Example usage for org.springframework.integration.file.remote InputStreamCallback InputStreamCallback

Introduction

In this page you can find the example usage for org.springframework.integration.file.remote InputStreamCallback InputStreamCallback.

Prototype

InputStreamCallback

Source Link

Usage

From source file:org.springframework.batch.integration.x.RemoteFileToHadoopTasklet.java

@Override
public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
    final String filePath = chunkContext.getStepContext().getStepExecution().getExecutionContext()
            .getString("filePath");
    Assert.notNull(filePath);/*from  ww w.jav a 2  s  .  c  om*/
    if (logger.isDebugEnabled()) {
        logger.debug("Transferring " + filePath + " to HDFS");
    }
    boolean result = this.template.get(filePath, new InputStreamCallback() {

        @Override
        public void doWithInputStream(InputStream stream) throws IOException {
            OutputStreamWriter writer = new OutputStreamWriter(configuration,
                    new Path(hdfsDirectory + filePath), null);
            byte[] buff = new byte[1024];
            int len;
            while ((len = stream.read(buff)) > 0) {
                if (len == buff.length) {
                    writer.write(buff);
                } else {
                    writer.write(Arrays.copyOf(buff, len));
                }
            }
            writer.close();
        }

    });
    if (!result) {
        throw new MessagingException("Error during file transfer");
    } else {
        if (logger.isDebugEnabled()) {
            logger.debug("Transferred " + filePath + " to HDFS");
        }
        return RepeatStatus.FINISHED;
    }
}

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