/*
* 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.nifi.cluster.event;
import java.util.Date;
import org.apache.commons.lang3.StringUtils;
import org.apache.nifi.reporting.Severity;
/**
* Events describe the occurrence of something noteworthy. They record the event's source, a timestamp, a description, and a category.
*
*
* @Immutable
*/
public class Event implements NodeEvent {
private final String source;
private final long timestamp;
private final Severity severity;
private final String message;
/**
* Creates an event with the current time as the timestamp and a category of "INFO".
*
* @param source the source
* @param message the description
*/
public Event(final String source, final String message) {
this(source, message, Severity.INFO);
}
/**
* Creates an event with the current time as the timestamp.
*
* @param source the source
* @param message the description
* @param severity the event severity
*/
public Event(final String source, final String message, final Severity severity) {
this(source, message, severity, new Date().getTime());
}
/**
* Creates an event with the a category of "INFO".
*
* @param source the source
* @param message the description
* @param timestamp the time of occurrence
*/
public Event(final String source, final String message, final long timestamp) {
this(source, message, Severity.INFO, timestamp);
}
/**
* Creates an event.
*
* @param source the source
* @param message the description
* @param severity the event category
* @param timestamp the time of occurrence
*/
public Event(final String source, final String message, final Severity severity, final long timestamp) {
if (StringUtils.isBlank(source)) {
throw new IllegalArgumentException("Source may not be empty or null.");
} else if (StringUtils.isBlank(message)) {
throw new IllegalArgumentException("Event message may not be empty or null.");
} else if (severity == null) {
throw new IllegalArgumentException("Event category may not be null.");
} else if (timestamp < 0) {
throw new IllegalArgumentException("Timestamp may not be negative: " + timestamp);
}
this.source = source;
this.message = message;
this.severity = severity;
this.timestamp = timestamp;
}
@Override
public Severity getSeverity() {
return severity;
}
@Override
public String getMessage() {
return message;
}
@Override
public String getSource() {
return source;
}
@Override
public long getTimestamp() {
return timestamp;
}
}