Do not cache document in Selectable for selected Html element #73

webmagic-avalon/webmagic-avalon-common/src/main/resources/sql/mysql/schema.sql

@@ -7,3 +7,25 @@ CREATE TABLE `DynamicClass` (
   PRIMARY KEY (`Id`),
   UNIQUE KEY `un_class_name` (`ClassName`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+CREATE TABLE `Spider` (
+  `Id` int(11) unsigned NOT NULL AUTO_INCREMENT,
+  `PageProcessorId` int(11) unsigned NOT NULL AUTO_INCREMENT,
+  `PipelineId` int(11) unsigned NOT NULL AUTO_INCREMENT,
+  `SchedulerId` int(11) unsigned NOT NULL AUTO_INCREMENT,
+  `Config` text NOT NULL,
+  `AddTime` datetime NOT NULL,
+  `UpdateTime` datetime NOT NULL,
+  PRIMARY KEY (`Id`),
+  UNIQUE KEY `un_class_name` (`ClassName`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+CREATE TABLE `PageProcessor` (
+  `Id` int(11) unsigned NOT NULL AUTO_INCREMENT,
+  `ClassName` varchar(200) NOT NULL,
+  `Params` text NOT NULL,
+  `AddTime` datetime NOT NULL,
+  `UpdateTime` datetime NOT NULL,
+  PRIMARY KEY (`Id`),
+  UNIQUE KEY `un_class_name` (`ClassName`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
\ No newline at end of file

webmagic-avalon/webmagic-worker/src/main/java/us/codecraft/webmagic/avalon/web/DashBoardController.java

-package us.codecraft.webmagic.avalon.web;
-
-import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.servlet.ModelAndView;
-
-/**
- * @author code4crafter@gmail.com
- */
-@Controller("dashboard")
-@RequestMapping("/")
-public class DashBoardController {
-
-    @RequestMapping
-    public ModelAndView index() {
-        ModelAndView map = new ModelAndView("dashboard");
-        return map;
-    }
-
-}

webmagic-avalon/webmagic-worker/src/main/java/us/codecraft/webmagic/worker/Worker.java

@@ -8,6 +8,8 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
 
 /**
+ * Container of Spiders.
+ *
  * @author code4crafter@gmail.com
  */
 public class Worker {

webmagic-avalon/webmagic-worker/src/main/java/us/codecraft/webmagic/avalon/web/SpiderController.java → webmagic-avalon/webmagic-worker/src/main/java/us/codecraft/webmagic/worker/controller/SpiderController.java

-package us.codecraft.webmagic.avalon.web;
+package us.codecraft.webmagic.worker.controller;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
+import us.codecraft.webmagic.worker.Worker;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -10,15 +13,19 @@ import java.util.Map;
 /**
  * @author code4crafter@gmail.com
  */
-@Controller("spider")
+@Controller
 @RequestMapping("spider")
 public class SpiderController {
 
+    @Autowired
+    private Worker worker;
+
     @RequestMapping("create")
     @ResponseBody
-    public Map<String, Object> create() {
+    public Map<String, Object> create(@RequestParam("id") String id) {
         HashMap<String, Object> map = new HashMap<String, Object>();
         map.put("code", 200);
         return map;
     }
+
 }

webmagic-core/src/main/java/us/codecraft/webmagic/selector/Html.java

@@ -23,7 +23,7 @@ public class Html extends PlainText {
      */
     private Document document;
 
-    private boolean init = false;
+    private boolean needInitCache = true;
 
     public Html(List<String> strings) {
         super(strings);
@@ -33,12 +33,22 @@ public class Html extends PlainText {
         super(text);
     }
 
+    public Html(List<String> strings, boolean needInitCache) {
+        super(strings);
+        this.needInitCache = needInitCache;
+    }
+
+    public Html(String text, boolean needInitCache) {
+        super(text);
+        this.needInitCache = needInitCache;
+    }
+
     /**
      * lazy init
      */
     private void initDocument() {
-        if (this.document == null && !init) {
-            init = true;
+        if (this.document == null && needInitCache) {
+            needInitCache = false;
             //just init once whether the parsing succeeds or not
             try {
                 this.document = Jsoup.parse(getText());
@@ -67,7 +77,7 @@ public class Html extends PlainText {
                 results.add(result);
             }
         }
-        return new Html(results);
+        return new Html(results, false);
     }
 
     @Override
@@ -78,7 +88,7 @@ public class Html extends PlainText {
             List<String> result = selector.selectList(string);
             results.addAll(result);
         }
-        return new Html(results);
+        return new Html(results, false);
     }
 
     @Override
@@ -95,9 +105,9 @@ public class Html extends PlainText {
 
     @Override
     public Selectable xpath(String xpath) {
-        XpathSelector xpathSelector = new XpathSelector(xpath);
+        XpathSelector xpathSelector = Selectors.xpath(xpath);
         if (document != null) {
-            return new Html(xpathSelector.selectList(document));
+            return new Html(xpathSelector.selectList(document), false);
         }
         return selectList(xpathSelector, strings);
     }
@@ -106,7 +116,7 @@ public class Html extends PlainText {
     public Selectable $(String selector) {
         CssSelector cssSelector = Selectors.$(selector);
         if (document != null) {
-            return new Html(cssSelector.selectList(document));
+            return new Html(cssSelector.selectList(document), false);
         }
         return selectList(cssSelector, strings);
     }
@@ -115,7 +125,7 @@ public class Html extends PlainText {
     public Selectable $(String selector, String attrName) {
         CssSelector cssSelector = Selectors.$(selector, attrName);
         if (document != null) {
-            return new Html(cssSelector.selectList(document));
+            return new Html(cssSelector.selectList(document), false);
         }
         return selectList(cssSelector, strings);
     }

webmagic-core/src/test/java/us/codecraft/webmagic/selector/SelectorTest.java

+package us.codecraft.webmagic.selector;
+
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author code4crafter@gmail.com
+ */
+public class SelectorTest {
+
+    private String html = "<div><a href='http://whatever.com/aaa'></a></div><div><a href='http://whatever.com/bbb'></a></div>";
+
+    @Test
+    public void testChain() throws Exception {
+        Html selectable = new Html(html);
+        List<String> linksWithoutChain = selectable.links().all();
+        Selectable xpath = selectable.xpath("//div");
+        List<String> linksWithChainFirstCall = xpath.links().all();
+        List<String> linksWithChainSecondCall = xpath.links().all();
+        assertThat(linksWithoutChain).hasSameSizeAs(linksWithChainFirstCall);
+        assertThat(linksWithChainFirstCall).hasSameSizeAs(linksWithChainSecondCall);
+    }
+}