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From te...@apache.org
Subject hbase git commit: HBASE-12650 Move ServerName to hbase-common module
Date Mon, 08 Dec 2014 14:58:58 GMT
Repository: hbase
Updated Branches:
  refs/heads/master 87e441400 -> 11864c60c


HBASE-12650 Move ServerName to hbase-common module


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/11864c60
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/11864c60
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/11864c60

Branch: refs/heads/master
Commit: 11864c60c721400bfca260143e9c92273893bd3b
Parents: 87e4414
Author: tedyu <yuzhihong@gmail.com>
Authored: Mon Dec 8 06:58:41 2014 -0800
Committer: tedyu <yuzhihong@gmail.com>
Committed: Mon Dec 8 06:58:41 2014 -0800

----------------------------------------------------------------------
 .../org/apache/hadoop/hbase/ServerName.java     | 402 +++++++++++++++++++
 .../exceptions/DeserializationException.java    |  43 ++
 .../hadoop/hbase/exceptions/HBaseException.java |  44 ++
 .../hadoop/hbase/protobuf/ProtobufMagic.java    |  90 +++++
 4 files changed, 579 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/11864c60/hbase-common/src/main/java/org/apache/hadoop/hbase/ServerName.java
----------------------------------------------------------------------
diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/ServerName.java b/hbase-common/src/main/java/org/apache/hadoop/hbase/ServerName.java
new file mode 100644
index 0000000..f6f89b4
--- /dev/null
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/ServerName.java
@@ -0,0 +1,402 @@
+/**
+ *
+ * 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.hbase;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+import org.apache.hadoop.hbase.classification.InterfaceStability;
+import org.apache.hadoop.hbase.exceptions.DeserializationException;
+import org.apache.hadoop.hbase.protobuf.ProtobufMagic;
+import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos;
+import org.apache.hadoop.hbase.util.Addressing;
+import org.apache.hadoop.hbase.util.Bytes;
+
+import com.google.common.net.InetAddresses;
+import com.google.protobuf.InvalidProtocolBufferException;
+
+/**
+ * Instance of an HBase ServerName.
+ * A server name is used uniquely identifying a server instance in a cluster and is made
+ * of the combination of hostname, port, and startcode.  The startcode distingushes restarted
+ * servers on same hostname and port (startcode is usually timestamp of server startup).
The
+ * {@link #toString()} format of ServerName is safe to use in the  filesystem and as znode
name
+ * up in ZooKeeper.  Its format is:
+ * <code>&lt;hostname> '{@link #SERVERNAME_SEPARATOR}' &lt;port> '{@link
#SERVERNAME_SEPARATOR}' &lt;startcode></code>.
+ * For example, if hostname is <code>www.example.org</code>, port is <code>1234</code>,
+ * and the startcode for the regionserver is <code>1212121212</code>, then
+ * the {@link #toString()} would be <code>www.example.org,1234,1212121212</code>.
+ * 
+ * <p>You can obtain a versioned serialized form of this class by calling
+ * {@link #getVersionedBytes()}.  To deserialize, call {@link #parseVersionedServerName(byte[])}
+ * 
+ * <p>Immutable.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public class ServerName implements Comparable<ServerName>, Serializable {
+  private static final long serialVersionUID = 1367463982557264981L;
+
+  /**
+   * Version for this class.
+   * Its a short rather than a byte so I can for sure distinguish between this
+   * version of this class and the version previous to this which did not have
+   * a version.
+   */
+  private static final short VERSION = 0;
+  static final byte [] VERSION_BYTES = Bytes.toBytes(VERSION);
+
+  /**
+   * What to use if no startcode supplied.
+   */
+  public static final int NON_STARTCODE = -1;
+
+  /**
+   * This character is used as separator between server hostname, port and
+   * startcode.
+   */
+  public static final String SERVERNAME_SEPARATOR = ",";
+
+  public static final Pattern SERVERNAME_PATTERN =
+    Pattern.compile("[^" + SERVERNAME_SEPARATOR + "]+" +
+      SERVERNAME_SEPARATOR + Addressing.VALID_PORT_REGEX +
+      SERVERNAME_SEPARATOR + Addressing.VALID_PORT_REGEX + "$");
+
+  /**
+   * What to use if server name is unknown.
