org.gridgain.scalar.lang.ScalarReducer3.scala Maven / Gradle / Ivy

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Java-based middleware for in-memory processing of big data in a distributed environment.

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/* 
 Copyright (C) GridGain Systems. All Rights Reserved.
 
 Licensed 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.gridgain.scalar.lang

import collection._
import org.gridgain.grid.util.lang.GridReducer3

/**
 * Peer deploy aware adapter for Java's `GridReducer3`.
 */
class ScalarReducer3[E1, E2, E3, R](private val r: (Seq[E1], Seq[E2], Seq[E3]) => R)
    extends GridReducer3[E1, E2, E3, R] {
    assert(r != null)

    private val buf1 = new mutable.ListBuffer[E1]
    private val buf2 = new mutable.ListBuffer[E2]
    private val buf3 = new mutable.ListBuffer[E3]

    /**
     * Delegates to passed in function.
     */
    def apply = r(buf1.toSeq, buf2.toSeq, buf3.toSeq)

    /**
     * Collects given values.
     *
     * @param e1 Value to collect for later reduction.
     * @param e2 Value to collect for later reduction.
     * @param e3 Value to collect for later reduction.
     */
    def collect(e1: E1, e2: E2, e3: E3) = {
        buf1 += e1
        buf2 += e2
        buf3 += e3

        true
    }
}