Examples of cascading.pipe.Every

cascading.pipe.Every
The Every operator applies an {@link Aggregator} or {@link Buffer} to every grouping.
Any number of Every instances may follow other Every, {@link GroupBy}, or {@link CoGroup} instances if they apply anAggregator, not a Buffer. If a Buffer, only one Every may follow a GroupBy or CoGroup.
Every operators create aggregate values for every grouping they encounter. This aggregate value is added to the current grouping Tuple.
In the case of a CoGroup, the grouping Tuple will be all the grouping keys from all joined streams, and if an "outer" type join is used, one value on the groupingTuple may be null.
Subsequent Every instances can continue to append values to the grouping Tuple. When an Each follows and Every, the Each applies its operation to the grouping Tuple (thus all child values in the grouping are discarded and only aggregate values are propagated).


    pipe = new GroupBy( pipe, new Fields( "ip" ) );


    pipe = new Checkpoint( "checkpoint", pipe );


    pipe = new Every( pipe, new Count(), new Fields( "ip", "count" ) );


    Tap sink = getPlatform().getTextFile( getOutputPath( "failcheckpointevery/sink" ), SinkMode.REPLACE );


    Tap checkpoint = getPlatform().getDelimitedFile( Fields.ALL, true, getOutputPath( "failcheckpointevery/tap" ), SinkMode.REPLACE );

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    pipe = new Checkpoint( "checkpoint", pipe );


    pipe = new GroupBy( pipe, new Fields( "ip" ) );


    pipe = new Every( pipe, new Count(), new Fields( "ip", "count" ) );


    Tap sink = getPlatform().getTextFile( getOutputPath( "failcheckpointdeclared/sink" ), SinkMode.REPLACE );


    Tap checkpoint = getPlatform().getTextFile( getOutputPath( "failcheckpointdeclared/tap" ), SinkMode.REPLACE );

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    pipe = new Checkpoint( "checkpoint", pipe );


    pipe = new GroupBy( pipe, new Fields( "ip" ) );


    pipe = new Every( pipe, new Count(), new Fields( "ip", "count" ) );


    pipe = new Checkpoint( "checkpoint", pipe );


    Tap sink = getPlatform().getTextFile( getOutputPath( "duplicatecheckpoint" ), SinkMode.REPLACE );

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    pipe = new Checkpoint( pipe );


    pipe = new GroupBy( pipe, new Fields( "ip" ) );


    pipe = new Every( pipe, new Count(), new Fields( "ip", "count" ) );


    pipe = new Each( pipe, new TestFunction( new Fields( "insert" ), new Tuple( "value" ), fail ? 2 : -1 ) );


    Tap sink = getPlatform().getTextFile( sinkPath, SinkMode.REPLACE );

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      else
        throw new IllegalStateException( "unknown operation: " + eachElement.getOperation().getClass().getCanonicalName() );
      }
    else if( element instanceof Every )
      {
      Every everyElement = (Every) element;


      if( everyElement.isBuffer() )
        rhsDuct = new BufferEveryWindow( flowProcess, everyElement );
      else if( everyElement.isAggregator() )
        rhsDuct = new AggregatorEveryStage( flowProcess, everyElement );
      else if( everyElement.isGroupAssertion() )
        rhsDuct = new GroupAssertionEveryStage( flowProcess, everyElement );
      else
        throw new IllegalStateException( "unknown operation: " + everyElement.getOperation().getClass().getCanonicalName() );
      }
    else if( element instanceof Boundary )
      {
      rhsDuct = createBoundaryStage( (Boundary) element, role );
      }

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  @Test
  public void testName()
    {
    Pipe count = new Pipe( "count" );
    Pipe pipe = new GroupBy( count, new Fields( 1 ) );
    pipe = new Every( pipe, new Fields( 1 ), new Count(), new Fields( 0, 1 ) );


    assertEquals( "not equal: count.getName()", "count", count.getName() );
    assertEquals( "not equal: pipe.getName()", "count", pipe.getName() );


    pipe = new Each( count, new Fields( 1 ), new RegexSplitter( Fields.size( 2 ) ) );

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    sources.put( "count", new Hfs( new TextLine( new Fields( "first", "second" ) ), "input/path" ) );
    sinks.put( "count", new Hfs( new TextLine( new Fields( 0, 1 ) ), "output/path" ) );


    Pipe pipe = new Pipe( "count" );
    pipe = new GroupBy( pipe, new Fields( 1 ) );
    pipe = new Every( pipe, new Fields( 1 ), new Count(), new Fields( 0, 1 ) );


    List steps = getPlatform().getFlowConnector().connect( sources, sinks, pipe ).getFlowSteps();


    assertEquals( "wrong size", 1, steps.size() );

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    Pipe pipe = new Pipe( "count" );
    pipe = new Each( pipe, new Fields( 1 ), new Identity(), new Fields( 2 ) ); // in:second out:all
    pipe = new Each( pipe, new Fields( 0 ), new Identity( new Fields( "_all" ) ), new Fields( 1 ) ); // in:all out:_all
    pipe = new GroupBy( pipe, new Fields( 0 ) ); // in:_all out:_all
    pipe = new Every( pipe, new Fields( 0 ), new Count(), new Fields( 0, 1 ) ); // in:_all out:_all,count


    List steps = getPlatform().getFlowConnector().connect( sources, sinks, pipe ).getFlowSteps();


    assertEquals( "wrong size", 1, steps.size() );

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    sources.put( "count", new Hfs( new TextLine( new Fields( "first", "second" ) ), "input/path" ) );
    sinks.put( "count", new Hfs( new TextLine( new Fields( 0, 1 ) ), "output/path" ) );


    Pipe pipe = new Pipe( "count" );
    pipe = new Each( pipe, new Identity() );
    pipe = new Every( pipe, new Fields( 1 ), new Count(), new Fields( 0, 1 ) );


    try
      {
      Flow flow = getPlatform().getFlowConnector().connect( sources, sinks, pipe );
      fail( "did not throw flow exception" );

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    pipe = new Each( pipe, new Fields( "line" ), new RegexParser( new Fields( "ip" ), "^[^ ]*" ), new Fields( "ip" ) );


    pipe = new GroupBy( pipe, new Fields( "ip" ) );


    pipe = new Every( pipe, new Fields( "ip" ), new Count(), new Fields( "ip", "count" ) );


    pipe = new Each( pipe, new Fields( "ip" ), new RegexFilter( "^68.*" ) );


    Pipe left = new Each( new Pipe( "left", pipe ), new Fields( "ip" ), new RegexFilter( ".*46.*" ) );

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