com.iveely.computing.component.TupleBuffer.java Source code

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Here is the source code for com.iveely.computing.component.TupleBuffer.java

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/*
 * Copyright 2016 liufanping@iveely.com.
 *
 * 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 com.iveely.computing.component;

import com.iveely.computing.common.StreamPacket;

import org.apache.commons.lang3.SerializationUtils;

import java.util.ArrayList;
import java.util.Map;
import java.util.TreeMap;

/**
 * Tuple cache buffer.
 */
public class TupleBuffer {

    /**
     * Cache list.
     */
    private final Map<Integer, ArrayList<StreamPacket>> list;

    /**
     * Max buffer size for each key. When reach max size will be send out.
     */
    private final Integer MAX_BUFFER_SIZE = 10;

    /**
     * Build tuple buffer instance.
     */
    public TupleBuffer() {
        this.list = new TreeMap<>();
    }

    /**
     * Push data intp buffer.
     *
     * @param index  Index of client to send.
     * @param packet packet to prepare send.
     */
    public void push(int index, StreamPacket packet) {
        if (this.list.containsKey(index)) {
            this.list.get(index).add(packet);
        } else {
            ArrayList<StreamPacket> packets = new ArrayList<>();
            packets.add(packet);
            this.list.put(index, packets);
        }
    }

    /**
     * @return Max cached size.
     */
    public int getMaxStored() {
        return this.MAX_BUFFER_SIZE;
    }

    /**
     * Is full on one client.
     *
     * @param index Index of client.
     * @return True is full,or is not.
     */
    public boolean isFull(int index) {
        if (!this.list.containsKey(index)) {
            return false;
        }
        return this.list.get(index).size() >= MAX_BUFFER_SIZE;
    }

    /**
     * Is empty of cahce.
     *
     * @param index Index of client.
     * @return True is empty.
     */
    public boolean isEmpty(int index) {
        if (!this.list.containsKey(index)) {
            return true;
        }
        return this.list.get(index).isEmpty();
    }

    /**
     * Pop cache to bytes.
     *
     * @param index Index of client.
     * @return Bytes data.
     */
    public byte[] pop(int index) {
        if (isEmpty(index)) {
            return new byte[0];
        }
        byte[] ret = SerializationUtils.serialize(this.list.get(index));
        this.list.remove(index);
        return ret;
    }
}