refactor into a service

src/main/java/com/commafeed/backend/service/FeedEntryFilteringService.java

@@ -1,14 +1,13 @@
-package com.commafeed.backend.feed;
+package com.commafeed.backend.service;
 
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
-import lombok.RequiredArgsConstructor;
-
 import org.apache.commons.jexl2.JexlContext;
 import org.apache.commons.jexl2.JexlEngine;
 import org.apache.commons.jexl2.JexlException;
@@ -25,8 +24,7 @@ import org.jsoup.Jsoup;
 
 import com.commafeed.backend.model.FeedEntry;
 
-@RequiredArgsConstructor
-public class FeedEntryFilter {
+public class FeedEntryFilteringService {
 
 	private static final JexlEngine ENGINE = initEngine();
 
@@ -69,9 +67,9 @@ public class FeedEntryFilter {
 		return engine;
 	}
 
-	private final String filter;
+	private ExecutorService executor = Executors.newCachedThreadPool();
 
-	public boolean matchesEntry(FeedEntry entry) throws FeedEntryFilterException {
+	public boolean filterMatchesEntry(String filter, FeedEntry entry) throws FeedEntryFilterException {
 		if (StringUtils.isBlank(filter)) {
 			return true;
 		}
@@ -90,7 +88,7 @@ public class FeedEntryFilter {
 		context.set("url", entry.getUrl().toLowerCase());
 
 		Callable<Object> callable = script.callable(context);
-		Future<Object> future = Executors.newFixedThreadPool(1).submit(callable);
+		Future<Object> future = executor.submit(callable);
 		Object result = null;
 		try {
 			result = future.get(500, TimeUnit.MILLISECONDS);

src/main/java/com/commafeed/backend/service/FeedUpdateService.java

@@ -13,13 +13,12 @@ import org.apache.commons.codec.digest.DigestUtils;
 
 import com.commafeed.backend.dao.FeedEntryDAO;
 import com.commafeed.backend.dao.FeedEntryStatusDAO;
-import com.commafeed.backend.feed.FeedEntryFilter;
-import com.commafeed.backend.feed.FeedEntryFilter.FeedEntryFilterException;
 import com.commafeed.backend.model.Feed;
 import com.commafeed.backend.model.FeedEntry;
 import com.commafeed.backend.model.FeedEntryContent;
 import com.commafeed.backend.model.FeedEntryStatus;
 import com.commafeed.backend.model.FeedSubscription;
+import com.commafeed.backend.service.FeedEntryFilteringService.FeedEntryFilterException;
 
 @Slf4j
 @RequiredArgsConstructor(onConstructor = @__({ @Inject }))
@@ -29,6 +28,7 @@ public class FeedUpdateService {
 	private final FeedEntryDAO feedEntryDAO;
 	private final FeedEntryStatusDAO feedEntryStatusDAO;
 	private final FeedEntryContentService feedEntryContentService;
+	private final FeedEntryFilteringService feedEntryFilteringService;
 
 	/**
 	 * this is NOT thread-safe
@@ -49,10 +49,9 @@ public class FeedUpdateService {
 
 		// if filter does not match the entry, mark it as read
 		for (FeedSubscription sub : subscriptions) {
-			FeedEntryFilter filter = new FeedEntryFilter(sub.getFilter());
 			boolean matches = true;
 			try {
-				matches = filter.matchesEntry(entry);
+				matches = feedEntryFilteringService.filterMatchesEntry(sub.getFilter(), entry);
 			} catch (FeedEntryFilterException e) {
 				log.error("could not evaluate filter {}", sub.getFilter(), e);
 			}

src/main/java/com/commafeed/frontend/resource/FeedREST.java

@@ -44,8 +44,6 @@ import com.commafeed.backend.cache.CacheService;
 import com.commafeed.backend.dao.FeedCategoryDAO;
 import com.commafeed.backend.dao.FeedEntryStatusDAO;
 import com.commafeed.backend.dao.FeedSubscriptionDAO;
-import com.commafeed.backend.feed.FeedEntryFilter;
-import com.commafeed.backend.feed.FeedEntryFilter.FeedEntryFilterException;
 import com.commafeed.backend.feed.FeedEntryKeyword;
 import com.commafeed.backend.feed.FeedFetcher;
 import com.commafeed.backend.feed.FeedQueues;
@@ -62,6 +60,8 @@ import com.commafeed.backend.model.UserSettings.ReadingMode;
 import com.commafeed.backend.model.UserSettings.ReadingOrder;
 import com.commafeed.backend.opml.OPMLExporter;
 import com.commafeed.backend.opml.OPMLImporter;
+import com.commafeed.backend.service.FeedEntryFilteringService;
+import com.commafeed.backend.service.FeedEntryFilteringService.FeedEntryFilterException;
 import com.commafeed.backend.service.FeedEntryService;
 import com.commafeed.backend.service.FeedService;
 import com.commafeed.backend.service.FeedSubscriptionService;
@@ -119,6 +119,7 @@ public class FeedREST {
 	private final FeedService feedService;
 	private final FeedEntryService feedEntryService;
 	private final FeedSubscriptionService feedSubscriptionService;
+	private final FeedEntryFilteringService feedEntryFilteringService;
 	private final FeedQueues queues;
 	private final OPMLImporter opmlImporter;
 	private final OPMLExporter opmlExporter;
@@ -440,7 +441,7 @@ public class FeedREST {
 		Preconditions.checkNotNull(req.getId());
 
