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## rice.p2p.splitstream
Class Stripe

    java.lang.Object
      rice.p2p.splitstream.Stripe

All Implemented Interfaces:
  ScribeClient

    public class Stripe

extends java.lang.Object
implements ScribeClient

This class encapsulates all data about an individual stripe. It is the basic unit in the system. It is rooted at the stripeId for the stripe. It is through the stripe that data is sent. It can be subscribed to in which case data is recieved or it can be unsubscribed from. A stripe can have some number of children and controlling this is the way that bandwidth is controlled. If a stripe is dropped then it searches for a new parent.

Version:
  $Id: Stripe.java 4654 2009-01-08 16:33:07Z jeffh $
Author:
  Ansley Post, Alan Mislove, Atul Singh

Field Summary
`protected Channel` | `channel` This stripe's channel
`protected java.util.Vector<SplitStreamClient>` | `clients` The list of SplitStreamClients interested in data from this client
`protected java.util.Hashtable<Topic,java.lang.Integer>` | `failed` The count of failed subscribe messages
`protected java.lang.String` | `instance`
`protected boolean` | `isPrimary` A flag whether or not this stripe is the primary stripe for this node
`int` | `MAX_FAILED_SUBSCRIPTION` The maximum number of failed subscriptions
`protected Scribe` | `scribe` The scribe object
`protected StripeId` | `stripeId` The stripeId for this stripe
`protected Topic` | `topic` The topic corresponding to this stripeId

Constructor Summary
`Stripe(StripeId stripeId, Scribe scribe, java.lang.String instance, Channel channel, int maxFailedSubscriptions)` The constructor used when creating a stripe from scratch.

Method Summary
`boolean` | `anycast(Topic topic, ScribeContent content)` This method is invoked when an anycast is received for a topic which this client is interested in.
`void` | `childAdded(Topic topic, NodeHandle child)` Informs this client that a child was added to a topic in which it was interested in.
`void` | `childRemoved(Topic topic, NodeHandle child)` Informs this client that a child was removed from a topic in which it was interested in.
`void` | `deliver(Topic topic, ScribeContent content)` This method is invoked when a message is delivered for a topic this client is interested in.
`NodeHandle[]` | `getChildren()` Utility method.
`NodeHandle` | `getParent()` Utility method.
`StripeId` | `getStripeId()` gets the StripeID for this stripe
`boolean` | `isPrimary()` Returns whether or not this stripe is the primary stripe for the local node
`boolean` | `isRoot()` Utility method.
`boolean` | `isSubscribed()` get the state of the Stripe
`void` | `publish(byte[] data)` Publishes the given data to this stripe
`void` | `subscribe(SplitStreamClient client)` Adds a client to this stripe - the client will be informed whenever data arrives for this stripe
`void` | `subscribeFailed(Topic topic)` Informs this client that a subscription failed
`java.lang.String` | `toString()` Returns a String representation of this Stripe
`void` | `unsubscribe(SplitStreamClient client)` Removes a client from this stripe - the client will no longer be informed whenever data arrives for this stripe

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### MAX_FAILED_SUBSCRIPTION

    public final int MAX_FAILED_SUBSCRIPTION

  The maximum number of failed subscriptions

### stripeId

    protected StripeId stripeId

  The stripeId for this stripe

### topic

    protected Topic topic

  The topic corresponding to this stripeId

### scribe

    protected Scribe scribe

  The scribe object

### isPrimary

    protected boolean isPrimary

  A flag whether or not this stripe is the primary stripe for this node

### clients

    protected java.util.Vector<SplitStreamClient> clients

  The list of SplitStreamClients interested in data from this client

### channel

    protected Channel channel

  This stripe's channel

### failed

    protected java.util.Hashtable<Topic,java.lang.Integer> failed

  The count of failed subscribe messages

### instance

    protected java.lang.String instance

Constructor Detail

### Stripe

    public Stripe(StripeId stripeId,
                  Scribe scribe,
                  java.lang.String instance,
                  Channel channel,
                  int maxFailedSubscriptions)

  The constructor used when creating a stripe from scratch.

  Parameters:
    `stripeId` - the stripeId that this stripe will be rooted at
    `scribe` - the scribe the stripe is running on top of

Method Detail

### getStripeId

    public StripeId getStripeId()

  gets the StripeID for this stripe

  Returns:
    theStripeID

### isPrimary

    public boolean isPrimary()

  Returns whether or not this stripe is the primary stripe for the local node

  Returns:
    Whether or not this stripe is primary

### isSubscribed

    public boolean isSubscribed()

  get the state of the Stripe

  Returns:
    the State the stripe is in

### subscribe

    public void subscribe(SplitStreamClient client)

  Adds a client to this stripe - the client will be informed whenever data arrives for this stripe

  Parameters:
    `client` - The client to add

### unsubscribe

    public void unsubscribe(SplitStreamClient client)

  Removes a client from this stripe - the client will no longer be informed whenever data arrives for this stripe

  Parameters:
    `client` - The client to remove

### publish

    public void publish(byte[] data)

  Publishes the given data to this stripe

  Parameters:
    `data` - The data to publish

### anycast

    public boolean anycast(Topic topic,
                           ScribeContent content)

  This method is invoked when an anycast is received for a topic which this client is interested in. The client should return whether or not the anycast should continue.

  Specified by:
    `anycast` in interface `ScribeClient`
  Parameters:
    `topic` - The topic the message was anycasted to
    `content` - The content which was anycasted
  Returns:
    Whether or not the anycast should continue

### deliver

    public void deliver(Topic topic,
                        ScribeContent content)

  This method is invoked when a message is delivered for a topic this client is interested in.

  Specified by:
    `deliver` in interface `ScribeClient`
  Parameters:
    `topic` - The topic the message was published to
    `content` - The content which was published

### childAdded

    public void childAdded(Topic topic,
                           NodeHandle child)

  Informs this client that a child was added to a topic in which it was interested in.

  Specified by:
    `childAdded` in interface `ScribeClient`
  Parameters:
    `topic` - The topic to unsubscribe from
    `child` - The child that was added

### childRemoved

    public void childRemoved(Topic topic,
                             NodeHandle child)

  Informs this client that a child was removed from a topic in which it was interested in.

  Specified by:
    `childRemoved` in interface `ScribeClient`
  Parameters:
    `topic` - The topic to unsubscribe from
    `child` - The child that was removed

### subscribeFailed

    public void subscribeFailed(Topic topic)

  Informs this client that a subscription failed

  Specified by:
    `subscribeFailed` in interface `ScribeClient`
  Parameters:
    `topic` - The topic that failed

### toString

    public java.lang.String toString()

  Returns a String representation of this Stripe

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    A String representing this stripe

### getChildren

    public NodeHandle[] getChildren()

  Utility method. Returns the list of children for this stripe.

  Returns:
    A array of children.

### getParent

    public NodeHandle getParent()

  Utility method. Returns the parent for this topic in the scribe tree.

  Returns:
    Parent for this topic.

### isRoot

    public boolean isRoot()

  Utility method. Checks if local node is root for this topic.

  Returns:
    True/False depending on if local node is root for this topic

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