+   */
+  public static final String UNKNOWN_SERVERNAME = "#unknown#";
+
+  private final String servername;
+  private final String hostnameOnly;
+  private final int port;
+  private final long startcode;
+
+  /**
+   * Cached versioned bytes of this ServerName instance.
+   * @see #getVersionedBytes()
+   */
+  private byte [] bytes;
+  public static final List<ServerName> EMPTY_SERVER_LIST = new ArrayList<ServerName>(0);
+
+  private ServerName(final String hostname, final int port, final long startcode) {
+    // Drop the domain is there is one; no need of it in a local cluster.  With it, we get
long
+    // unwieldy names.
+    this.hostnameOnly = hostname;
+    this.port = port;
+    this.startcode = startcode;
+    this.servername = getServerName(this.hostnameOnly, port, startcode);
+  }
+
+  /**
+   * @param hostname
+   * @return hostname minus the domain, if there is one (will do pass-through on ip addresses)
+   */
+  static String getHostNameMinusDomain(final String hostname) {
+    if (InetAddresses.isInetAddress(hostname)) return hostname;
+    String [] parts = hostname.split("\\.");
+    if (parts == null || parts.length == 0) return hostname;
+    return parts[0];
+  }
+
+  private ServerName(final String serverName) {
+    this(parseHostname(serverName), parsePort(serverName),
+      parseStartcode(serverName));
+  }
+
+  private ServerName(final String hostAndPort, final long startCode) {
+    this(Addressing.parseHostname(hostAndPort),
+      Addressing.parsePort(hostAndPort), startCode);
+  }
+
+  public static String parseHostname(final String serverName) {
+    if (serverName == null || serverName.length() <= 0) {
+      throw new IllegalArgumentException("Passed hostname is null or empty");
+    }
+    if (!Character.isLetterOrDigit(serverName.charAt(0))) {
+      throw new IllegalArgumentException("Bad passed hostname, serverName=" + serverName);
+    }
+    int index = serverName.indexOf(SERVERNAME_SEPARATOR);
+    return serverName.substring(0, index);
+  }
+
+  public static int parsePort(final String serverName) {
+    String [] split = serverName.split(SERVERNAME_SEPARATOR);
+    return Integer.parseInt(split[1]);
+  }
+
+  public static long parseStartcode(final String serverName) {
+    int index = serverName.lastIndexOf(SERVERNAME_SEPARATOR);
+    return Long.parseLong(serverName.substring(index + 1));
+  }
+
+  /**
+   * Retrieve an instance of ServerName.
+   * Callers should use the equals method to compare returned instances, though we may return
+   * a shared immutable object as an internal optimization.
+   */
+  public static ServerName valueOf(final String hostname, final int port, final long startcode)
{
+    return new ServerName(hostname, port, startcode);
+  }
+
+  /**
+   * Retrieve an instance of ServerName.
+   * Callers should use the equals method to compare returned instances, though we may return
+   * a shared immutable object as an internal optimization.
+   */
+  public static ServerName valueOf(final String serverName) {
+    return new ServerName(serverName);
+  }
+
+  /**
+   * Retrieve an instance of ServerName.
+   * Callers should use the equals method to compare returned instances, though we may return
+   * a shared immutable object as an internal optimization.
+   */
+  public static ServerName valueOf(final String hostAndPort, final long startCode) {
+    return new ServerName(hostAndPort, startCode);
+  }
+
+  @Override
+  public String toString() {
+    return getServerName();
+  }
+
+  /**
+   * @return Return a SHORT version of {@link ServerName#toString()}, one that has the host
only,
+   * minus the domain, and the port only -- no start code; the String is for us internally
mostly
+   * tying threads to their server.  Not for external use.  It is lossy and will not work
in
+   * in compares, etc.
+   */
+  public String toShortString() {
+    return Addressing.createHostAndPortStr(getHostNameMinusDomain(this.hostnameOnly), this.port);
+  }
+
+  /**
+   * @return {@link #getServerName()} as bytes with a short-sized prefix with
+   * the ServerName#VERSION of this class.
