Class AbstractConcurrentProcessor<T extends Context>

java.lang.Object
com.univocity.parsers.common.processor.core.AbstractConcurrentProcessor<T>
All Implemented Interfaces:
Processor<T>
Direct Known Subclasses:
ConcurrentRowProcessor

public abstract class AbstractConcurrentProcessor<T extends Context> extends Object implements Processor<T>
A Processor implementation to perform row processing tasks in parallel. The ConcurrentRowProcessor wraps another Processor, and collects rows read from the input. The actual row processing is performed in by wrapped Processor in a separate thread. Note: by default the Context object passed on to the wrapped Processor will not reflect the state of the parser at the time the row as generated, but the current state of the parser instead. You can enable the contextCopyingEnabled flag to generate copies of the Context at the time each row was generated.
See Also:
  • Field Details

    • processor

      private final Processor processor
    • ended

      private boolean ended
    • executor

      private final ExecutorService executor
    • rowCount

      private volatile long rowCount
    • process

      private Future<Void> process
    • currentContext

      private T extends Context currentContext
    • inputQueue

      private AbstractConcurrentProcessor.Node<T extends Context> inputQueue
    • outputQueue

      private volatile AbstractConcurrentProcessor.Node<T extends Context> outputQueue
    • limit

      private final int limit
    • input

      private volatile long input
    • output

      private volatile long output
    • lock

      private final Object lock
    • contextCopyingEnabled

      private boolean contextCopyingEnabled
  • Constructor Details

    • AbstractConcurrentProcessor

      public AbstractConcurrentProcessor(Processor<T> processor)
      Creates a non-blocking AbstractConcurrentProcessor, to perform processing of rows parsed from the input in a separate thread.
      Parameters:
      processor - a regular Processor implementation which will be executed in a separate thread.
    • AbstractConcurrentProcessor

      public AbstractConcurrentProcessor(Processor<T> processor, int limit)
      Creates a blocking ConcurrentProcessor, to perform processing of rows parsed from the input in a separate thread.
      Parameters:
      processor - a regular Processor implementation which will be executed in a separate thread.
      limit - the limit of rows to be kept in memory before blocking the input parsing process.
  • Method Details

    • isContextCopyingEnabled

      public boolean isContextCopyingEnabled()
      Indicates whether this processor should persist the Context object that is sent to the wrapped Processor given in the constructor of this class, so all methods of Context reflect the parser state at the time each row was parsed. Defaults to false
      Returns:
      a flag indicating whether the parsing context must be persisted along with the parsed row so its methods reflect the state of the parser at the time the record was produced.
    • setContextCopyingEnabled

      public void setContextCopyingEnabled(boolean contextCopyingEnabled)
      Configures this processor to persist the Context object that is sent to the wrapped Processor given in the constructor of this class, so all methods of Context reflect the parser state at the time each row was parsed. Defaults to false
      Parameters:
      contextCopyingEnabled - a flag indicating whether the parsing context must be persisted along with the parsed row so its methods reflect the state of the parser at the time the record was produced.
    • processStarted

      public final void processStarted(T context)
      Description copied from interface: Processor
      This method will by invoked by the parser once, when it is ready to start processing the input.
      Specified by:
      processStarted in interface Processor<T extends Context>
      Parameters:
      context - A contextual object with information and controls over the current state of the parsing process
    • startProcess

      private void startProcess()
    • rowProcessed

      public final void rowProcessed(String[] row, T context)
      Description copied from interface: Processor
      Invoked by the parser after all values of a valid record have been processed.
      Specified by:
      rowProcessed in interface Processor<T extends Context>
      Parameters:
      row - the data extracted by the parser for an individual record. Note that:
      context - A contextual object with information and controls over the current state of the parsing process
    • processEnded

      public final void processEnded(T context)
      Description copied from interface: Processor
      This method will by invoked by the parser once, after the parsing process stopped and all resources were closed.

      It will always be called by the parser: in case of errors, if the end of the input us reached, or if the user stopped the process manually using Context.stop().

      Specified by:
      processEnded in interface Processor<T extends Context>
      Parameters:
      context - A contextual object with information and controls over the state of the parsing process
    • grabContext

      private T grabContext(T context)
    • getRowCount

      protected final long getRowCount()
    • copyContext

      protected abstract T copyContext(T context)
    • wrapContext

      protected abstract T wrapContext(T context)