org.apache.streams.riak.http.RiakHttpPersistWriter.java Source code

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Here is the source code for org.apache.streams.riak.http.RiakHttpPersistWriter.java

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/*
 * 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
 *
 *   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.streams.riak.http;

import org.apache.streams.core.StreamsDatum;
import org.apache.streams.core.StreamsPersistWriter;
import org.apache.streams.jackson.StreamsJacksonMapper;
import org.apache.streams.riak.pojo.RiakConfiguration;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Objects;

/**
 * RiakHttpPersistWriter writes documents to riak via http.
 */
public class RiakHttpPersistWriter implements StreamsPersistWriter {

    private RiakConfiguration configuration;
    private RiakHttpClient client;

    private static final Logger LOGGER = LoggerFactory.getLogger(RiakHttpPersistWriter.class);

    private static final ObjectMapper MAPPER = StreamsJacksonMapper.getInstance();

    public RiakHttpPersistWriter(RiakConfiguration configuration) {
        this.configuration = configuration;
    }

    @Override
    public String getId() {
        return "RiakHttpPersistWriter";
    }

    @Override
    public void prepare(Object configurationObject) {
        client = RiakHttpClient.getInstance(this.configuration);
    }

    @Override
    public void cleanUp() {
        client = null;
    }

    @Override
    public void write(StreamsDatum entry) {

        Objects.nonNull(client);

        String id = null;
        String document;
        String bucket;
        String bucketType;
        String contentType;
        String charset;
        if (StringUtils.isNotBlank(entry.getId())) {
            id = entry.getId();
        }
        if (entry.getDocument() instanceof String) {
            document = (String) entry.getDocument();
        } else {
            try {
                document = MAPPER.writeValueAsString(entry.getDocument());
            } catch (Exception e) {
                LOGGER.warn("Exception", e);
                return;
            }
        }
        if (entry.getMetadata() != null && entry.getMetadata().containsKey("bucket")
                && entry.getMetadata().get("bucket") instanceof String
                && StringUtils.isNotBlank((String) entry.getMetadata().get("bucket"))) {
            bucket = (String) entry.getMetadata().get("bucket");
        } else {
            bucket = configuration.getDefaultBucket();
        }
        if (entry.getMetadata() != null && entry.getMetadata().containsKey("bucketType")
                && entry.getMetadata().get("bucketType") instanceof String
                && StringUtils.isNotBlank((String) entry.getMetadata().get("bucketType"))) {
            bucketType = (String) entry.getMetadata().get("bucketType");
        } else {
            bucketType = configuration.getDefaultBucketType();
        }
        if (entry.getMetadata() != null && entry.getMetadata().containsKey("charset")
                && entry.getMetadata().get("charset") instanceof String
                && StringUtils.isNotBlank((String) entry.getMetadata().get("charset"))) {
            charset = (String) entry.getMetadata().get("charset");
        } else {
            charset = configuration.getDefaultCharset();
        }
        if (entry.getMetadata() != null && entry.getMetadata().containsKey("contentType")
                && entry.getMetadata().get("contentType") instanceof String
                && StringUtils.isNotBlank((String) entry.getMetadata().get("contentType"))) {
            contentType = (String) entry.getMetadata().get("contentType");
        } else {
            contentType = configuration.getDefaultContentType();
        }

        URIBuilder uriBuilder = new URIBuilder(client.baseURI);
        if (bucket != null && StringUtils.isNotBlank(bucket)) {
            uriBuilder.setPath("/riak/" + bucket);
        }
        if (id != null && StringUtils.isNotBlank(id)) {
            uriBuilder.setPath("/riak/" + bucket + "/" + id);
        }

        URI uri;
        try {
            uri = uriBuilder.build();
        } catch (URISyntaxException e) {
            LOGGER.warn("URISyntaxException", e);
            return;
        }

        HttpPost post = new HttpPost();
        post.setHeader("Content-Type", contentType + "; charset=" + charset);
        post.setURI(uri);
        HttpEntity entity;
        try {
            entity = new StringEntity(document);
            post.setEntity(entity);
        } catch (UnsupportedEncodingException e) {
            LOGGER.warn("UnsupportedEncodingException", e);
            return;
        }

        try {
            HttpResponse response = client.client().execute(post);
        } catch (IOException e) {
            LOGGER.warn("IOException", e);
            return;
        }

    }
}