 		try {
-			new FeedEntryFilter(req.getFilter()).matchesEntry(TEST_ENTRY);
+			feedEntryFilteringService.filterMatchesEntry(req.getFilter(), TEST_ENTRY);
 		} catch (FeedEntryFilterException e) {
 			Throwable root = Throwables.getRootCause(e);
 			return Response.status(Status.BAD_REQUEST).entity(root.getMessage()).build();

src/test/java/com/commafeed/backend/service/FeedEntryFilteringServiceTest.java

@@ -1,20 +1,24 @@
-package com.commafeed.backend.feed;
+package com.commafeed.backend.service;
 
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
-import com.commafeed.backend.feed.FeedEntryFilter.FeedEntryFilterException;
 import com.commafeed.backend.model.FeedEntry;
 import com.commafeed.backend.model.FeedEntryContent;
+import com.commafeed.backend.service.FeedEntryFilteringService.FeedEntryFilterException;
 
-public class FeedEntryFilterTest {
+public class FeedEntryFilteringServiceTest {
+
+	private FeedEntryFilteringService service;
 
 	private FeedEntry entry;
 	private FeedEntryContent content;
 
 	@Before
 	public void init() {
+		service = new FeedEntryFilteringService();
+
 		entry = new FeedEntry();
 		entry.setUrl("https://github.com/Athou/commafeed");
 
@@ -28,44 +32,37 @@ public class FeedEntryFilterTest {
 
 	@Test
 	public void emptyFilterMatchesFilter() throws FeedEntryFilterException {
-		FeedEntryFilter filter = new FeedEntryFilter(null);
-		Assert.assertTrue(filter.matchesEntry(entry));
+		Assert.assertTrue(service.filterMatchesEntry(null, entry));
 	}
 
 	@Test
 	public void blankFilterMatchesFilter() throws FeedEntryFilterException {
-		FeedEntryFilter filter = new FeedEntryFilter("");
-		Assert.assertTrue(filter.matchesEntry(entry));
+		Assert.assertTrue(service.filterMatchesEntry("", entry));
 	}
 
 	@Test
 	public void simpleExpression() throws FeedEntryFilterException {
-		FeedEntryFilter filter = new FeedEntryFilter("author eq 'athou'");
-		Assert.assertTrue(filter.matchesEntry(entry));
+		Assert.assertTrue(service.filterMatchesEntry("author eq 'athou'", entry));
 	}
 
 	@Test(expected = FeedEntryFilterException.class)
 	public void newIsDisabled() throws FeedEntryFilterException {
-		FeedEntryFilter filter = new FeedEntryFilter("null eq new ('java.lang.String', 'athou')");
-		filter.matchesEntry(entry);
+		service.filterMatchesEntry("null eq new ('java.lang.String', 'athou')", entry);
 	}
 
 	@Test(expected = FeedEntryFilterException.class)
 	public void getClassMethodIsDisabled() throws FeedEntryFilterException {
-		FeedEntryFilter filter = new FeedEntryFilter("null eq ''.getClass()");
-		filter.matchesEntry(entry);
+		service.filterMatchesEntry("null eq ''.getClass()", entry);
 	}
 
 	@Test
 	public void dotClassIsDisabled() throws FeedEntryFilterException {
-		FeedEntryFilter filter = new FeedEntryFilter("null eq ''.class");
-		Assert.assertTrue(filter.matchesEntry(entry));
+		Assert.assertTrue(service.filterMatchesEntry("null eq ''.class", entry));
 	}
 
 	@Test(expected = FeedEntryFilterException.class)
 	public void cannotLoopForever() throws FeedEntryFilterException {
-		FeedEntryFilter filter = new FeedEntryFilter("while(true) {}");
-		filter.matchesEntry(entry);
+		service.filterMatchesEntry("while(true) {}", entry);
 	}
 
 }