[GitHub] [servicecomb-java-chassis] wujimin commented on a change in pull request #1794: [SCB-1947] define Filter and filter chain

[GitBox <gi...@apache.org>]

wujimin commented on a change in pull request #1794:
URL: https://github.com/apache/servicecomb-java-chassis/pull/1794#discussion_r432513092



##########
File path: core/src/main/java/org/apache/servicecomb/core/filter/FilterNode.java
##########
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.servicecomb.core.filter;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+
+import org.apache.servicecomb.core.Invocation;
+import org.apache.servicecomb.foundation.common.utils.AsyncUtils;
+import org.apache.servicecomb.swagger.invocation.Response;
+
+public class FilterNode {
+  public static FilterNode buildChain(Filter... filters) {
+    return buildChain(Arrays.asList(filters));
+  }
+
+  public static FilterNode buildChain(List<Filter> filters) {
+    List<FilterNode> filterNodes = filters.stream()
+        .map(FilterNode::new)
+        .collect(Collectors.toList());
+
+    for (int idx = 0; idx < filterNodes.size() - 1; idx++) {
+      filterNodes.get(idx).setNextNode(filterNodes.get(idx + 1));
+    }
+
+    return filterNodes.get(0);
+  }
+
+  private final Filter filter;
+
+  private FilterNode nextNode;
+
+  public FilterNode(Filter filter) {
+    this.filter = filter;
+  }
+
+  public void setNextNode(FilterNode nextNode) {

Review comment:
       done




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