eagle-core/eagle-query/eagle-entity-base/src/main/java/org/apache/eagle/log/entity/GenericEntityWriter.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;

import org.apache.eagle.log.base.taggedlog.TaggedLogAPIEntity;
import org.apache.eagle.log.entity.meta.EntityDefinition;
import org.apache.eagle.log.entity.meta.EntityDefinitionManager;
import org.apache.eagle.common.EagleBase64Wrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;

public class GenericEntityWriter {
    private static final Logger LOG = LoggerFactory.getLogger(GenericEntityWriter.class);
    private EntityDefinition entityDef;

    public GenericEntityWriter(String serviceName) throws InstantiationException, IllegalAccessException {
        this.entityDef = EntityDefinitionManager.getEntityByServiceName(serviceName);
        checkNotNull(entityDef, "serviceName");
    }

    public GenericEntityWriter(EntityDefinition entityDef)
        throws InstantiationException, IllegalAccessException {
        this.entityDef = entityDef;
        checkNotNull(entityDef, "serviceName");
    }

    private void checkNotNull(Object o, String message) {
        if (o == null) {
            throw new IllegalArgumentException(message + " should not be null");
        }
    }

    /**
     * @param entities
     * @return row keys
     * @throws Exception
     */
    public List<String> write(List<? extends TaggedLogAPIEntity> entities) throws Exception {
        HBaseLogWriter writer = new HBaseLogWriter(entityDef.getTable(), entityDef.getColumnFamily());
        List<String> rowkeys = new ArrayList<String>(entities.size());
        List<InternalLog> logs = new ArrayList<InternalLog>(entities.size());

        try {
            writer.open();
            for (TaggedLogAPIEntity entity : entities) {
                final InternalLog entityLog = HBaseInternalLogHelper.convertToInternalLog(entity, entityDef);
                logs.add(entityLog);
            }
            List<byte[]> bRowkeys = writer.write(logs);
            for (byte[] rowkey : bRowkeys) {
                rowkeys.add(EagleBase64Wrapper.encodeByteArray2URLSafeString(rowkey));
            }

        } catch (Exception ex) {
            LOG.error("fail writing tagged log", ex);
            throw ex;
        } finally {
            writer.close();
        }
        return rowkeys;
    }
}