/**

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  */

 package org.archive.modules.writer;

 import java.io.IOException;

 import java.util.List;

 import java.util.concurrent.atomic.AtomicInteger;

 import org.apache.hadoop.hbase.client.Get;

 import org.apache.hadoop.hbase.client.HTable;

 import org.apache.hadoop.hbase.util.Bytes;

 import org.apache.log4j.Logger;

 import org.archive.io.ReplayInputStream;

 import org.archive.io.WriterPool;

 import org.archive.io.hbase.HBaseParameters;

 import org.archive.io.hbase.HBaseWriter;

 import org.archive.io.hbase.HBaseWriterPool;

 import org.archive.io.warc.WARCWriterPoolSettings;

 import org.archive.modules.CrawlURI;

 import org.archive.modules.ProcessResult;

 import org.archive.spring.ConfigPath;

 import org.archive.uid.RecordIDGenerator;

 import org.archive.util.ArchiveUtils;

 // TODO: Auto-generated Javadoc

 /**

  * A <a href="http://crawler.archive.org">Heritrix 3</a> processor that writes

  * to <a href="http://hbase.org">Hadoop HBase</a>.

  * 

  * The following example shows how to configure the crawl job configuration.

  * 

  * <pre>

  * {@code

  * <bean id="hbaseParameterSettings" class="org.archive.io.hbase.HBaseParameters">

  *         <!-- These settings are required -->

  *         <property name="zkQuorum" value="localhost" />

  *         <property name="hbaseTableName" value="crawl" />

  * 

  *         <!-- This should reflect your installation, but 2181 is the default -->

  *         <property name="zkPort" value="2181" />

  * 

  *         <!-- All other settings are optional -->

  *         <property name="onlyProcessNewRecords" value="false" />

  *         <property name="onlyWriteNewRecords" value="false" />

  *         <property name="contentColumnFamily" value="newcontent" />

  *  <property name="defaultMaxFileSizeInBytes" value="26214400" />

  *  <!-- 25 *  1024 * 1024 = 26214400 bytes -->

  *         <!-- Overwrite more options here -->

  * </bean>

  * 

  * <bean id="hbaseWriterProcessor" class="org.archive.modules.writer.HBaseWriterProcessor">

  *         <property name="hbaseParameters">

  *                  <ref bean="hbaseParameterSettings"/> 

  *         </property>

  * </bean>

  * 

  * <bean id="dispositionProcessors" class="org.archive.modules.DispositionChain">

  *         <property name="processors">

  *                  <list>

  *                         <ref bean="hbaseWriterProcessor"/>

  *                         <!-- other references -->

  *                 </list>

  *          </property>

  * </bean>

  * }

  * </pre>

  * 

  * @see org.archive.io.hbase.HBaseParameters

  *      {@link org.archive.io.hbase.HBaseParameters} for defining

  *      hbaseParameters

  * 

  */

 public class HBaseWriterProcessor extends WriterPoolProcessor implements WARCWriterPoolSettings {

         /** The Constant log. */

         private static final Logger log = Logger.getLogger(HBaseWriterProcessor.class);

         /** The Constant serialVersionUID. */

         public static final long serialVersionUID = 7019522841438703184L;

         /** The hbase parameters. @see org.archive.io.hbase.HBaseParameters */

         HBaseParameters hbaseParameters = null;

         /**

          * Gets the hbase parameters.

          *

          * @return the hbase parameters

          */

         public synchronized HBaseParameters getHbaseParameters() {

                 if (this.hbaseParameters == null) {

                         this.hbaseParameters = new HBaseParameters();

                 }

                 return this.hbaseParameters;

         }

         /**

          * Sets the hbase parameters.

          *

          * @param options the new hbase parameters

          */

         public void setHbaseParameters(HBaseParameters options) {

                 this.hbaseParameters = options;

         }

         /**

          * Gets the default max file size.