+   */
+  public synchronized byte [] getVersionedBytes() {
+    if (this.bytes == null) {
+      this.bytes = Bytes.add(VERSION_BYTES, Bytes.toBytes(getServerName()));
+    }
+    return this.bytes;
+  }
+
+  public String getServerName() {
+    return servername;
+  }
+
+  public String getHostname() {
+    return hostnameOnly;
+  }
+
+  public int getPort() {
+    return port;
+  }
+
+  public long getStartcode() {
+    return startcode;
+  }
+
+  /**
+   * For internal use only.
+   * @param hostName
+   * @param port
+   * @param startcode
+   * @return Server name made of the concatenation of hostname, port and
+   * startcode formatted as <code>&lt;hostname> ',' &lt;port> ',' &lt;startcode></code>
+   */
+  static String getServerName(String hostName, int port, long startcode) {
+    final StringBuilder name = new StringBuilder(hostName.length() + 1 + 5 + 1 + 13);
+    name.append(hostName);
+    name.append(SERVERNAME_SEPARATOR);
+    name.append(port);
+    name.append(SERVERNAME_SEPARATOR);
+    name.append(startcode);
+    return name.toString();
+  }
+
+  /**
+   * @param hostAndPort String in form of &lt;hostname> ':' &lt;port>
+   * @param startcode
+   * @return Server name made of the concatenation of hostname, port and
+   * startcode formatted as <code>&lt;hostname> ',' &lt;port> ',' &lt;startcode></code>
+   */
+  public static String getServerName(final String hostAndPort,
+      final long startcode) {
+    int index = hostAndPort.indexOf(":");
+    if (index <= 0) throw new IllegalArgumentException("Expected <hostname> ':'
<port>");
+    return getServerName(hostAndPort.substring(0, index),
+      Integer.parseInt(hostAndPort.substring(index + 1)), startcode);
+  }
+
+  /**
+   * @return Hostname and port formatted as described at
+   * {@link Addressing#createHostAndPortStr(String, int)}
+   */
+  public String getHostAndPort() {
+    return Addressing.createHostAndPortStr(this.hostnameOnly, this.port);
+  }
+
+  /**
+   * @param serverName ServerName in form specified by {@link #getServerName()}
+   * @return The server start code parsed from <code>servername</code>
+   */
+  public static long getServerStartcodeFromServerName(final String serverName) {
+    int index = serverName.lastIndexOf(SERVERNAME_SEPARATOR);
+    return Long.parseLong(serverName.substring(index + 1));
+  }
+
+  /**
+   * Utility method to excise the start code from a server name
+   * @param inServerName full server name
+   * @return server name less its start code
+   */
+  public static String getServerNameLessStartCode(String inServerName) {
+    if (inServerName != null && inServerName.length() > 0) {
+      int index = inServerName.lastIndexOf(SERVERNAME_SEPARATOR);
+      if (index > 0) {
+        return inServerName.substring(0, index);
+      }
+    }
+    return inServerName;
+  }
+
+  @Override
+  public int compareTo(ServerName other) {
+    int compare = this.getHostname().compareToIgnoreCase(other.getHostname());
+    if (compare != 0) return compare;
+    compare = this.getPort() - other.getPort();
+    if (compare != 0) return compare;
+    return (int)(this.getStartcode() - other.getStartcode());
+  }
+
+  @Override
+  public int hashCode() {
+    return getServerName().hashCode();
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o == null) return false;
+    if (!(o instanceof ServerName)) return false;
+    return this.compareTo((ServerName)o) == 0;
+  }
+
+  /**
+   * @param left
+   * @param right
+   * @return True if <code>other</code> has same hostname and port.
+   */
+  public static boolean isSameHostnameAndPort(final ServerName left,
+      final ServerName right) {
+    if (left == null) return false;
+    if (right == null) return false;
+    return left.getHostname().equals(right.getHostname()) &&
+      left.getPort() == right.getPort();
+  }
+
+  /**
+   * Use this method instantiating a {@link ServerName} from bytes
+   * gotten from a call to {@link #getVersionedBytes()}.  Will take care of the
+   * case where bytes were written by an earlier version of hbase.
+   * @param versionedBytes Pass bytes gotten from a call to {@link #getVersionedBytes()}
+   * @return A ServerName instance.
