via CompositeData.
*
* @param cd
* composite data
* @return AttributeStore class instance
*/
@SuppressWarnings("unchecked")
public static AttributeStore from(CompositeData cd) {
AttributeStore instance = null;
if (cd.containsKey("attributes")) {
Object cn = cd.get("attributes");
if (cn != null) {
if (cn instanceof IAttributeStore) {
instance = new AttributeStore((IAttributeStore) cn);
} else if (cn instanceof Map) {
instance = new AttributeStore((Map) cn);
}
} else {
instance = new AttributeStore();
}
} else {
instance = new AttributeStore();
}
return instance;
}
@SuppressWarnings("serial")
private final class ConcurrentAttributesMap extends ConcurrentHashMap {
ConcurrentAttributesMap(int size) {
super(size, 0.75f, 1);
}
@Override
public V get(Object key) {
if (log.isTraceEnabled()) {
log.trace("get key: {}", key);
}
return super.get(key);
}
@Override
public V put(K key, V value) {
if (log.isTraceEnabled()) {
log.trace("put key: {} value: {}", key, value);
}
return super.put(key, value);
}
@Override
public V putIfAbsent(K key, V value) {
if (log.isTraceEnabled()) {
log.trace("putIfAbsent key: {} value: {}", key, value);
}
return super.putIfAbsent(key, value);
}
@Override
public void putAll(Map m) {
if (log.isTraceEnabled()) {
log.trace("putAll map: {}", m);
}
super.putAll(m);
}
@Override
public boolean replace(K key, V oldValue, V newValue) {
if (log.isTraceEnabled()) {
log.trace("replace key: {} old value: {} new value: {}", new Object[] { key, oldValue, newValue });
}
return super.replace(key, oldValue, newValue);
}
@Override
public V replace(K key, V value) {
if (log.isTraceEnabled()) {
log.trace("replace key: {} value: {}", key, value);
}
return super.replace(key, value);
}
}
}
