Integration of TOS: Add RawFS

hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/RawFS.java

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+/*
+ * 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.hadoop.fs.tosfs;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.DelegateToFileSystem;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+/**
+ * The implementation class of the raw AbstractFileSystem. If you want to use object storage as
+ * YARN’s resource storage dir via the fs.defaultFS configuration property in Hadoop’s
+ * core-site.xml, you should add this configuration to Hadoop's core-site.xml.
+ * <pre>
+ *  fs.AbstractFileSystem.{scheme}.impl=io.proton.fs.RawFS.
+ * </pre>
+ */
+public class RawFS extends DelegateToFileSystem {
+  private static final int TOS_DEFAULT_PORT = -1;
+
+  public RawFS(URI uri, Configuration conf) throws IOException, URISyntaxException {
+    super(uri, new RawFileSystem(), conf, uri.getScheme(), false);
+  }
+
+  @Override
+  public int getUriDefaultPort() {
+    return TOS_DEFAULT_PORT;
+  }
+}