Java ContentReader.isChannelOpen方法代码示例

import org.alfresco.service.cmr.repository.ContentReader; //导入方法依赖的package包/类
/**
 * Performs the following:
 * <ul>
 *   <li>Times the transformation</li>
 *   <li>Ensures that the transformation is allowed</li>
 *   <li>Calls the subclass implementation of {@link #transformInternal(ContentReader, ContentWriter, Map)}</li>
 *   <li>Transforms any exceptions generated</li>
 *   <li>Logs a successful transformation</li>
 * </ul>
 * Subclass need only be concerned with performing the transformation.
 * <p>
 * If the options provided are null, then an empty map will be created.
 */
@SuppressWarnings("deprecation")
public final void transform(
        ContentReader reader,
        ContentWriter writer,
        Map<String, Object> options) throws ContentIOException
{
    // begin timing
    long before = System.currentTimeMillis();
    
    // check options map
    if (options == null)
    {
        options = Collections.emptyMap();
    }
    
    try
    {
        // Check the reliability
        checkReliability(reader, writer);

        // Transform
        transformInternal(reader, writer, options);
    }
    catch (Throwable e)
    {
        // Make sure that this transformation gets set back i.t.o. time taken.
        // This will ensure that transformers that compete for the same transformation
        // will be prejudiced against transformers that tend to fail
        recordTime(10000);   // 10 seconds, i.e. rubbish
        
        throw new ContentIOException("Content conversion failed: \n" +
                "   reader: " + reader + "\n" +
                "   writer: " + writer + "\n" +
                "   options: " + options,
                e);
    }
    finally
    {
        // check that the reader and writer are both closed
        if (reader.isChannelOpen())
        {
            logger.error("Content reader not closed by transformer: \n" +
                    "   reader: " + reader + "\n" +
                    "   transformer: " + this);
        }
        if (writer.isChannelOpen())
        {
            logger.error("Content writer not closed by transformer: \n" +
                    "   writer: " + writer + "\n" +
                    "   transformer: " + this);
        }
    }
    
    // record time
    long after = System.currentTimeMillis();
    recordTime(after - before);
    
    // done
    if (logger.isDebugEnabled())
    {
        logger.debug("Completed transformation: \n" +
                "   reader: " + reader + "\n" +
                "   writer: " + writer + "\n" +
                "   options: " + options + "\n" +
                "   transformer: " + this);
    }
}