          *

          * @return the default max file size

          */

         @Override

         public long getDefaultMaxFileSize() {

                 if (this.hbaseParameters != null) {

                         return (this.hbaseParameters.getDefaultMaxFileSizeInBytes());                        

                 } 

                 return HBaseParameters.DEFAULT_MAX_FILE_SIZE_IN_BYTES;

         }

         @Override

         protected void setupPool(AtomicInteger serial) {

                 // allow the Heritrix WriterPoolProcessor framework to create new HBaseWriterPools as needed.

                 setPool(generateWriterPool(serial));

         }

         protected WriterPool generateWriterPool(AtomicInteger serial) {

                 return new HBaseWriterPool(serial, this, getPoolMaxActive(), getMaxWaitForIdleMs(), this.hbaseParameters);

         }

         /* (non-Javadoc)

          * @see org.archive.modules.writer.WriterPoolProcessor#innerProcessResult(org.archive.modules.CrawlURI)

          */

         @Override

         protected ProcessResult innerProcessResult(CrawlURI uri) {

                 CrawlURI curi = uri;

                 long recordLength = getRecordedSize(curi);

                 ReplayInputStream replayInputStream = null;

                 try {

                         if (shouldWrite(curi)) {

                                 return write(curi, recordLength, false);

                         }

                 } catch (IOException e) {

                         curi.getNonFatalFailures().add(e);

                         log.error("Failed write of Record: " + curi.toString(), e);

                 } finally {

                         ArchiveUtils.closeQuietly(replayInputStream);

                 }

                 return ProcessResult.PROCEED;

         }

         /*

          * (non-Javadoc)

          * 

          * @see

          * org.archive.modules.Processor#shouldProcess(org.archive.modules.ProcessorURI

          * )

          */

         @Override

         protected boolean shouldProcess(CrawlURI curi) {

                 // The super method is still checked, but we only continue with

                 // process checking if it returns true.

                 if (!super.shouldProcess(curi)) {

                         return false;

                 }

                 // If onlyProcessNewRecords is enabled and the given rowkey has cell

                 // data,then don't process the record.

                 if (hbaseParameters.isOnlyProcessNewRecords()) {

                         try {

                                 return isRecordNew(curi);

                         } catch (IOException e) {

                                 log.error("Failed determining to process uri rowkey: " + curi.toString(), e);

                                 return false;

                         }

                 }

                 // If we make it here, then we passed all our checks and we can assume

                 // we should process the record.

                 return true;

         }

         /**

          * Whether the given CrawlURI should be written to archive files. Annotates

          * CrawlURI with a reason for any negative answer.

          * 

          * @param curi

          *            CrawlURI

          * 

          * @return true if URI should be written; false otherwise

          */

         @Override

         protected boolean shouldWrite(CrawlURI curi) {

                 // The super method is still checked first and overrides anything done

                 // in this method

                 if (!super.shouldWrite(curi)) {

                         return false;

                 }

                 // If the content exceeds the maxContentSize, then dont write.

                 if (curi.getContentSize() > getMaxFileSizeBytes()) {

                         // content size is too large

                         curi.getAnnotations().add(ANNOTATION_UNWRITTEN + ":size");

                         log.warn("Content size for " + curi.getUURI() + " is too large (" + curi.getContentSize() + ") - maximum content size is: " + getMaxFileSizeBytes());

                         return false;

                 }

                 // If onlyWriteNewRecords is enabled and the given rowkey has cell data,

                 // don't write the record.

                 if (hbaseParameters.isOnlyWriteNewRecords()) {

                         try {

                                 if (isRecordNew(curi)) {

                                         return true;

                                 } else {

                                         curi.getAnnotations().add(ANNOTATION_UNWRITTEN + ":not-new");

                                         return false;

                                 }

                         } catch (IOException e) {

                                 log.error("Failed to determine if uri is a new record in the table. For uri rowKey: " + curi.toString() + " using pool: " + getPool().toString(), e);

                         }

                 }

                 // all tests pass, return true to write the content locally.

                 return true;

         }

         /**

          * Determine if the given uri exists as a rowkey in the configured hbase

          * table.

