org.objectweb.cjdbc.controller.loadbalancer.raidb1
Class RAIDb1ec_WRR
java.lang.Object
org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer
org.objectweb.cjdbc.controller.loadbalancer.raidb1.RAIDb1
org.objectweb.cjdbc.controller.loadbalancer.raidb1.RAIDb1ec
org.objectweb.cjdbc.controller.loadbalancer.raidb1.RAIDb1ec_WRR
- public class RAIDb1ec_WRR
- extends RAIDb1ec
RAIDb-1 Weighted Round Robin load balancer with error checking.
This load balancer tolerates byzantine failures of databases. The read
requests coming from the Request Manager are sent to multiple backend
nodes and the results are compared. Write requests are broadcasted to all
backends.
- Version:
- 1.0
- Author:
- Emmanuel Cecchet, Julie Marguerite
Field Summary |
private int |
index
|
private java.util.HashMap |
weights
|
Method Summary |
java.sql.ResultSet |
execReadRequest(SelectRequest request)
Not implemented. |
java.lang.String |
getInformation()
Gets information about the request load balancer. |
java.lang.String |
getRaidb1Xml()
Surrounding raidb1 tags can be treated by
getXmlInformation above, but
more detailed content have to be returned by the method
getRaidb1Xmlbelow. |
void |
setWeight(java.lang.String name,
int w)
Associate a weight to a backend identified by its logical name. |
Methods inherited from class org.objectweb.cjdbc.controller.loadbalancer.raidb1.RAIDb1 |
begin, commit, execReadStoredProcedure, executeRequest, execWriteRequest, execWriteRequestWithKeys, execWriteStoredProcedure, getXmlWaitPolicy, rollback, waitForAllWritesToComplete, waitForAllWritesToComplete, waitForAllWritesToComplete |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
index
private int index
weights
private java.util.HashMap weights
RAIDb1ec_WRR
public RAIDb1ec_WRR(VirtualDatabase vdb,
WaitForCompletionPolicy waitForCompletionPolicy,
ErrorCheckingPolicy errorCheckingPolicy,
int nbOfConcurrentReads)
throws java.sql.SQLException
- Creates a new RAIDb-1 Weighted Round Robin with error checking request
load balancer.
- Parameters:
vdb
- the virtual database this load balancer belongs to.waitForCompletionPolicy
- How many backends must complete before returning
the result?errorCheckingPolicy
- policy to apply for error checking.nbOfConcurrentReads
- number of concurrent reads allowed
- Throws:
java.sql.SQLException
- if an error occurs
execReadRequest
public java.sql.ResultSet execReadRequest(SelectRequest request)
throws java.sql.SQLException
- Not implemented.
- Specified by:
execReadRequest
in class RAIDb1
- Throws:
java.sql.SQLException
- See Also:
RAIDb1.executeRequest(SelectRequest, DatabaseBackend)
setWeight
public void setWeight(java.lang.String name,
int w)
throws java.sql.SQLException
- Description copied from class:
AbstractLoadBalancer
- Associate a weight to a backend identified by its logical name.
- Overrides:
setWeight
in class AbstractLoadBalancer
- Parameters:
name
- the backend namew
- the weight
- Throws:
java.sql.SQLException
- if an error occurs- See Also:
AbstractLoadBalancer.setWeight(String, int)
getInformation
public java.lang.String getInformation()
- Gets information about the request load balancer.
- Specified by:
getInformation
in class AbstractLoadBalancer
- Returns:
String
containing information
getRaidb1Xml
public java.lang.String getRaidb1Xml()
- Description copied from class:
RAIDb1
- Surrounding raidb1 tags can be treated by
getXmlInformation above, but
more detailed content have to be returned by the method
getRaidb1Xmlbelow.
- Specified by:
getRaidb1Xml
in class RAIDb1
- Returns:
- content of Raidb1 xml
- See Also:
RAIDb1.getRaidb1Xml()
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