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a31b9097a4
two main changes must be implemented to enable mass remote crawls: - shift control of robots.txt to crawl queue (away from stacker). This is necessary since remote crawls can contain unchecked urls. Each peer must check the robots to prevent that it is misused as crawl agent for unwanted file retrieval - implement new index files that control double-check of remotely crawled urls After removal of robots.txt checking from stacker threads, the multi-threading of this process is void. Multithreading has been removed. Also the thread pools for the crawl threads had been removed, since creation of these threads is not resource-consuming, for a detailed explanation see svn 4106 git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4181 6c8d7289-2bf4-0310-a012-ef5d649a1542
101 lines
4.0 KiB
Java
101 lines
4.0 KiB
Java
//serverSemaphore.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@anomic.de
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2005
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//
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//this file is contributed by Martin Thelian
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//last major change: $LastChangedDate$ by $LastChangedBy$
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//Revision: $LastChangedRevision$
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//
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notive above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package de.anomic.server;
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public final class serverSemaphore {
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private long currentValue = 0;
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private long maximumValue = Long.MAX_VALUE;
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public serverSemaphore(long initialValue) {
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this(initialValue,Long.MAX_VALUE);
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}
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protected serverSemaphore(long initialValue, long maxValue) {
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/* some errorhandling */
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if (maxValue < initialValue) {
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throw new IllegalArgumentException("The semaphore maximum value must not be " +
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"greater than the semaphore init value.");
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}
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if (maxValue < 1) {
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throw new IllegalArgumentException("The semaphore maximum value must be greater or equal 1.");
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}
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if (initialValue < 0) {
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throw new IllegalArgumentException("The semaphore initial value must be greater or equal 0.");
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}
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// setting the initial Sempahore Values
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this.currentValue = initialValue;
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this.maximumValue = maxValue;
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}
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public synchronized void P() throws InterruptedException
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{
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this.currentValue-- ;
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if (this.currentValue < 0) {
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try {
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wait();
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} catch(InterruptedException e) {
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this.currentValue++;
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throw e;
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}
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}
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}
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public synchronized void V() {
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if (this.currentValue+1 == this.maximumValue) {
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throw new IndexOutOfBoundsException("The maximum value of the semaphore was reached");
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}
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this.currentValue++;
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if (this.currentValue <= 0) {
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notify();
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}
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}
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} |