/**
* 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.camel.component.zookeeper;
import java.util.List;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.component.zookeeper.operations.WatchedEventProvider;
import org.apache.camel.component.zookeeper.operations.ZooKeeperOperation;
import org.apache.camel.util.ExchangeHelper;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.ACL;
/**
* <code>ZooKeeperUtils</code> contains static utility functions mostly for
* retrieving optional message properties from Message headers.
*/
public final class ZooKeeperUtils {
private ZooKeeperUtils() { }
/**
* Pulls a createMode flag from the header keyed by
* {@link ZooKeeperMessage#ZOOKEEPER_CREATE_MODE} in the given message and
* attempts to parse a {@link CreateMode} from it.
*
* @param message the message that may contain a ZOOKEEPER_CREATE_MODE
* header.
* @return the parsed {@link CreateMode} or null if the header was null or
* not a valid mode flag.
*/
public static CreateMode getCreateMode(Message message, CreateMode defaultMode) {
CreateMode mode = null;
try {
mode = message.getHeader(ZooKeeperMessage.ZOOKEEPER_CREATE_MODE, CreateMode.class);
} catch (Exception e) {
}
if (mode == null) {
String modeHeader = message.getHeader(ZooKeeperMessage.ZOOKEEPER_CREATE_MODE, String.class);
mode = getCreateModeFromString(modeHeader, defaultMode);
}
return mode == null ? defaultMode : mode;
}
public static CreateMode getCreateModeFromString(String modeHeader, CreateMode defaultMode) {
CreateMode mode = null;
if (modeHeader != null) {
try {
mode = CreateMode.valueOf(modeHeader);
} catch (Exception e) {
}
}
return mode == null ? defaultMode : mode;
}
/**
* Pulls the target node from the header keyed by
* {@link ZooKeeperMessage#ZOOKEEPER_NODE}. This node is then typically used
* in place of the configured node extracted from the endpoint uri.
*
* @param message the message that may contain a ZOOKEEPER_NODE header.
* @return the node property or null if the header was null
*/
public static String getNodeFromMessage(Message message, String defaultNode) {
return getZookeeperProperty(message, ZooKeeperMessage.ZOOKEEPER_NODE, defaultNode, String.class);
}
public static Integer getVersionFromMessage(Message message) {
return getZookeeperProperty(message, ZooKeeperMessage.ZOOKEEPER_NODE_VERSION, -1, Integer.class);
}
public static byte[] getPayloadFromExchange(Exchange exchange) {
return ExchangeHelper.convertToType(exchange, byte[].class, exchange.getIn().getBody());
}
@SuppressWarnings("unchecked")
public static List<ACL> getAclListFromMessage(Message in) {
return getZookeeperProperty(in, ZooKeeperMessage.ZOOKEEPER_ACL, Ids.OPEN_ACL_UNSAFE, List.class);
}
public static <T> T getZookeeperProperty(Message m, String propertyName, T defaultValue, Class<? extends T> type) {
T value = m.getHeader(propertyName, type);
if (value == null) {
value = defaultValue;
}
return value;
}
public static WatchedEvent getWatchedEvent(ZooKeeperOperation<?> zooKeeperOperation) {
WatchedEvent watchedEvent = null;
if (zooKeeperOperation instanceof WatchedEventProvider) {
watchedEvent = ((WatchedEventProvider)zooKeeperOperation).getWatchedEvent();
}
return watchedEvent;
}
public static boolean hasWatchedEvent(ZooKeeperOperation<?> zooKeeperOperation) {
return getWatchedEvent(zooKeeperOperation) != null;
}
}