Examples of com.flaptor.hounder.crawler.pagedb.PageDB$PageDBReader

Package com.flaptor.hounder.crawler.pagedb

Examples of com.flaptor.hounder.crawler.pagedb.PageDB$PageDBReader

com.flaptor.hounder.crawler.pagedb.PageDB
The PageDB implements a database of pages. It can be read in url order or in md5 order (md5 hash of the url), which is close to random order. It also takes care of various statistics, like number of pages @author Flaptor Development Team

        try {
            server = new WebServer(8085);
            server.addResourceHandler("/", tmpDir+"/web");
            server.start();


            PageDB db = new PageDB(tmpDir+"/testdb");
            db.open(PageDB.WRITE);
            db.addPage(in);
            db.close();


            crawler = new Crawler();


            int tries = 0;
            int maxTries = 10;
            do {
                tries++;


                crawler.crawl(1);


                db.open(PageDB.READ);
                Iterator<Page> pages = db.iterator();
                assertTrue("The crawler lost or discarded the test page", pages.hasNext());
                out = pages.next();
                assertFalse("The crawler has more than the test page", pages.hasNext());
                db.close();
            } while (out.getRetries() > 0 && tries <= maxTries);


        } finally {
            if (null != crawler) {
                crawler.cleanup();

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        try {
            server = new WebServer(8087);
            server.addResourceHandler("/", tmpDir+"/web");
            server.start();


            PageDB db = new PageDB(tmpDir+"/testdb");
            db.open(PageDB.WRITE);
            db.addPage(in);
            db.close();


            crawler = new Crawler();


            crawler.crawl(2);


            db.open(PageDB.READ);
            Iterator<Page> pages = db.iterator();
            assertTrue("The crawler lost or discarded all test pages", pages.hasNext());
            one = pages.next();
            assertTrue("The crawler lost or discarded the second test page", pages.hasNext());
            two = pages.next();
            assertFalse("The crawler has more than two pages", pages.hasNext());
            db.close();
        } finally {
            if (null != crawler) {
                crawler.cleanup();
            }
            server.requestStop();

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        runRandomCrawl(100, 10, 30);
    }


    private int getPageDBFetchedCount (long[] fetchAttempts) throws Exception {
        int changed = 0;
        PageDB db = new PageDB(tmpDir+"/testdb");
        for (Page page : db) {
            int num = page.getUrl().charAt(26)-'0';
            long attempt = page.getLastAttempt();
            if (attempt != fetchAttempts[num]) {
                fetchAttempts[num] = attempt;
                changed++;
            }
        }
        db.close();
        return changed;
    }

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        db.close();
        return changed;
    }


    private float[] getPageDBPriorities () throws Exception {
        PageDB db = new PageDB(tmpDir+"/testdb");
        float[] pri = new float[(int)db.getSize()+1];
        for (Page page : db) {
            int num = page.getUrl().charAt(26)-'0';
            pri[num] = page.getPriority();
        }
        db.close();
        return pri;
    }

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        server.stop();
    }




    private float[] getPageDBScores (SimWeb web) throws Exception {
        PageDB db = new PageDB(tmpDir+"/testdb");
        float[] score = new float[(int)db.getSize()];
        for (Page page : db) {
            int num = SimWeb.urlToPage(page.getUrl());
            score[num] = page.getScore();
        }
        db.close();
        return score;
    }

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        db.close();
        return score;
    }


    private float[] getPageDBAntiScores (SimWeb web) throws Exception {
        PageDB db = new PageDB(tmpDir+"/testdb");
        int size = (int)db.getSize();
        float[] antiScore = new float[(int)db.getSize()];
        for (Page page : db) {
            int num = SimWeb.urlToPage(page.getUrl());
            antiScore[num] = page.getAntiScore();
        }
        db.close();
        return antiScore;
    }

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        PageDistributor distributor = new PageDistributor(nodes, node, mapper);
        Page page1 = PageTest.randomPage();
        page1.setUrl("http://example.com/test0=0");
        IRemotePageCatcher stubCatcher= distributor.getCatcher(page1);
        stubCatcher.addPage(page1);
        PageDB db = localCatcher.getCatch();
        db.open(PageDB.READ);
        Iterator<Page> pages = db.iterator();
        assertTrue("The page sent through rmi did not survive the adventure.", pages.hasNext());
        Page page2 = pages.next();
        assertTrue("The page has been changed by the trip through rmi:\n  1: "+page1+"\n  2: "+page2, page1.equals(page2));
        assertFalse("Sent one page through rmi and more than one came out the other end.", pages.hasNext());
        db.close();
    }

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            done = 0;
            new DBCloser(0).start();
            new DBCloser(1).start();
            while (done < 2) Execute.sleep(100);


            PageDB db = new PageDB(dbNames[0]);
            db.open(DPageDB.READ);
            Iterator<Page> pages = db.iterator();
            assertTrue("The first distributed pagedb should have two pages, yet it has none.", pages.hasNext());
            Page page1 = pages.next();
            assertTrue("One of the pages in the first distributed pagedb is not expected: "+page1.getUrl(), page1.equals(page00) || page1.equals(page10));
            assertTrue("The first distributed pagedb should have two pages, yet it has one.", pages.hasNext());
            Page page2 = pages.next();
            assertTrue("One of the pages in the first distributed pagedb is not expected: "+page2.getUrl(), page2.equals(page00) || page2.equals(page10));
            assertFalse("One of the pages in the first distributed pagedb has been cloned:"+page1.getUrl(), page1.equals(page2)); 
            assertFalse("The first distributed pagedb should have two pages, yet it has more.", pages.hasNext());
            db.close();


            db = new PageDB(dbNames[1]);
            db.open(DPageDB.READ);
            pages = db.iterator();
            assertTrue("The second distributed pagedb should have two pages, yet it has none.", pages.hasNext());
            page1 = pages.next();
            assertTrue("One of the pages in the second distributed pagedb is not expected: "+page1.getUrl(), page1.equals(page01) || page1.equals(page11));
            assertTrue("The second distributed pagedb should have two pages, yet it has one.", pages.hasNext());
            page2 = pages.next();
            assertTrue("One of the pages in the second distributed pagedb is not expected: "+page2.getUrl(), page2.equals(page01) || page2.equals(page11));
            assertFalse("One of the pages in the second distributed pagedb has been cloned:"+page1.getUrl(), page1.equals(page2)); 
            assertFalse("The second pagedb should have two pages, yet it has more.", pages.hasNext());
            db.close();
        }
    }

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    @Override
    public void close () throws IOException {
        if ((mode & 0x0F) != READ) {
            logger.info("DPageDB ready for close. Will merge "+pageCatcher.catches()+" catched pages.");
            if (pageCatcher.catches() > 0) {
                PageDB db = pageCatcher.getCatch();
                db.open(READ);
                for (Page page : db) {
                    page.setLocal(true);
                    super.addPage (page);
                }
                Execute.close(db);
                db.deleteDir(false);
            }
            if (catcherIsLocal) {
                pageCatcher.stop();
            }
        }

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    // start a new pagedb for storing catched pages.
    private synchronized void newCatcher () {
        try {
            String dirname = catchDir + ".tmp";
            catchdb = new PageDB(dirname);
            catchdb.open(PageDB.WRITE + PageDB.APPEND + PageDB.UNSORTED);
        } catch (IOException e) {
            logger.error(e,e);
            throw new RuntimeException("Creating a new PageCatcher pagedb", e);
        }

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