Integration of TOS: Add TosFileSystem.

hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/TosFileSystem.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.FileSystem;
+import org.apache.hadoop.fs.tosfs.object.tos.TOS;
+import org.apache.hadoop.util.Preconditions;
+
+import java.io.IOException;
+import java.net.URI;
+
+public class TosFileSystem extends RawFileSystem {
+  @Override
+  public void initialize(URI uri, Configuration conf) throws IOException {
+    Preconditions.checkNotNull(uri);
+
+    String scheme = uri.getScheme();
+    if (scheme == null || scheme.isEmpty()) {
+      scheme = FileSystem.getDefaultUri(conf).getScheme();
+    }
+    Preconditions.checkArgument(scheme.equals(TOS.TOS_SCHEME),
+        "Unsupported scheme %s, expected scheme is %s.", scheme, TOS.TOS_SCHEME);
+
+    super.initialize(uri, conf);
+  }
+}

hadoop-cloud-storage-project/hadoop-tos/src/test/java/org/apache/hadoop/fs/tosfs/TestTosFileSystem.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.CommonConfigurationKeys;
+import org.apache.hadoop.fs.tosfs.util.TestUtility;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import static org.junit.Assert.assertThrows;
+
+public class TestTosFileSystem {
+  @Test
+  public void testUriVerification() throws URISyntaxException, IOException {
+    Configuration conf = new Configuration(false);
+    conf.set(CommonConfigurationKeys.FS_DEFAULT_NAME_KEY, "hdfs://cluster-0/");
+
+    TosFileSystem tfs = new TosFileSystem();
+    assertThrows("Expect invalid uri error.", IllegalArgumentException.class,
+        () -> tfs.initialize(new URI("hdfs://cluster/"), conf));
+    assertThrows("Expect invalid uri error.", IllegalArgumentException.class,
+        () -> tfs.initialize(new URI("/path"), conf));
+    tfs.initialize(new URI(String.format("tos://%s/", TestUtility.bucket())), conf);
+  }
+}