[GitHub] eolivelli commented on a change in pull request #266: Issue 265: Add persistable bookie status

[gi...@git.apache.org]

eolivelli commented on a change in pull request #266: Issue 265: Add persistable bookie status
URL: https://github.com/apache/bookkeeper/pull/266#discussion_r128501094
 
 

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 File path: bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/BookieStatus.java
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 @@ -0,0 +1,246 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.bookkeeper.bookie;
+
+import static com.google.common.base.Charsets.UTF_8;
+import static org.apache.bookkeeper.util.BookKeeperConstants.BOOKIE_STATUS_FILENAME;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.util.List;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The status object represents the current status of a bookie instance.
+ */
+public class BookieStatus {
+    static Logger LOG = LoggerFactory.getLogger(BookieStatus.class);
+    static final int CURRENT_STATUS_LAYOUT_VERSION = 1;
+
+    enum BookieMode {
+        READ_ONLY,
+        READ_WRITE;
+    }
+
+    private final static long INVALID_UPDATE_TIME = -1;
+
+    private int layoutVersion;
+    private long lastUpdateTime;
+    private BookieMode bookieMode;
+
+
+    BookieStatus() {
+        this.bookieMode = BookieMode.READ_WRITE;
+        this.layoutVersion = CURRENT_STATUS_LAYOUT_VERSION;
+        this.lastUpdateTime = INVALID_UPDATE_TIME;
+    }
+
+    private synchronized BookieMode getBookieMode() {
+        return bookieMode;
+    }
+
+    public synchronized boolean isInWritable() {
+        return bookieMode.equals(BookieMode.READ_WRITE);
+    }
+
+    synchronized boolean setToWritableMode() {
+        if (!bookieMode.equals(BookieMode.READ_WRITE)) {
+            bookieMode = BookieMode.READ_WRITE;
+            this.lastUpdateTime = System.currentTimeMillis();
+            return true;
+        }
+        return false;
+    }
+
+    synchronized boolean isInReadOnlyMode() {
+        return bookieMode.equals(BookieMode.READ_ONLY);
 
 Review comment:
   Can't we use '==' for enums ?
 
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