eagle-core/eagle-query/eagle-entity-base/src/main/java/org/apache/eagle/log/entity/meta/MetricDefinition.java

/*
 * 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.eagle.log.entity.meta;

import org.apache.hadoop.io.Writable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

public class MetricDefinition implements Writable {
    private static final Logger LOG = LoggerFactory.getLogger(MetricDefinition.class);
    private long interval;
    private Class<?> singleTimestampEntityClass;

    public long getInterval() {
        return interval;
    }

    public void setInterval(long interval) {
        this.interval = interval;
    }

    public Class<?> getSingleTimestampEntityClass() {
        return singleTimestampEntityClass;
    }

    public void setSingleTimestampEntityClass(Class<?> singleTimestampEntityClass) {
        this.singleTimestampEntityClass = singleTimestampEntityClass;
    }

    private static final String EMPTY = "";

    @Override
    public void write(DataOutput out) throws IOException {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Writing metric definition: interval = " + interval + " singleTimestampEntityClass = "
                      + this.singleTimestampEntityClass);
        }
        out.writeLong(interval);
        if (this.singleTimestampEntityClass == null) {
            out.writeUTF(EMPTY);
        } else {
            out.writeUTF(this.singleTimestampEntityClass.getName());
        }
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        interval = in.readLong();
        String singleTimestampEntityClassName = in.readUTF();
        if (!EMPTY.equals(singleTimestampEntityClassName)) {
            try {
                this.singleTimestampEntityClass = Class.forName(singleTimestampEntityClassName);
            } catch (ClassNotFoundException e) {
                if (LOG.isDebugEnabled()) {
                    LOG.warn("Class " + singleTimestampEntityClassName + " not found ");
                }
            }
        }
    }
}