org.apache.flume.sink.hbase.JsonHbaseEventSerializer.java Source code

Introduction

Here is the source code for org.apache.flume.sink.hbase.JsonHbaseEventSerializer.java

Source

/*
 * 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.flume.sink.hbase;

import java.nio.charset.Charset;
import java.util.Calendar;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.FlumeException;
import org.apache.flume.conf.ComponentConfiguration;
import org.apache.hadoop.hbase.client.Increment;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Row;

import com.google.common.collect.Lists;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class JsonHbaseEventSerializer implements HbaseEventSerializer {

    private static final String CHARSET_CONFIG = "charset";
    private static final String CHARSET_DEFAULT = "UTF-8";

    protected static final AtomicLong nonce = new AtomicLong(0);

    protected byte[] cf;
    private byte[] payload;
    private Map<String, String> headers;
    private Charset charset;

    @Override
    public void configure(Context context) {
        charset = Charset.forName(context.getString(CHARSET_CONFIG, CHARSET_DEFAULT));
    }

    @Override
    public void configure(ComponentConfiguration conf) {
    }

    @Override
    public void initialize(Event event, byte[] columnFamily) {
        this.headers = event.getHeaders();
        this.payload = event.getBody();
        this.cf = columnFamily;
    }

    protected byte[] getRowKey(Calendar cal) {
        String rowKey = String.format("%s%s", cal.getTimeInMillis(), nonce.getAndIncrement());
        return rowKey.getBytes(charset);
    }

    protected byte[] getRowKey() {
        return getRowKey(Calendar.getInstance());
    }

    @Override
    public List<Row> getActions() throws FlumeException {
        List<Row> actions = Lists.newArrayList();
        try {

            byte[] rowKey = getRowKey();

            Put put = new Put(rowKey);

            JsonElement element = new JsonParser().parse(new String(payload));

            if (element.isJsonNull()) {
                return actions;
            }

            if (!element.isJsonObject()) {
                return actions;
            }

            JsonObject jsonObject = element.getAsJsonObject();

            Set<Entry<String, JsonElement>> sets = jsonObject.entrySet();

            sets.remove("headers");

            for (Entry<String, JsonElement> entry : sets) {
                String xcontent = entry.getValue().toString();
                if (xcontent.startsWith("\"") && xcontent.endsWith("\"")) {
                    xcontent = xcontent.substring(1, xcontent.length() - 1);
                }
                put.addColumn(cf, entry.getKey().getBytes(charset), xcontent.getBytes(charset));
            }

            for (Map.Entry<String, String> entry : headers.entrySet()) {
                put.addColumn(cf, entry.getKey().getBytes(charset), entry.getValue().getBytes(charset));
            }

            actions.add(put);
        } catch (Exception e) {
            throw new FlumeException(e.getMessage(), e);
        }
        return actions;
    }

    @Override
    public List<Increment> getIncrements() {
        return Lists.newArrayList();
    }

    @Override
    public void close() {
    }
}