adjust local cache directory logic

apollo-client/src/main/java/com/ctrip/framework/apollo/internals/LocalFileConfigRepository.java

@@ -25,6 +25,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Properties;
 
 /**
@@ -55,15 +57,29 @@ public class LocalFileConfigRepository extends AbstractConfigRepository
       Cat.logError(ex);
       throw new ApolloConfigException("Unable to load component!", ex);
     }
-    this.initialize(new File(ClassLoaderUtil.getClassPath() + CONFIG_DIR));
+    this.setLocalCacheDir(findLocalCacheDir());
   }
 
-  void initialize(File baseDir) {
+  void setLocalCacheDir(File baseDir) {
     m_baseDir = baseDir;
     this.checkLocalConfigCacheDir(m_baseDir);
     this.trySync();
   }
 
+  private File findLocalCacheDir() {
+    try {
+      String defaultCacheDir = m_configUtil.getDefaultLocalCacheDir();
+      Path path = Paths.get(defaultCacheDir);
+      if (Files.exists(path) && Files.isWritable(path)) {
+        return new File(defaultCacheDir, CONFIG_DIR);
+      }
+    } catch (Throwable ex) {
+      //ignore
+    }
+
+    return new File(ClassLoaderUtil.getClassPath(), CONFIG_DIR);
+  }
+
   @Override
   public Properties getConfig() {
     if (m_fileProperties == null) {
@@ -98,6 +114,13 @@ public class LocalFileConfigRepository extends AbstractConfigRepository
 
   @Override
   protected void sync() {
+    //sync with upstream immediately
+   boolean syncFromUpstreamResultSuccess = trySyncFromUpstream();
+
+    if (syncFromUpstreamResultSuccess) {
+      return;
+    }
+
     Transaction transaction = Cat.newTransaction("Apollo.ConfigService", "syncLocalConfig");
     Throwable exception = null;
     try {
@@ -113,28 +136,27 @@ public class LocalFileConfigRepository extends AbstractConfigRepository
       transaction.complete();
     }
 
-    //sync with fallback immediately
-    trySyncFromUpstream();
-
     if (m_fileProperties == null) {
       throw new ApolloConfigException(
           "Load config from local config failed!", exception);
     }
   }
 
-  private void trySyncFromUpstream() {
+  private boolean trySyncFromUpstream() {
     if (m_upstream == null) {
-      return;
+      return false;
     }
     try {
       Properties properties = m_upstream.getConfig();
       updateFileProperties(properties);
+      return true;
     } catch (Throwable ex) {
       Cat.logError(ex);
       logger
           .warn("Sync config from upstream repository {} failed, reason: {}", m_upstream.getClass(),
               ExceptionUtil.getDetailMessage(ex));
     }
+    return false;
   }
 
   private synchronized void updateFileProperties(Properties newProperties) {

apollo-client/src/main/java/com/ctrip/framework/apollo/util/ConfigUtil.java

@@ -179,4 +179,9 @@ public class ConfigUtil {
   public int getLongPollQPS() {
     return longPollQPS;
   }
+
+  public String getDefaultLocalCacheDir() {
+    //TODO call Framework Foundation to get the default local cache dir
+    return String.format("/opt/data/%s", getAppId());
+  }
 }

apollo-client/src/test/java/com/ctrip/framework/apollo/internals/LocalFileConfigRepositoryTest.java

@@ -93,7 +93,7 @@ public class LocalFileConfigRepositoryTest extends ComponentTestCase {
     createLocalCachePropertyFile(someProperties);
 
     LocalFileConfigRepository localRepo = new LocalFileConfigRepository(someNamespace);
-    localRepo.initialize(someBaseDir);
+    localRepo.setLocalCacheDir(someBaseDir);
     Properties properties = localRepo.getConfig();
 
     assertEquals(someValue, properties.getProperty(someKey));
@@ -109,7 +109,7 @@ public class LocalFileConfigRepositoryTest extends ComponentTestCase {
     Files.write(defaultKey + "=" + someValue, file, Charsets.UTF_8);
 
     LocalFileConfigRepository localRepo = new LocalFileConfigRepository(someNamespace);
-    localRepo.initialize(someBaseDir);
+    localRepo.setLocalCacheDir(someBaseDir);
 
     //when fallback is set, it will try to sync from it
     localRepo.setUpstreamRepository(fallbackRepo);
@@ -124,7 +124,7 @@ public class LocalFileConfigRepositoryTest extends ComponentTestCase {
     LocalFileConfigRepository
         localFileConfigRepository =
         new LocalFileConfigRepository(someNamespace);
-    localFileConfigRepository.initialize(someBaseDir);
+    localFileConfigRepository.setLocalCacheDir(someBaseDir);
 
     localFileConfigRepository.setUpstreamRepository(fallbackRepo);
 
@@ -139,7 +139,7 @@ public class LocalFileConfigRepositoryTest extends ComponentTestCase {
   public void testLoadConfigWithNoLocalFileMultipleTimes() throws Exception {
     LocalFileConfigRepository localRepo =
         new LocalFileConfigRepository(someNamespace);
-    localRepo.initialize(someBaseDir);
+    localRepo.setLocalCacheDir(someBaseDir);
 
     localRepo.setUpstreamRepository(fallbackRepo);
 
@@ -148,7 +148,7 @@ public class LocalFileConfigRepositoryTest extends ComponentTestCase {
     LocalFileConfigRepository
         anotherLocalRepoWithNoFallback =
         new LocalFileConfigRepository(someNamespace);
-    anotherLocalRepoWithNoFallback.initialize(someBaseDir);
+    anotherLocalRepoWithNoFallback.setLocalCacheDir(someBaseDir);
 
     Properties anotherProperties = anotherLocalRepoWithNoFallback.getConfig();
 
@@ -164,7 +164,7 @@ public class LocalFileConfigRepositoryTest extends ComponentTestCase {
 
     LocalFileConfigRepository localFileConfigRepository =
         new LocalFileConfigRepository(someNamespace);
-    localFileConfigRepository.initialize(someBaseDir);
+    localFileConfigRepository.setLocalCacheDir(someBaseDir);
     localFileConfigRepository.setUpstreamRepository(fallbackRepo);
     localFileConfigRepository.addChangeListener(someListener);