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java.lang.Objectorg.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer
org.objectweb.cjdbc.controller.loadbalancer.singledb.SingleDB
Single Database request load balancer.
The requests coming from the request controller are directly forwarded to the single backend. This load balancer does not support multiple backends.
Field Summary | |
private DatabaseBackend |
backend
|
private static Trace |
logger
|
Fields inherited from class org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer |
parsingGranularity, raidbLevel, vdb |
Constructor Summary | |
SingleDB(VirtualDatabase vdb)
Creates a new SingleDB instance. |
Method Summary | |
void |
begin(TransactionMarkerMetaData tm)
Begins a new transaction. |
void |
commit(TransactionMarkerMetaData tm)
Commits a transaction. |
void |
disableBackend(DatabaseBackend db)
Disables a backend that was previously enabled. |
void |
enableBackend(DatabaseBackend db)
Enables a backend that was previously disabled. |
java.sql.ResultSet |
execReadRequest(SelectRequest request)
Performs a read request. |
java.sql.ResultSet |
execReadStoredProcedure(StoredProcedure proc)
Call a stored procedure that returns a ResultSet. |
int |
execWriteRequest(AbstractWriteRequest request)
Performs a write request on the backend. |
java.sql.ResultSet |
execWriteRequestWithKeys(AbstractWriteRequest request)
Perform a write request and return a ResultSet containing the auto generated keys. |
int |
execWriteStoredProcedure(StoredProcedure proc)
Call a stored procedure that performs an update. |
java.lang.String |
getInformation()
Gets information about the request load balancer |
java.lang.String |
getXmlInformation()
Get information about the Request Load Balancer in xml |
void |
rollback(TransactionMarkerMetaData tm)
Rollbacks a transaction. |
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.AbstractLoadBalancer |
getParsingGranularity, getRAIDbLevel, setParsingGranularity, setRAIDbLevel |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
private DatabaseBackend backend
private static Trace logger
Constructor Detail |
public SingleDB(VirtualDatabase vdb) throws java.sql.SQLException
SingleDB
instance.
vdb
- the VirtualDatabase
this load balancer belongs to
java.sql.SQLException
- if there is not exactly one backend attached to the
VirtualDatabase
Method Detail |
public java.sql.ResultSet execReadRequest(SelectRequest request) throws java.sql.SQLException
execReadRequest
in class AbstractLoadBalancer
request
- an SelectRequest
java.sql.ResultSet
java.sql.SQLException
- if an error occurspublic int execWriteRequest(AbstractWriteRequest request) throws java.sql.SQLException
execWriteRequest
in class AbstractLoadBalancer
request
- an AbstractWriteRequest
java.sql.SQLException
- if an error occurspublic java.sql.ResultSet execWriteRequestWithKeys(AbstractWriteRequest request) throws java.sql.SQLException
AbstractLoadBalancer
execWriteRequestWithKeys
in class AbstractLoadBalancer
request
- an AbstractWriteRequest
java.sql.SQLException
- if an error occursAbstractLoadBalancer.execWriteRequestWithKeys(AbstractWriteRequest)
public java.sql.ResultSet execReadStoredProcedure(StoredProcedure proc) throws java.sql.SQLException
AbstractLoadBalancer
execReadStoredProcedure
in class AbstractLoadBalancer
proc
- the stored procedure call
java.sql.ResultSet
value
java.sql.SQLException
- if an error occursAbstractLoadBalancer.execReadStoredProcedure(org.objectweb.cjdbc.sql.StoredProcedure)
public int execWriteStoredProcedure(StoredProcedure proc) throws java.sql.SQLException
AbstractLoadBalancer
execWriteStoredProcedure
in class AbstractLoadBalancer
proc
- the stored procedure call
java.sql.SQLException
- if an error occursAbstractLoadBalancer.execWriteStoredProcedure(org.objectweb.cjdbc.sql.StoredProcedure)
public void begin(TransactionMarkerMetaData tm) throws java.sql.SQLException
begin
in class AbstractLoadBalancer
tm
- the transaction marker metadata
java.sql.SQLException
- if an error occurspublic void commit(TransactionMarkerMetaData tm) throws java.sql.SQLException
commit
in class AbstractLoadBalancer
tm
- the transaction marker metadata
java.sql.SQLException
- if an error occurspublic void rollback(TransactionMarkerMetaData tm) throws java.sql.SQLException
rollback
in class AbstractLoadBalancer
tm
- the transaction marker metadata
java.sql.SQLException
- if an error occurspublic void enableBackend(DatabaseBackend db) throws java.sql.SQLException
enableBackend
in class AbstractLoadBalancer
db
- the database backend to enable
java.sql.SQLException
- if an error occurspublic void disableBackend(DatabaseBackend db) throws java.sql.SQLException
disableBackend
in class AbstractLoadBalancer
db
- the database backend to disable
java.sql.SQLException
- if an error occurspublic void setWeight(java.lang.String name, int w) throws java.sql.SQLException
AbstractLoadBalancer
setWeight
in class AbstractLoadBalancer
name
- the backend namew
- the weight
java.sql.SQLException
- if an error occursAbstractLoadBalancer.setWeight(String, int)
public java.lang.String getInformation()
getInformation
in class AbstractLoadBalancer
String
containing informationpublic java.lang.String getXmlInformation()
AbstractLoadBalancer
getXmlInformation
in class AbstractLoadBalancer
String
containing information, xml formattedAbstractLoadBalancer.getXmlInformation()
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