io.netty.channel.nio.SelectedSelectionKeySet Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project 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 io.netty.channel.nio;

import java.nio.channels.SelectionKey;
import java.util.AbstractSet;
import java.util.Iterator;

final class SelectedSelectionKeySet extends AbstractSet {

    private SelectionKey[] keysA;
    private int keysASize;
    private SelectionKey[] keysB;
    private int keysBSize;
    private boolean isA = true;

    SelectedSelectionKeySet() {
        keysA = new SelectionKey[1024];
        keysB = keysA.clone();
    }

    @Override
    public boolean add(SelectionKey o) {
        if (o == null) {
            return false;
        }

        if (isA) {
            int size = keysASize;
            keysA[size ++] = o;
            keysASize = size;
            if (size == keysA.length) {
                doubleCapacityA();
            }
        } else {
            int size = keysBSize;
            keysB[size ++] = o;
            keysBSize = size;
            if (size == keysB.length) {
                doubleCapacityB();
            }
        }

        return true;
    }

    private void doubleCapacityA() {
        SelectionKey[] newKeysA = new SelectionKey[keysA.length << 1];
        System.arraycopy(keysA, 0, newKeysA, 0, keysASize);
        keysA = newKeysA;
    }

    private void doubleCapacityB() {
        SelectionKey[] newKeysB = new SelectionKey[keysB.length << 1];
        System.arraycopy(keysB, 0, newKeysB, 0, keysBSize);
        keysB = newKeysB;
    }

    SelectionKey[] flip() {
        if (isA) {
            isA = false;
            keysA[keysASize] = null;
            keysBSize = 0;
            return keysA;
        } else {
            isA = true;
            keysB[keysBSize] = null;
            keysASize = 0;
            return keysB;
        }
    }

    @Override
    public int size() {
        if (isA) {
            return keysASize;
        } else {
            return keysBSize;
        }
    }

    @Override
    public boolean remove(Object o) {
        return false;
    }

    @Override
    public boolean contains(Object o) {
        return false;
    }

    @Override
    public Iterator iterator() {
        throw new UnsupportedOperationException();
    }
}