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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.diag;
import java.io.Serializable;
import java.util.Map;
import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
/**
* Base class for internally emitted events used for diagnostics and testing.
*/
public abstract class DiagnosticEvent
{
/**
* Event creation time.
*/
public final long timestamp = currentTimeMillis();
/**
* Name of allocating thread.
*/
public final String threadName = Thread.currentThread().getName();
/**
* Returns event type discriminator. This will usually be a enum value.
*/
public abstract Enum getType();
/**
* Returns map of key-value pairs containing relevant event details. Values can be complex objects like other
* maps, but must be Serializable, as returned values may be consumed by external clients. It's strongly recommended
* to stick to standard Java classes to avoid distributing custom classes to clients and also prevent potential
* class versioning conflicts.
*/
public abstract Map toMap();
}