+   * @see #getVersionedBytes()
+   */
+  public static ServerName parseVersionedServerName(final byte [] versionedBytes) {
+    // Version is a short.
+    short version = Bytes.toShort(versionedBytes);
+    if (version == VERSION) {
+      int length = versionedBytes.length - Bytes.SIZEOF_SHORT;
+      return valueOf(Bytes.toString(versionedBytes, Bytes.SIZEOF_SHORT, length));
+    }
+    // Presume the bytes were written with an old version of hbase and that the
+    // bytes are actually a String of the form "'<hostname>' ':' '<port>'".
+    return valueOf(Bytes.toString(versionedBytes), NON_STARTCODE);
+  }
+
+  /**
+   * @param str Either an instance of {@link ServerName#toString()} or a
+   * "'<hostname>' ':' '<port>'".
+   * @return A ServerName instance.
+   */
+  public static ServerName parseServerName(final String str) {
+    return SERVERNAME_PATTERN.matcher(str).matches()? valueOf(str) :
+        valueOf(str, NON_STARTCODE);
+  }
+
+
+  /**
+   * @return true if the String follows the pattern of {@link ServerName#toString()}, false
+   *  otherwise.
+   */
+  public static boolean isFullServerName(final String str){
+    if (str == null ||str.isEmpty()) return false;
+    return SERVERNAME_PATTERN.matcher(str).matches();
+  }
+
+  /**
+   * Get a ServerName from the passed in data bytes.
+   * @param data Data with a serialize server name in it; can handle the old style
+   * servername where servername was host and port.  Works too with data that
+   * begins w/ the pb 'PBUF' magic and that is then followed by a protobuf that
+   * has a serialized {@link ServerName} in it.
+   * @return Returns null if <code>data</code> is null else converts passed data
+   * to a ServerName instance.
+   * @throws DeserializationException 
+   */
+  public static ServerName parseFrom(final byte [] data) throws DeserializationException
{
+    if (data == null || data.length <= 0) return null;
+    if (ProtobufMagic.isPBMagicPrefix(data)) {
+      int prefixLen = ProtobufMagic.lengthOfPBMagic();
+      try {
+        ZooKeeperProtos.Master rss =
+          ZooKeeperProtos.Master.PARSER.parseFrom(data, prefixLen, data.length - prefixLen);
+        org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.ServerName sn = rss.getMaster();
+        return valueOf(sn.getHostName(), sn.getPort(), sn.getStartCode());
+      } catch (InvalidProtocolBufferException e) {
+        // A failed parse of the znode is pretty catastrophic. Rather than loop
+        // retrying hoping the bad bytes will changes, and rather than change
+        // the signature on this method to add an IOE which will send ripples all
+        // over the code base, throw a RuntimeException.  This should "never" happen.
+        // Fail fast if it does.
+        throw new DeserializationException(e);
+      }
+    }
+    // The str returned could be old style -- pre hbase-1502 -- which was
+    // hostname and port seperated by a colon rather than hostname, port and
+    // startcode delimited by a ','.
+    String str = Bytes.toString(data);
+    int index = str.indexOf(ServerName.SERVERNAME_SEPARATOR);
+    if (index != -1) {
+      // Presume its ServerName serialized with versioned bytes.
+      return ServerName.parseVersionedServerName(data);
+    }
+    // Presume it a hostname:port format.
+    String hostname = Addressing.parseHostname(str);
+    int port = Addressing.parsePort(str);
+    return valueOf(hostname, port, -1L);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/11864c60/hbase-common/src/main/java/org/apache/hadoop/hbase/exceptions/DeserializationException.java
----------------------------------------------------------------------
diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/exceptions/DeserializationException.java
b/hbase-common/src/main/java/org/apache/hadoop/hbase/exceptions/DeserializationException.java
new file mode 100644
index 0000000..0ce0219
--- /dev/null
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/exceptions/DeserializationException.java
@@ -0,0 +1,43 @@
+/**
+ * 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.hbase.exceptions;
+
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+
+/**
+ * Failed deserialization.
