scray.hdfs.io.osgi.WriteServiceFactory.scala Maven / Gradle / Ivy

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scray adapter to write BLOBs to HDFS

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// See the LICENCE.txt file distributed with this work for additional
// information regarding copyright ownership.
//
// Licensed 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 scray.hdfs.io.osgi

import scray.hdfs.io.index.format.sequence.SequenceFileWriter
import org.osgi.framework.ServiceRegistration
import org.osgi.framework.Bundle
import org.apache.hadoop.io.BytesWritable
import org.apache.hadoop.io.Text
import scray.hdfs.io.index.format.sequence.mapping.impl.OutputTextBytesWritable

import scray.hdfs.io.index.format.Writer
import scray.hdfs.io.write.WriteService
import scray.hdfs.io.write.IHdfsWriterConstats

class WriteServiceFactory extends org.osgi.framework.ServiceFactory[scray.hdfs.io.write.WriteService] {
  
  var writer: WriteServiceImpl = null

  def getService(bundle: Bundle, reg: ServiceRegistration[scray.hdfs.io.write.WriteService]): WriteService = {
    println("Provide service")
    
    val destinationPath = bundle.getBundleContext.getProperty(IHdfsWriterConstats.WriteParameter.destinationPath.toString)
    
    try {
      writer = new WriteServiceImpl
    } catch {
      case e: Exception => println("Error while creating writer " + e)
    }

    writer
  }
  

  def ungetService(bundle: Bundle, reg: ServiceRegistration[scray.hdfs.io.write.WriteService], writer: scray.hdfs.io.write.WriteService): Unit = {
    if(this.writer != null) {
      this.writer.closeAll
    }
  }
  
  def close = {
    if(this.writer != null) {
      writer.closeAll
    }
  }
}