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/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
*/
package org.apache.edgent.topology.spi.graph;

import static org.apache.edgent.window.Policies.alwaysInsert;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import org.apache.edgent.function.BiFunction;
import org.apache.edgent.function.Function;
import org.apache.edgent.function.Functions;
import org.apache.edgent.oplet.window.Aggregate;
import org.apache.edgent.topology.TStream;
import org.apache.edgent.window.Policies;
import org.apache.edgent.window.Window;
import org.apache.edgent.window.Windows;

public class TWindowImpl extends AbstractTWindow {
    private final int size;
    
    TWindowImpl(int size, TStream feed, Function keyFunction){
        super(feed, keyFunction);
        this.size = size;
    }

    @Override
    public  TStream aggregate(BiFunction,K, U> processor) { 
        processor = Functions.synchronizedBiFunction(processor);
        Window> window = Windows.lastNProcessOnInsert(size, getKeyFunction());
        Aggregate op = new Aggregate(window, processor);
        return feeder().pipe(op); 
    }

    @Override
    public  TStream batch(BiFunction, K, U> batcher) {
        batcher = Functions.synchronizedBiFunction(batcher);
        Window> window =
                Windows.window(
                        alwaysInsert(),
                        Policies.doNothing(),
                        Policies.evictAll(),
                        Policies.processWhenFullAndEvict(size),
                        getKeyFunction(),
                        () -> new ArrayList(size));
        
        Aggregate op = new Aggregate(window, batcher);
        return feeder().pipe(op); 
    }

    /**
     * @return the size
     */
    public int getSize() {
        return size;
    }
}