org.springframework.cloud.zookeeper.config.ZookeeperPropertySource.java Source code

Introduction

Here is the source code for org.springframework.cloud.zookeeper.config.ZookeeperPropertySource.java

Source

/*
 * Copyright 2013-2015 the original author or authors.
 *
 * 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.springframework.cloud.zookeeper.config;

import java.nio.charset.Charset;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.curator.framework.CuratorFramework;
import org.apache.zookeeper.KeeperException;
import org.springframework.util.ReflectionUtils;

/**
 * {@link org.springframework.core.env.PropertySource} that stores properties
 * from Zookeeper inside a map. Properties are loaded upon class initialization.
 *
 * @author Spencer Gibb
 * @since 1.0.0
 */
public class ZookeeperPropertySource extends AbstractZookeeperPropertySource {

    private static final Log log = LogFactory.getLog(ZookeeperPropertySource.class);

    private Map<String, String> properties = new LinkedHashMap<>();

    public ZookeeperPropertySource(String context, CuratorFramework source) {
        super(context, source);
        findProperties(this.getContext());
    }

    @Override
    public Object getProperty(String name) {
        return this.properties.get(name);
    }

    private byte[] getPropertyBytes(String fullPath) {
        try {
            byte[] bytes = null;
            try {
                bytes = this.getSource().getData().forPath(fullPath);
            } catch (KeeperException e) {
                if (e.code() != KeeperException.Code.NONODE) { // not found
                    throw e;
                }
            }
            return bytes;
        } catch (Exception exception) {
            ReflectionUtils.rethrowRuntimeException(exception);
        }
        return null;
    }

    @Override
    public String[] getPropertyNames() {
        Set<String> strings = this.properties.keySet();
        return strings.toArray(new String[strings.size()]);
    }

    private void findProperties(String path) {
        try {
            log.trace("entering findProperties for path: " + path);
            List<String> children = null;
            try {
                children = this.getSource().getChildren().forPath(path);
            } catch (KeeperException e) {
                if (e.code() != KeeperException.Code.NONODE) { // not found
                    throw e;
                }
            }
            if (children == null || children.isEmpty()) {
                return;
            }
            for (String child : children) {
                String childPath = path + "/" + child;
                byte[] bytes = getPropertyBytes(childPath);
                if (bytes == null || bytes.length == 0) {
                    findProperties(childPath);
                } else {
                    String key = sanitizeKey(childPath);
                    this.properties.put(key, new String(bytes, Charset.forName("UTF-8")));
                }
            }
            log.trace("leaving findProperties for path: " + path);
        } catch (Exception exception) {
            ReflectionUtils.rethrowRuntimeException(exception);
        }
    }

}