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/**
* Copyright 2014 Netflix, Inc.
*
* 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 com.netflix.config;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
public abstract class DynamicSetProperty implements Property> {
private volatile Set values;
private Set defaultValues;
private DynamicStringProperty delegate;
private Splitter splitter;
public static final String DEFAULT_DELIMITER = ",";
private final List callbackList = Lists.newArrayList();
/**
* Create the dynamic set property using default delimiter regex ",". The guava Splitter used is created as
* Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults(). The default
* set value will be transformed from set of strings after splitting. If defaultValue string is
* null, the default set value will be an empty set.
*/
public DynamicSetProperty(String propName, String defaultValue) {
this(propName, defaultValue, DEFAULT_DELIMITER);
}
/**
* Create the dynamic set property. The guava Splitter used is created as
* Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults(). The default
* set value will be transformed from set of strings after splitting. If defaultValue string is
* null, the default set value will be an empty set.
*/
public DynamicSetProperty(String propName, String defaultValue, String delimiterRegex) {
this.splitter = Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults();
setup(propName, transform(split(defaultValue)), splitter);
}
public DynamicSetProperty(String propName, Set defaultValue) {
this(propName, defaultValue, DEFAULT_DELIMITER);
}
/**
* Create the dynamic set property. The guava Splitter used is created as
* Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults(). The default
* set value will be taken from the passed in set argument.
*/
public DynamicSetProperty(String propName, Set defaultValue, String delimiterRegex) {
setup(propName, defaultValue, delimiterRegex);
}
/**
* Create the dynamic set property using the splitter and default set value passed in
* from the arguments.
*/
public DynamicSetProperty(String propName, Set defaultValue, Splitter splitter) {
setup(propName, defaultValue, splitter);
}
private void setup(String propName, Set defaultValue, String delimiterRegex) {
setup(propName, defaultValue, Splitter.onPattern(delimiterRegex).omitEmptyStrings().trimResults());
}
private void setup(String propName, Set defaultValue, Splitter splitter) {
// Make a defensive copy of the default value. Would prefer to use an ImmutableSet, but that
// does not allow for null values in the Set.
this.defaultValues = (defaultValue == null ? null :
Collections.unmodifiableSet(new LinkedHashSet(defaultValue)));
this.splitter = splitter;
delegate = DynamicPropertyFactory.getInstance().getStringProperty(propName, null);
load();
Runnable callback = new Runnable() {
@Override
public void run() {
propertyChangedInternal();
}
};
delegate.addCallback(callback);
callbackList.add(callback);
}
private void propertyChangedInternal() {
load();
propertyChanged();
}
/**
* A method invoked when the underlying string property is changed. Default implementation does nothing.
* Subclass can override this method
* to receive callback.
*/
protected void propertyChanged() {
}
/**
* Get the set type from the underlying dynamic string property. If the property is undefined, this method
* returns the default set value.
*/
public Set get() {
return values;
}
@Override
public Set getValue() {
return get();
}
@Override
public Set getDefaultValue() {
return defaultValues;
}
private Set split(String value) {
return Sets.newLinkedHashSet(splitter.split(Strings.nullToEmpty(value)));
}
protected Set transform(Set stringValues) {
Set set = new LinkedHashSet(stringValues.size());
for (String s : stringValues) {
set.add(from(s));
}
return Collections.unmodifiableSet(set);
}
protected void load() {
if (delegate.get() == null) {
values = defaultValues;
} else {
values = transform(split(delegate.get()));
}
}
/**
* Gets the time (in milliseconds past the epoch) when the property
* was last set/changed.
*/
@Override
public long getChangedTimestamp() {
return delegate.getChangedTimestamp();
}
/**
* Add the callback to be triggered when the value of the property is changed
*
*/
@Override
public void addCallback(Runnable callback) {
if (callback != null) {
delegate.addCallback(callback);
callbackList.add(callback);
}
}
/**
* Remove all callbacks registered through this instance of property
*/
@Override
public void removeAllCallbacks() {
for (Runnable callback: callbackList) {
delegate.prop.removeCallback(callback);
}
}
/**
* Construct the generic type from string.
*
*/
protected abstract T from(String value);
/**
* Getter for the property name
*/
@Override
public String getName(){
return delegate.getName();
}
}
