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The AceQL Java Client JDBC Driver allows to wrap the AceQL HTTP APIs and eliminates the tedious works of handling communications errors and parsing JSON results. Android and Java Desktop application developers can access remote SQL databases and/or SQL databases in the cloud by simply including standard JDBC calls in their code, just like they would for a local database.

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/*
 * This file is part of AceQL JDBC Driver.
 * AceQL JDBC Driver: Remote JDBC access over HTTP with AceQL HTTP.                                 
 * Copyright (c) 2023,  KawanSoft SAS
 * (http://www.kawansoft.com). 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 com.aceql.jdbc.commons.main.http;

import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;

import com.aceql.jdbc.commons.main.util.framework.FrameworkDebug;

/**
 * Allows to get the HttpUrlConnection output stream with a real timeout using a
 * thread and a timer.
 * 
 * @author Nicolas de Pomereu
 *
 */
class TimeoutConnector {

    public static boolean DEBUG = FrameworkDebug.isSet(TimeoutConnector.class);

    private HttpURLConnection conn = null;

    /** The network output stream */
    private OutputStream os = null;

    /** boolean that says if we are connected to remote server */
    private boolean connected = false;

    /** Exception thrown by URL.connect() */
    private IOException exception = null;

    private int connectTimeout = 0;

    /**
     * Constructor.
     * 
     * @param conn
     *            the current connection
     * @param connectTimeout
     *            the connection timeout
     */
    public TimeoutConnector(HttpURLConnection conn, int connectTimeout) {
	this.conn = conn;
	this.connectTimeout = connectTimeout;
    }

    /**
     * Gets an output stream from the HttpUrlConnection in less than
     * connectTimeout milliseconds, otherwise throws a SocketTimeoutException
     * 
     * @return the HttpUrlConnection output stream
     * @throws IOException
     * @throws SocketTimeoutException
     */
    public OutputStream getOutputStream()
	    throws IOException, SocketTimeoutException {

	if (connectTimeout <= 0) {
	    return  conn.getOutputStream();
	}
	
	os = null;
	connected = false;
	exception = null;

	Thread t = new Thread() {
	    @Override
	    public void run() {
		try {
		    os = conn.getOutputStream();
		    connected = true;
		} catch (IOException e) {
		    exception = e;
		}
	    }
	};

	t.start();

	long begin = System.currentTimeMillis();

	while (true) {

	    if (connected) {

		if (DEBUG) {
		    long end = System.currentTimeMillis();
		    System.out.println(
			    "Outut Connection get in: " + (end - begin));
		}

		return os;
	    }

	    if (exception != null) {
		throw exception;
	    }

	    if (connectTimeout != 0) {
		long end = System.currentTimeMillis();
		if ((end - begin) > connectTimeout) {
		    throw new SocketTimeoutException(
			    "Unable to establish connection in less than required "
				    + connectTimeout + " milliseconds.");
		}
	    }

	    try {
		Thread.sleep(1); // Very, very short sleep...s
	    } catch (InterruptedException ie) {
		ie.printStackTrace();
	    }
	}
    }

}