+ */
+@InterfaceAudience.Private
+@SuppressWarnings("serial")
+public class DeserializationException extends HBaseException {
+  public DeserializationException() {
+    super();
+  }
+
+  public DeserializationException(final String message) {
+    super(message);
+  }
+
+  public DeserializationException(final String message, final Throwable t) {
+    super(message, t);
+  }
+
+  public DeserializationException(final Throwable t) {
+    super(t);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/11864c60/hbase-common/src/main/java/org/apache/hadoop/hbase/exceptions/HBaseException.java
----------------------------------------------------------------------
diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/exceptions/HBaseException.java
b/hbase-common/src/main/java/org/apache/hadoop/hbase/exceptions/HBaseException.java
new file mode 100644
index 0000000..fe0d7d7
--- /dev/null
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/exceptions/HBaseException.java
@@ -0,0 +1,44 @@
+/**
+ * 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.hbase.exceptions;
+
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+
+/**
+ * Base checked exception in HBase.
+ * @see <a href="https://issues.apache.org/jira/browse/HBASE-5796">HBASE-5796</a>
+ */
+@SuppressWarnings("serial")
+@InterfaceAudience.Private
+public class HBaseException extends Exception {
+  public HBaseException() {
+    super();
+  }
+
+  public HBaseException(final String message) {
+    super(message);
+  }
+
+  public HBaseException(final String message, final Throwable t) {
+    super(message, t);
+  }
+
+  public HBaseException(final Throwable t) {
+    super(t);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/11864c60/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/ProtobufMagic.java
----------------------------------------------------------------------
diff --git a/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/ProtobufMagic.java
b/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/ProtobufMagic.java
new file mode 100644
index 0000000..17bee5e
--- /dev/null
+++ b/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/ProtobufMagic.java
@@ -0,0 +1,90 @@
+/**
+ * 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.hbase.protobuf;
+
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+
+/**
+ * Protobufs utility.
+ */
+@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="DP_CREATE_CLASSLOADER_INSIDE_DO_PRIVILEGED",
+  justification="None. Address sometime.")
+@InterfaceAudience.Private
+public class ProtobufMagic {
+
+  private ProtobufMagic() {
+  }
+
+  /**
+   * Magic we put ahead of a serialized protobuf message.
+   * For example, all znode content is protobuf messages with the below magic
+   * for preamble.
+   */
+  public static final byte [] PB_MAGIC = new byte [] {'P', 'B', 'U', 'F'};
+
+  /**
+   * @param bytes Bytes to check.
+   * @return True if passed <code>bytes</code> has {@link #PB_MAGIC} for a prefix.
+   */
+  public static boolean isPBMagicPrefix(final byte [] bytes) {
+    if (bytes == null) return false;
+    return isPBMagicPrefix(bytes, 0, bytes.length);
+  }
+
+  /*
+   * Copied from Bytes.java to here
+   * hbase-common now depends on hbase-protocol
+   * Referencing Bytes.java directly would create circular dependency
+   */
+  private static int compareTo(byte[] buffer1, int offset1, int length1,
+      byte[] buffer2, int offset2, int length2) {
+    // Short circuit equal case
+    if (buffer1 == buffer2 &&
+        offset1 == offset2 &&
+        length1 == length2) {
+      return 0;
+    }
+    // Bring WritableComparator code local
+    int end1 = offset1 + length1;
+    int end2 = offset2 + length2;
+    for (int i = offset1, j = offset2; i < end1 && j < end2; i++, j++) {
+      int a = (buffer1[i] & 0xff);
+      int b = (buffer2[j] & 0xff);
+      if (a != b) {
+        return a - b;
+      }
+    }
+    return length1 - length2;
+  }
+
+  /**
+   * @param bytes Bytes to check.
+   * @return True if passed <code>bytes</code> has {@link #PB_MAGIC} for a prefix.
+   */
+  public static boolean isPBMagicPrefix(final byte [] bytes, int offset, int len) {
+    if (bytes == null || len < PB_MAGIC.length) return false;
+    return compareTo(PB_MAGIC, 0, PB_MAGIC.length, bytes, offset, PB_MAGIC.length) == 0;
+  }
+
+  /**
+   * @return Length of {@link #PB_MAGIC}
+   */
+  public static int lengthOfPBMagic() {
+    return PB_MAGIC.length;
+  }
+}


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