Public Member Functions | |
| RAIDb1_WRR (VirtualDatabase vdb, WaitForCompletionPolicy waitForCompletionPolicy) throws Exception | |
| ControllerResultSet | execReadRequest (SelectRequest request, MetadataCache metadataCache) throws SQLException |
| ControllerResultSet | execReadOnlyReadStoredProcedure (StoredProcedure proc, MetadataCache metadataCache) throws SQLException |
| void | setWeight (String name, int w) throws SQLException |
| String | getInformation () |
| String | getRaidb1Xml () |
The read requests coming from the request manager are sent to the backend nodes using a weighted round robin. Write requests are broadcasted to all backends.
Definition at line 57 of file RAIDb1_WRR.java.
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Creates a new RAIDb-1 Weighted Round Robin request load balancer.
Definition at line 82 of file RAIDb1_WRR.java. 00084 {
00085 super(vdb, waitForCompletionPolicy);
00086 index = -1;
00087 }
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Selects the backend using a least pending request first policy. The backend that has the shortest queue of currently executing queries is chosen to execute this stored procedure.
Implements org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer. Definition at line 114 of file RAIDb1_WRR.java. 00116 {
00117 return executeWRR(proc, false, "Stored procedure ", metadataCache);
00118 }
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Selects the backend using a weighted round-robin algorithm and executes the read request.
Implements org.objectweb.cjdbc.controller.loadbalancer.raidb1.RAIDb1. Definition at line 100 of file RAIDb1_WRR.java. 00102 {
00103 return executeWRR(request, true, "Request ", metadataCache);
00104 }
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Gets information about the request load balancer.
Implements org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer. Definition at line 277 of file RAIDb1_WRR.java. 00278 {
00279 // We don't lock since we don't need a top accurate value
00280 int size = vdb.getBackends().size();
00281
00282 if (size == 0)
00283 return "RAIDb-1 with Weighted Round Robin Request load balancer: !!!Warning!!! No backend nodes found\n";
00284 else
00285 return "RAIDb-1 Weighted Round-Robin Request load balancer (" + size
00286 + " backends)\n";
00287 }
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Implements org.objectweb.cjdbc.controller.loadbalancer.raidb1.RAIDb1. Definition at line 292 of file RAIDb1_WRR.java. 00293 {
00294 return WeightedBalancer.getRaidbXml(weights,
00295 DatabasesXmlTags.ELT_RAIDb_1_WeightedRoundRobin);
00296 }
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Reimplemented from org.objectweb.cjdbc.controller.loadbalancer.AbstractLoadBalancer. Definition at line 259 of file RAIDb1_WRR.java. References org.objectweb.cjdbc.common.log.Trace.debug(). 00260 {
00261 if (logger.isDebugEnabled())
00262 logger.debug(Translate.get("loadbalancer.weight.set", new String[]{
00263 String.valueOf(w), name}));
00264
00265 weights.put(name, new Integer(w));
00266 }
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1.3.9.1