          *

          * @param curi the curi

          * @return true, if checks if is record new

          * @throws IOException Signals that an I/O exception has occurred.

          */

         private boolean isRecordNew(CrawlURI curi) throws IOException {

                 // borrow the writer from the pool

                 HBaseWriter hbaseWriter = (HBaseWriter) getPool().borrowFile();

                 // get the client from the writer

                 HTable hbaseTable = hbaseWriter.getHTable();

                 // Here we can generate the rowkey for this uri ...

                 String url = curi.toString();

                 String row = HBaseWriter.createRowKeyFromUrl(url);

                 // Default is true since we check for conditions to determine if the row key already exists.

                 boolean isNew = true;

                 try {

                         // and look it up to see if it already exists...

                         Get rowToGet = new Get(Bytes.toBytes(row));

                         if (hbaseTable.get(rowToGet) != null && !hbaseTable.get(rowToGet).isEmpty()) {

                                 // if it exists, then its not new

                                 if (log.isDebugEnabled()) {

                                         log.debug("Not A NEW Record - Url: " + url + " has the existing rowkey: " + row + " and has cell data.");

                                 }

                                 isNew = false;

                         }

                 } catch (IOException e) {

                         log.error("Failed to determine if record: " + row + " is a new record due to IOExecption.  Deciding the record is already existing for now.", e);

                         isNew = false;

                 } finally {

                         // always return the client back to the pool no matter what

                         try {

                                 getPool().returnFile(hbaseWriter);

                         } catch (IOException e) {

                                 // and it its not, log as an error

                                 log.error("Failed to add back writer to the pool after checking if a rowkey is new or existing , writerPoolMember: " + hbaseWriter, e);

                                 isNew = false;

                         }

                 }

                 // if we are here then the row key must be new  (it does not exist), 

                 // so its a new record, isNew should still be set to "true" at this point.

                 if (log.isDebugEnabled()) {

                         log.debug("Found A NEW Record - Url: " + url + " has no existing rowkey: " + row );

                 }

                 return isNew;

         }

         /**

          * Write to HBase.

          * 

          * @param curi

          *            the curi

          * @param recordLength

          *            the record length

          * @param in

          *            the in

          * 

          * @return the process result

          * 

          * @throws IOException

          *             Signals that an I/O exception has occurred.

          */

         protected ProcessResult write(final CrawlURI curi, long recordLength, boolean doNotWriteContent) throws IOException {

                 // grab the writer from the pool

                 HBaseWriter hbaseWriter = (HBaseWriter) getPool().borrowFile();

                 // get the member position for logging Total Bytes Written

                 long writerPoolMemberPosition = hbaseWriter.getPosition();

                 try {

                         // write the crawled data to hbase

                         hbaseWriter.write(curi, getHostAddress(curi), curi.getRecorder().getRecordedOutput(), curi.getRecorder().getRecordedInput());

                 } finally {

                         // log total bytes written

                         setTotalBytesWritten(getTotalBytesWritten() + (hbaseWriter.getPosition() - writerPoolMemberPosition));

                         // return the hbaseWriter client back to the pool.

                         getPool().returnFile(hbaseWriter);

                 }

                 // to alert heritrix what action to take next in the crawl

                 return checkBytesWritten();

         }

         /**

          * Gets the default store paths.

          *

          * @return the default store paths

          */

         @Override

         public List<ConfigPath> getDefaultStorePaths() {

                 return null;

         }

         /* (non-Javadoc)

          * @see org.archive.modules.writer.WriterPoolProcessor#getMetadata()

          */

         @Override

         public List<String> getMetadata() {

                 return null;

         }

         /* (non-Javadoc)

          * @see org.archive.io.warc.WARCWriterPoolSettings#getRecordIDGenerator()

          */

         @Override

         public RecordIDGenerator getRecordIDGenerator() {

                 return null;

         }

 }