/**
* This file is part of Graylog2.
*
* Graylog2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog2. If not, see <http://www.gnu.org/licenses/>.
*/
package org.graylog2.outputs;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import org.graylog2.database.NotFoundException;
import org.graylog2.plugin.configuration.Configuration;
import org.graylog2.plugin.outputs.MessageOutput;
import org.graylog2.plugin.outputs.MessageOutputConfigurationException;
import org.graylog2.plugin.streams.Output;
import org.graylog2.streams.OutputService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* @author Lennart Koopmann <lennart@torch.sh>
*/
@Singleton
public class OutputRegistry {
private static final Logger LOG = LoggerFactory.getLogger(OutputRegistry.class);
private final Map<String, MessageOutput> runningMessageOutputs;
private final MessageOutput defaultMessageOutput;
private final OutputService outputService;
private final MessageOutputFactory messageOutputFactory;
@Inject
public OutputRegistry(@DefaultMessageOutput MessageOutput defaultMessageOutput,
OutputService outputService,
MessageOutputFactory messageOutputFactory) {
this.defaultMessageOutput = defaultMessageOutput;
this.outputService = outputService;
this.messageOutputFactory = messageOutputFactory;
this.runningMessageOutputs = new HashMap<>();
}
public MessageOutput getOutputForId(String id) {
if (!getRunningMessageOutputs().containsKey(id))
try {
final Output output = outputService.load(id);
register(id, launchOutput(output));
} catch (NotFoundException | MessageOutputConfigurationException e) {
LOG.error("Unable to launch output <{}>: {}", id, e);
return null;
}
return getRunningMessageOutputs().get(id);
}
protected void register(String id, MessageOutput output) {
this.runningMessageOutputs.put(id, output);
}
protected MessageOutput launchOutput(Output output) throws MessageOutputConfigurationException {
final MessageOutput messageOutput = messageOutputFactory.fromStreamOutput(output);
if (messageOutput == null)
throw new IllegalArgumentException("Failed to instantiate MessageOutput from Output: " + output);
messageOutput.initialize(new Configuration(output.getConfiguration()));
return messageOutput;
}
protected Map<String, MessageOutput> getRunningMessageOutputs() {
return ImmutableMap.copyOf(runningMessageOutputs);
}
public Set<MessageOutput> getMessageOutputs() {
Set<MessageOutput> runningOutputs = new HashSet<>(this.runningMessageOutputs.values());
runningOutputs.add(defaultMessageOutput);
return ImmutableSet.copyOf(runningOutputs);
}
}