| /* |
| * 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.servicecomb.config.priority; |
| |
| import java.lang.reflect.Type; |
| import java.util.Arrays; |
| import java.util.Objects; |
| import java.util.function.Function; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.netflix.config.DynamicProperty; |
| |
| /** |
| * must create by PriorityPropertyManager<br> |
| * or register to PriorityPropertyManager manually |
| * @param <T> |
| */ |
| public class PriorityProperty<T> { |
| private static final Logger LOGGER = LoggerFactory.getLogger(PriorityProperty.class); |
| |
| private final PriorityPropertyType<T> propertyType; |
| |
| private final String joinedPriorityKeys; |
| |
| private final Function<DynamicProperty, T> internalValueReader; |
| |
| private final DynamicProperty[] properties; |
| |
| private T finalValue; |
| |
| public PriorityProperty(PriorityPropertyType<T> propertyType) { |
| this.propertyType = propertyType; |
| this.joinedPriorityKeys = Arrays.toString(propertyType.getPriorityKeys()); |
| this.internalValueReader = collectReader(propertyType.getType()); |
| this.properties = createProperties(propertyType.getPriorityKeys()); |
| initValue(); |
| } |
| |
| private DynamicProperty[] createProperties(String[] priorityKeys) { |
| DynamicProperty[] properties = new DynamicProperty[priorityKeys.length]; |
| for (int idx = 0; idx < priorityKeys.length; idx++) { |
| String key = priorityKeys[idx].trim(); |
| properties[idx] = DynamicProperty.getInstance(key); |
| } |
| return properties; |
| } |
| |
| private Function<DynamicProperty, T> collectReader(Type type) { |
| if (type == int.class || type == Integer.class) { |
| return this::readInt; |
| } |
| |
| if (type == long.class || type == Long.class) { |
| return this::readLong; |
| } |
| |
| if (type == String.class) { |
| return this::readString; |
| } |
| |
| if (type == boolean.class || type == Boolean.class) { |
| return this::readBoolean; |
| } |
| |
| if (type == double.class || type == Double.class) { |
| return this::readDouble; |
| } |
| |
| if (type == float.class || type == Float.class) { |
| return this::readFloat; |
| } |
| |
| throw new IllegalStateException("not support, type=" + type.getTypeName()); |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected T readInt(DynamicProperty property) { |
| return (T) property.getInteger(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected T readLong(DynamicProperty property) { |
| return (T) property.getLong(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected T readString(DynamicProperty property) { |
| return (T) property.getString(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected T readBoolean(DynamicProperty property) { |
| return (T) property.getBoolean(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected T readDouble(DynamicProperty property) { |
| return (T) property.getDouble(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected T readFloat(DynamicProperty property) { |
| return (T) property.getFloat(); |
| } |
| |
| public String[] getPriorityKeys() { |
| return propertyType.getPriorityKeys(); |
| } |
| |
| public T getDefaultValue() { |
| return propertyType.getDefaultValue(); |
| } |
| |
| public DynamicProperty[] getProperties() { |
| return properties; |
| } |
| |
| void initValue() { |
| String effectiveKey = doUpdateFinalValue(); |
| LOGGER.debug("config inited, \"{}\" set to {}, effective key is \"{}\".", |
| joinedPriorityKeys, finalValue, effectiveKey); |
| } |
| |
| synchronized boolean updateValue() { |
| T lastValue = finalValue; |
| String effectiveKey = doUpdateFinalValue(); |
| if (effectiveKey != null) { |
| LOGGER.debug("config changed, \"{}\" changed from {} to {}, effective key is \"{}\".", |
| joinedPriorityKeys, lastValue, finalValue, effectiveKey); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * |
| * @return if value changed, return effectiveKey, otherwise null |
| */ |
| private String doUpdateFinalValue() { |
| T lastValue = finalValue; |
| |
| String effectiveKey = "default value"; |
| T value = propertyType.getDefaultValue(); |
| for (DynamicProperty property : properties) { |
| T propValue = internalValueReader.apply(property); |
| if (propValue == null || propValue.equals(propertyType.getInvalidValue())) { |
| continue; |
| } |
| |
| effectiveKey = property.getName(); |
| value = propValue; |
| break; |
| } |
| |
| if (Objects.equals(lastValue, value)) { |
| return null; |
| } |
| |
| finalValue = value; |
| return effectiveKey; |
| } |
| |
| public T getValue() { |
| return finalValue; |
| } |
| |
| public boolean isChangedKey(String changedKey) { |
| if (changedKey == null) { |
| // property source changed or clear, and so on |
| return true; |
| } |
| |
| for (DynamicProperty property : properties) { |
| if (changedKey.equals(property.getName())) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| } |