SONAR-5375 Do not load source in issue tracking when there is zero issue

2 files changed, 22 insertions, 3 deletions

diff --git a/plugins/sonar-core-plugin/src/main/java/org/sonar/plugins/core/issue/IssueTracking.java b/plugins/sonar-core-plugin/src/main/java/org/sonar/plugins/core/issue/IssueTracking.java
index d5dbcccc83f..0e26a7904cc 100644
--- a/plugins/sonar-core-plugin/src/main/java/org/sonar/plugins/core/issue/IssueTracking.java
+++ b/plugins/sonar-core-plugin/src/main/java/org/sonar/plugins/core/issue/IssueTracking.java
@@ -60,6 +60,9 @@ public class IssueTracking implements BatchExtension {
   }
 
   private void setChecksumOnNewIssues(Collection<DefaultIssue> issues, SourceHashHolder sourceHashHolder) {
+    if (issues.isEmpty()) {
+      return;
+    }
     List<String> checksums = SourceChecksum.lineChecksumsOfFile(sourceHashHolder.getSource());
     for (DefaultIssue issue : issues) {
       issue.setChecksum(SourceChecksum.getChecksumForLine(checksums, issue.line()));
diff --git a/plugins/sonar-core-plugin/src/test/java/org/sonar/plugins/core/issue/IssueTrackingTest.java b/plugins/sonar-core-plugin/src/test/java/org/sonar/plugins/core/issue/IssueTrackingTest.java
index 761ca65210e..4b14f77c5b5 100644
--- a/plugins/sonar-core-plugin/src/test/java/org/sonar/plugins/core/issue/IssueTrackingTest.java
+++ b/plugins/sonar-core-plugin/src/test/java/org/sonar/plugins/core/issue/IssueTrackingTest.java
@@ -35,10 +35,12 @@ import org.sonar.core.issue.db.IssueDto;
 
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.Collections;
 
 import static com.google.common.collect.Lists.newArrayList;
 import static org.fest.assertions.Assertions.assertThat;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verifyZeroInteractions;
 import static org.mockito.Mockito.when;
 
 public class IssueTrackingTest {
@@ -313,16 +315,19 @@ public class IssueTrackingTest {
 
     IssueDto referenceIssue1 = newReferenceIssue("Avoid unused local variables such as 'j'.", 6, "squid", "AvoidCycle", "63c11570fc0a76434156be5f8138fa03");
     IssueDto referenceIssue2 = newReferenceIssue("Avoid unused private methods such as 'myMethod()'.", 13, "squid", "NullDeref", "ef23288705d1ef1e512448ace287586e");
-    IssueDto referenceIssue3 = newReferenceIssue("Method 'avoidUtilityClass' is not designed for extension - needs to be abstract, final or empty.", 9, "pmd", "UnusedLocalVariable", "ed5cdd046fda82727d6fedd1d8e3a310");
+    IssueDto referenceIssue3 = newReferenceIssue("Method 'avoidUtilityClass' is not designed for extension - needs to be abstract, final or empty.", 9, "pmd",
+      "UnusedLocalVariable", "ed5cdd046fda82727d6fedd1d8e3a310");
 
     // New issue
     DefaultIssue newIssue1 = newDefaultIssue("Avoid unused local variables such as 'msg'.", 18, RuleKey.of("squid", "AvoidCycle"), "a24254126be2bf1a9b9a8db43f633733");
     // Same as referenceIssue2
     DefaultIssue newIssue2 = newDefaultIssue("Avoid unused private methods such as 'myMethod()'.", 13, RuleKey.of("squid", "NullDeref"), "ef23288705d1ef1e512448ace287586e");
     // Same as referenceIssue3
-    DefaultIssue newIssue3 = newDefaultIssue("Method 'avoidUtilityClass' is not designed for extension - needs to be abstract, final or empty.", 9, RuleKey.of("pmd", "UnusedLocalVariable"), "ed5cdd046fda82727d6fedd1d8e3a310");
+    DefaultIssue newIssue3 = newDefaultIssue("Method 'avoidUtilityClass' is not designed for extension - needs to be abstract, final or empty.", 9,
+      RuleKey.of("pmd", "UnusedLocalVariable"), "ed5cdd046fda82727d6fedd1d8e3a310");
     // New issue
-    DefaultIssue newIssue4 = newDefaultIssue("Method 'newViolation' is not designed for extension - needs to be abstract, final or empty.", 17, RuleKey.of("pmd", "UnusedLocalVariable"), "7d58ac9040c27e4ca2f11a0269e251e2");
+    DefaultIssue newIssue4 = newDefaultIssue("Method 'newViolation' is not designed for extension - needs to be abstract, final or empty.", 17,
+      RuleKey.of("pmd", "UnusedLocalVariable"), "7d58ac9040c27e4ca2f11a0269e251e2");
     // Same as referenceIssue1
     DefaultIssue newIssue5 = newDefaultIssue("Avoid unused local variables such as 'j'.", 6, RuleKey.of("squid", "AvoidCycle"), "4432a2675ec3e1620daefe38386b51ef");
 
@@ -339,6 +344,17 @@ public class IssueTrackingTest {
     assertThat(result.matching(newIssue5)).isSameAs(referenceIssue1);
   }
 
+  @Test
+  public void dont_load_checksum_if_no_new_issue() throws Exception {
+    sourceHashHolder = mock(SourceHashHolder.class);
+
+    IssueDto referenceIssue = newReferenceIssue("2 branches need to be covered", null, "squid", "AvoidCycle", null);
+
+    tracking.track(sourceHashHolder, newArrayList(referenceIssue), Collections.<DefaultIssue>emptyList());
+
+    verifyZeroInteractions(lastSnapshots, sourceHashHolder);
+  }
+
   private static String load(String name) throws IOException {
     return Resources.toString(IssueTrackingTest.class.getResource("IssueTrackingTest/" + name + ".txt"), Charsets.UTF_8);
   }