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Class JavaGroups.Util

java.lang.Object
   |
   +----JavaGroups.Util

public class Util

extends Object

Util()

Array2String(boolean[])

Array2String(int[])

Array2String(long[])

Crash()

DefragmentBuffer(byte[][])

Concatenates smaller fragments into entire buffers.

DumpStack(boolean)

FragmentBuffer(byte[], int)

Fragments a byte buffer into smaller fragments of (max.) frag_size.

main(String[])

ObjectFromByteBuffer(byte[])

Creates an object from a byte buffer

ObjectToByteBuffer(Object)

Serializes an object into a byte buffer.

PeekViews(Channel, int, long)

Peeks for view on the channel until n views have been received or timeout has elapsed.

PickSubset(Vector, double)

Selects a random subset of members according to subset_percentage and returns them.

Print(String)

PrintEvent(Event)

PrintFragments(byte[][])

PrintMessage(Message)

Tries to read an object from the message's buffer and prints it

PrintMethodCall(Message)

Tries to read a MethodCall object from the message's buffer and prints it.

PrintThreads()

Sleep(long)

SleepRandom(long)

Sleeps between 1 and timeout milliseconds, chosen randomly.

 public Util()

 public static Object ObjectFromByteBuffer(byte buffer[]) throws Exception

Creates an object from a byte buffer

 public static byte[] ObjectToByteBuffer(Object obj) throws Exception

Serializes an object into a byte buffer. The object has to implement interface Serializable.

 public static void Sleep(long timeout)

 public static void SleepRandom(long timeout)

Sleeps between 1 and timeout milliseconds, chosen randomly. Timeout must be > 1

 public static void DumpStack(boolean exit)

 public static void Crash()

 public static String PrintEvent(Event evt)

 public static String PrintMessage(Message msg)

Tries to read an object from the message's buffer and prints it

 public static String PrintMethodCall(Message msg)

Tries to read a MethodCall object from the message's buffer and prints it. Returns empty string if object is not a method call

 public static void Print(String msg)

 public static void PrintThreads()

 public static byte[][] FragmentBuffer(byte buf[],
                                       int frag_size)

Fragments a byte buffer into smaller fragments of (max.) frag_size. Example: a byte buffer of 1024 bytes and a frag_size of 248 gives 4 fragments of 248 bytes each and 1 fragment of 32 bytes.

Returns:

An array of byte buffers (byte[]).

 public static byte[] DefragmentBuffer(byte fragments[][])

Concatenates smaller fragments into entire buffers.

Parameters:

fragments - An array of byte buffers (byte[])

Returns:

A byte buffer

 public static void PrintFragments(byte frags[][])

 public static View PeekViews(Channel channel,
                              int number_of_views,
                              long timeout)

Peeks for view on the channel until n views have been received or timeout has elapsed. Used to determine the view in which we want to start work. Usually, we start as only member in our own view (1st view) and the next view (2nd view) will be the full view of all members, or a timeout if we're the first member. If a non-view (a message or block) is received, the method returns immediately.

Parameters:

channel - The channel used to peek for views. Has to be operational.

number_of_views - The number of views to wait for. 2 is a good number to ensure that, if there are other members, we start working with them included in our view.

timeout - Number of milliseconds to wait until view is forced to return. A value of <= 0 means wait forever.

 public static String Array2String(long array[])

 public static String Array2String(int array[])

 public static String Array2String(boolean array[])

 public static Vector PickSubset(Vector members,
                                 double subset_percentage)

Selects a random subset of members according to subset_percentage and returns them. Picks no member twice from the same membership. If the percentage is smaller than 1 -> picks 1 member.

 public static void main(String args[])

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