Example usage for org.springframework.batch.support.transaction TransactionAwareBufferedWriter TransactionAwareBufferedWriter

Introduction

In this page you can find the example usage for org.springframework.batch.support.transaction TransactionAwareBufferedWriter TransactionAwareBufferedWriter.

Prototype

public TransactionAwareBufferedWriter(FileChannel channel, Runnable closeCallback) 

Source Link

Document

Create a new instance with the underlying file channel provided, and a callback to execute on close.

Usage

From source file:org.emonocot.job.io.StaxEventItemWriter.java

/**
 * Helper method for opening output source at given file position.
 * @param position Set the position/*from  w  w  w . j a  va2s. c  o m*/
 * @param restarted Is this execution being restarted
 */
private void open(final long position, final boolean restarted) {

    File file;
    FileOutputStream os = null;

    try {
        file = resource.getFile();
        FileUtils.setUpOutputFile(file, restarted, overwriteOutput);
        Assert.state(resource.exists(), "Output resource must exist");
        os = new FileOutputStream(file, true);
        channel = os.getChannel();
        setPosition(position);
    } catch (IOException ioe) {
        throw new DataAccessResourceFailureException("Unable to write to file resource: [" + resource + "]",
                ioe);
    }

    XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();

    if (outputFactory.isPropertySupported("com.ctc.wstx.automaticEndElements")) {
        // If the current XMLOutputFactory implementation is supplied by
        // Woodstox >= 3.2.9 we want to disable its
        // automatic end element feature (see:
        // http://jira.codehaus.org/browse/WSTX-165) per
        // http://jira.springframework.org/browse/BATCH-761.
        outputFactory.setProperty("com.ctc.wstx.automaticEndElements", Boolean.FALSE);
    }

    try {
        if (transactional) {
            bufferedWriter = new TransactionAwareBufferedWriter(new OutputStreamWriter(os, encoding),
                    new Runnable() {
                        public void run() {
                            closeStream();
                        }
                    });
        } else {
            bufferedWriter = new BufferedWriter(new OutputStreamWriter(os, encoding));
        }
        delegateEventWriter = outputFactory.createXMLEventWriter(bufferedWriter);
        eventWriter = new NoStartEndDocumentStreamWriter(delegateEventWriter);
        if (!restarted) {
            startDocument(delegateEventWriter);
        }
    } catch (XMLStreamException xse) {
        throw new DataAccessResourceFailureException("Unable to write to file resource: [" + resource + "]",
                xse);
    } catch (UnsupportedEncodingException e) {
        throw new DataAccessResourceFailureException(
                "Unable to write to file resource: [" + resource + "] with encoding=[" + encoding + "]", e);
    }

}

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From source file:org.springframework.batch.item.xml.StaxEventItemWriter.java

/**
 * Helper method for opening output source at given file position
 */// w  ww .  j a va  2 s . c o  m
private void open(long position) {

    File file;
    FileOutputStream os = null;
    FileChannel fileChannel = null;

    try {
        file = resource.getFile();
        FileUtils.setUpOutputFile(file, restarted, false, overwriteOutput);
        Assert.state(resource.exists(), "Output resource must exist");
        os = new FileOutputStream(file, true);
        fileChannel = os.getChannel();
        channel = os.getChannel();
        setPosition(position);
    } catch (IOException ioe) {
        throw new DataAccessResourceFailureException("Unable to write to file resource: [" + resource + "]",
                ioe);
    }

    XMLOutputFactory outputFactory = createXmlOutputFactory();

    if (outputFactory.isPropertySupported("com.ctc.wstx.automaticEndElements")) {
        // If the current XMLOutputFactory implementation is supplied by
        // Woodstox >= 3.2.9 we want to disable its
        // automatic end element feature (see:
        // http://jira.codehaus.org/browse/WSTX-165) per
        // http://jira.spring.io/browse/BATCH-761).
        outputFactory.setProperty("com.ctc.wstx.automaticEndElements", Boolean.FALSE);
    }
    if (outputFactory.isPropertySupported("com.ctc.wstx.outputValidateStructure")) {
        // On restart we don't write the root element so we have to disable
        // structural validation (see:
        // http://jira.spring.io/browse/BATCH-1681).
        outputFactory.setProperty("com.ctc.wstx.outputValidateStructure", Boolean.FALSE);
    }

    try {
        final FileChannel channel = fileChannel;
        if (transactional) {
            TransactionAwareBufferedWriter writer = new TransactionAwareBufferedWriter(channel, new Runnable() {
                @Override
                public void run() {
                    closeStream();
                }
            });

            writer.setEncoding(encoding);
            writer.setForceSync(forceSync);
            bufferedWriter = writer;
        } else {
            bufferedWriter = new BufferedWriter(new OutputStreamWriter(os, encoding));
        }
        delegateEventWriter = createXmlEventWriter(outputFactory, bufferedWriter);
        eventWriter = new NoStartEndDocumentStreamWriter(delegateEventWriter);
        initNamespaceContext(delegateEventWriter);
        if (!restarted) {
            startDocument(delegateEventWriter);
            if (forceSync) {
                channel.force(false);
            }
        }
    } catch (XMLStreamException xse) {
        throw new DataAccessResourceFailureException("Unable to write to file resource: [" + resource + "]",
                xse);
    } catch (UnsupportedEncodingException e) {
        throw new DataAccessResourceFailureException(
                "Unable to write to file resource: [" + resource + "] with encoding=[" + encoding + "]", e);
    } catch (IOException e) {
        throw new DataAccessResourceFailureException("Unable to write to file resource: [" + resource + "]", e);
    }
}

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