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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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/*
 * JBoss, Home of Professional Open Source
 *
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * 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.xnio.nio;

import java.nio.channels.SelectionKey;
import org.xnio.ChannelListeners;

import static java.lang.Thread.currentThread;
import static org.xnio.IoUtils.safeClose;

/**
* @author David M. Lloyd
*/
final class NioTcpServerHandle extends NioHandle {

    private final Runnable freeTask;
    private final NioTcpServer server;
    private int count;
    private int low;
    private int high;
    private int tokenCount = -1;
    private boolean stopped;

    NioTcpServerHandle(final NioTcpServer server, final SelectionKey key, final WorkerThread thread, final int low, final int high) {
        super(thread, key);
        this.server = server;
        this.low = low;
        this.high = high;
        freeTask = new Runnable() {
            public void run() {
                freeConnection();
            }
        };
    }

    void handleReady(final int ops) {
        ChannelListeners.invokeChannelListener(server, server.getAcceptListener());
    }

    void forceTermination() {
        safeClose(server);
    }

    void terminated() {
        server.invokeCloseHandler();
    }

    Runnable getFreeTask() {
        return freeTask;
    }

    void resume() {
        final WorkerThread thread = getWorkerThread();
        if (thread == currentThread()) {
            if (! stopped && server.resumed) super.resume(SelectionKey.OP_ACCEPT);
        } else {
            thread.execute(new Runnable() {
                public void run() {
                    resume();
                }
            });
        }
    }

    void suspend() {
        final WorkerThread thread = getWorkerThread();
        if (thread == currentThread()) {
            if (stopped || ! server.resumed) super.suspend(SelectionKey.OP_ACCEPT);
        } else {
            thread.execute(new Runnable() {
                public void run() {
                    suspend();
                }
            });
        }
    }

    void channelClosed() {
        final WorkerThread thread = getWorkerThread();
        if (thread == currentThread()) {
            freeConnection();
        } else {
            thread.execute(freeTask);
        }
    }

    void freeConnection() {
        assert currentThread() == getWorkerThread();
        if (count-- <= low && tokenCount != 0 && stopped) {
            stopped = false;
            if (server.resumed) {
                super.resume(SelectionKey.OP_ACCEPT);
            }
        }
    }

    void setTokenCount(final int newCount) {
        WorkerThread workerThread = getWorkerThread();
        if (workerThread == currentThread()) {
            if (tokenCount == 0) {
                tokenCount = newCount;
                if (count <= low && stopped) {
                    stopped = false;
                    if (server.resumed) {
                        super.resume(SelectionKey.OP_ACCEPT);
                    }
                }
                return;
            }
            workerThread = workerThread.getNextThread();
        }
        setThreadNewCount(workerThread, newCount);
    }

    private void setThreadNewCount(final WorkerThread workerThread, final int newCount) {
        final int number = workerThread.getNumber();
        workerThread.execute(new Runnable() {
            public void run() {
                server.getHandle(number).setTokenCount(newCount);
            }
        });
    }

    void initializeTokenCount(final int newCount) {
        WorkerThread workerThread = getWorkerThread();
        final int number = workerThread.getNumber();
        if (workerThread == currentThread()) {
            tokenCount = newCount;
            if (newCount == 0) {
                stopped = true;
                super.suspend(SelectionKey.OP_ACCEPT);
            }
        } else {
            workerThread.execute(new Runnable() {
                public void run() {
                    server.getHandle(number).initializeTokenCount(newCount);
                }
            });
        }
    }

    boolean getConnection() {
        assert currentThread() == getWorkerThread();
        if (stopped) {
            return false;
        }
        if (tokenCount != -1 && --tokenCount == 0) {
            setThreadNewCount(getWorkerThread().getNextThread(), server.getTokenConnectionCount());
        }
        if (++count >= high || tokenCount == 0) {
            stopped = true;
            super.suspend(SelectionKey.OP_ACCEPT);
        }
        return true;
    }

    public void executeSetTask(final int high, final int low) {
        final WorkerThread thread = getWorkerThread();
        if (thread == currentThread()) {
            this.high = high;
            this.low = low;
            if (count >= high && ! stopped) {
                stopped = true;
                suspend();
            } else if (count <= low && stopped) {
                stopped = false;
                if (server.resumed) resume();
            }
        } else {
            thread.execute(new Runnable() {
                public void run() {
                    executeSetTask(high, low);
                }
            });
        }
    }

    int getConnectionCount() {
        assert currentThread() == getWorkerThread();
        return count;
    }
}