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).


    // always fail
    pipe = new Each( pipe, new Fields( "ip" ), new TestFunction( new Fields( "test" ), null ), Fields.ALL );


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


    Tap sink = getPlatform().getTabDelimitedFile( Fields.ALL, getOutputPath( "allseq/tap" ), SinkMode.REPLACE );
    Tap trap = getPlatform().getTabDelimitedFile( Fields.ALL, getOutputPath( "allseq/trap" ), SinkMode.REPLACE );


    Flow flow = getPlatform().getFlowConnector().connect( "trap test", source, sink, trap, pipe );

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    Pipe pipe = new Pipe( "map" );


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


    pipe = new GroupBy( "reduce", pipe, new Fields( "ip" ) );
    pipe = new Every( pipe, new Count(), new Fields( "ip", "count" ) );
    pipe = new Every( pipe, new TestFailAggregator( new Fields( "fail" ), failAt ), new Fields( "ip", "count" ) );


    Tap sink = getPlatform().getTextFile( getOutputPath( path + "/tap" ), SinkMode.REPLACE );
    Tap trap = getPlatform().getTextFile( getOutputPath( path + "/trap" ), SinkMode.REPLACE );


    Map<String, Tap> traps = Cascades.tapsMap( "reduce", trap );

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    // always fail
    pipe = new Each( pipe, new Fields( "ip" ), new TestFunction( new Fields( "test" ), null ), Fields.ALL );


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


    Tap sink = getPlatform().getTextFile( getOutputPath( "seq/tap" ), SinkMode.REPLACE );
    Tap trap = getPlatform().getTabDelimitedFile( new Fields( "ip" ), getOutputPath( "seq/trap" ), SinkMode.REPLACE );


    Flow flow = getPlatform().getFlowConnector().connect( "trap test", source, sink, trap, pipe );

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    Pipe pipe = new Pipe( "map" );


    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 Count(), new Fields( "ip", "count" ) );


    Tap sink = getPlatform().getTap( scheme, getOutputPath( "trapsourcesink/sink" ), SinkMode.REPLACE );


    Tap trap = getPlatform().getTextFile( new Fields( "line" ), getOutputPath( "trapsourcesink/trap" ), SinkMode.REPLACE );

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    pipe = new Each( pipe, new Fields( "line" ), new RegexSplitter( new Fields( "num", "lower" ), "\\s" ) );


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


    pipe = new Every( pipe, new TestBuffer( new Fields( "next" ), 2, true, true, "next" ) );


    pipe = new Each( pipe, new Insert( new Fields( "final" ), "final" ), Fields.ALL );


    Flow flow = getPlatform().getFlowConnector().connect( source, sink, pipe );

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    pipe = new Each( pipe, new Fields( "line" ), new RegexSplitter( new Fields( "num", "lower" ), "\\s" ) );


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


    pipe = new Every( pipe, new Fields( "lower" ), new TestBuffer( new Fields( "next" ), 1, true, "next" ), Fields.RESULTS );


    pipe = new Each( pipe, new Insert( new Fields( "final" ), "final" ), Fields.ALL );


    Flow flow = getPlatform().getFlowConnector().connect( source, sink, pipe );

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    pipe = new Each( pipe, new Fields( "line" ), new RegexSplitter( new Fields( "num", "lower", "upper" ), "\\s" ) );


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


    pipe = new Every( pipe, new TestBuffer( new Fields( "new" ), new Tuple( "new" ) ), new Fields( "new", "lower", "upper" ) );


    Flow flow = getPlatform().getFlowConnector().connect( source, sink, pipe );


    flow.complete();

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    pipe = new Each( pipe, new Fields( "line" ), new RegexSplitter( new Fields( "num", "lower" ), "\\s" ) );


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


    pipe = new Every( pipe, Fields.VALUES, new TestBuffer( Fields.ARGS ), Fields.REPLACE );


    Flow flow = getPlatform().getFlowConnector().connect( source, sink, pipe );


    flow.complete();

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    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );
    Pipe pipeUpper = new Each( new Pipe( "upper" ), new Fields( "line" ), splitter );


    Pipe splice = new CoGroup( pipeLower, new Fields( "num" ), pipeUpper, new Fields( "num" ), new BufferJoin() );


    splice = new Every( splice, new InnerJoinTestBuffer( Fields.size( 4 ) ), Fields.RESULTS );


    Flow flow = getPlatform().getFlowConnector().connect( sources, sink, splice );


    flow.complete();

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    Pipe pipeLower = new Each( new Pipe( "lower" ), new Fields( "line" ), splitter );
    Pipe pipeUpper = new Each( new Pipe( "upper" ), new Fields( "line" ), splitter );


    Pipe splice = new CoGroup( pipeLower, new Fields( "num" ), pipeUpper, new Fields( "num" ), new BufferJoin() );


    splice = new Every( splice, Fields.size( 1 ), new Count(), Fields.RESULTS );


    try
      {
      Flow flow = getPlatform().getFlowConnector().connect( sources, sink, splice );
      fail();

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