/*
* 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.flume.channel;
import java.util.List;
import java.util.Map;
import org.apache.flume.Channel;
import org.apache.flume.ChannelSelector;
import org.apache.flume.Context;
import org.apache.flume.FlumeException;
import org.apache.flume.conf.BasicConfigurationConstants;
import org.apache.flume.conf.Configurables;
import org.apache.flume.conf.channel.ChannelSelectorConfiguration;
import org.apache.flume.conf.channel.ChannelSelectorType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ChannelSelectorFactory {
private static final Logger LOGGER = LoggerFactory.getLogger(
ChannelSelectorFactory.class);
public static ChannelSelector create(List<Channel> channels,
Map<String, String> config) {
ChannelSelector selector = getSelectorForType(config.get(
BasicConfigurationConstants.CONFIG_TYPE));
selector.setChannels(channels);
Context context = new Context();
context.putAll(config);
Configurables.configure(selector, context);
return selector;
}
public static ChannelSelector create(List<Channel> channels,
ChannelSelectorConfiguration conf) {
String type = ChannelSelectorType.REPLICATING.toString();
if (conf != null){
type = conf.getType();
}
ChannelSelector selector = getSelectorForType(type);
selector.setChannels(channels);
Configurables.configure(selector, conf);
return selector;
}
private static ChannelSelector getSelectorForType(String type) {
if (type == null || type.trim().length() == 0) {
return new ReplicatingChannelSelector();
}
String selectorClassName = type;
ChannelSelectorType selectorType = ChannelSelectorType.OTHER;
try {
selectorType = ChannelSelectorType.valueOf(type.toUpperCase());
} catch (IllegalArgumentException ex) {
LOGGER.debug("Selector type {} is a custom type", type);
}
if (!selectorType.equals(ChannelSelectorType.OTHER)) {
selectorClassName = selectorType.getChannelSelectorClassName();
}
ChannelSelector selector = null;
try {
@SuppressWarnings("unchecked")
Class<? extends ChannelSelector> selectorClass =
(Class<? extends ChannelSelector>) Class.forName(selectorClassName);
selector = selectorClass.newInstance();
} catch (Exception ex) {
throw new FlumeException("Unable to load selector type: " + type
+ ", class: " + selectorClassName, ex);
}
return selector;
}
}