BUG 2138: Introduce prefix based shards into ShardManager

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / shardstrategy / ShardStrategyFactory.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/shardstrategy/ShardStrategyFactory.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/shardstrategy/ShardStrategyFactory.java
index 210537925b151a0b0c140433d4d1f009fa90acf6..a97adc27308fdbc265d06e925a50a982f2fd22b7 100644 (file)
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/shardstrategy/ShardStrategyFactory.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/shardstrategy/ShardStrategyFactory.java
@@ -9,40 +9,53 @@
 package org.opendaylight.controller.cluster.datastore.shardstrategy;
 
 import com.google.common.base.Preconditions;
-import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
-
-import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
+import org.opendaylight.controller.cluster.datastore.config.Configuration;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
 
 public class ShardStrategyFactory {
-  private static final Map<String, ShardStrategy> moduleNameToStrategyMap = new ConcurrentHashMap();
+    private static final String UNKNOWN_MODULE_NAME = "unknown";
 
-  private static final String UNKNOWN_MODULE_NAME = "unknown";
+    private final Configuration configuration;
 
-  public static ShardStrategy getStrategy(InstanceIdentifier path){
-    Preconditions.checkNotNull(path, "path should not be null");
+    public ShardStrategyFactory(final Configuration configuration) {
+        Preconditions.checkState(configuration != null, "configuration should not be missing");
+        this.configuration = configuration;
+    }
 
-    String moduleName = getModuleName(path);
-    ShardStrategy shardStrategy = moduleNameToStrategyMap.get(moduleName);
-    if(shardStrategy == null){
-      return new DefaultShardStrategy();
+    public ShardStrategy getStrategy(final YangInstanceIdentifier path) {
+        Preconditions.checkNotNull(path, "path should not be null");
+
+        // try with the legacy module based shard mapping
+        final String moduleName = getModuleName(path);
+        final ShardStrategy shardStrategy = configuration.getStrategyForModule(moduleName);
+        if (shardStrategy == null) {
+            // retry with prefix based sharding
+            final ShardStrategy strategyForPrefix = configuration.getStrategyForPrefix(path);
+            if (strategyForPrefix == null) {
+                return DefaultShardStrategy.getInstance();
+            }
+            return strategyForPrefix;
+        }
+
+        return shardStrategy;
     }
 
-    return shardStrategy;
-  }
+    public static ShardStrategy newShardStrategyInstance(String moduleName, String strategyName,
+            Configuration configuration) {
+        if (ModuleShardStrategy.NAME.equals(strategyName)) {
+            return new ModuleShardStrategy(moduleName, configuration);
+        }
 
+        return DefaultShardStrategy.getInstance();
+    }
 
-  private static String getModuleName(InstanceIdentifier path){
-    return UNKNOWN_MODULE_NAME;
-  }
+    private String getModuleName(final YangInstanceIdentifier path) {
+        if (path.isEmpty()) {
+            return UNKNOWN_MODULE_NAME;
+        }
 
-  /**
-   * This is to be used in the future to register a custom shard strategy
-   *
-   * @param moduleName
-   * @param shardStrategy
-   */
-  public static void registerShardStrategy(String moduleName, ShardStrategy shardStrategy){
-    throw new UnsupportedOperationException("registering a custom shard strategy not supported yet");
-  }
+        String namespace = path.getPathArguments().iterator().next().getNodeType().getNamespace().toASCIIString();
+        String moduleName = configuration.getModuleNameFromNameSpace(namespace);
+        return moduleName != null ? moduleName : UNKNOWN_MODULE_NAME;
+    }
 }