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java.lang.Objectorg.apache.jdo.impl.fostore.RequestHandler
org.apache.jdo.impl.fostore.InsertHandler
Process requests to insert objects in the datastore.
Nested Class Summary | |
private class |
InsertHandler.InsertFinisher
Changes all provisional OID's in an instance's in-store Block to real, datastore OID's. |
(package private) static interface |
RequestHandler.HandlerFactory
Means by which subclasses are created. |
Field Summary | |
protected FOStoreServerConnection |
con
Connection on which the Request arrived. |
(package private) static RequestHandler.HandlerFactory |
factory
|
protected int |
length
Length of the data in the Request. |
(package private) static org.apache.commons.logging.Log |
logger
Logger |
private static I18NHelper |
msg
I18N help |
protected Reply |
reply
Subclasses use this Reply instance to send data back to their corresponding client-side request. |
Constructor Summary | |
(package private) |
InsertHandler(Reply reply,
int length,
FOStoreServerConnection con)
|
Method Summary | |
protected boolean |
getOkToFinish()
The RollbackHandler should override this and return false, so that finishers are not run when we are rolling back. |
(package private) RequestFinisher |
handleRequest()
Subclasses implement this to take care of individiual requests. |
(package private) static void |
handleRequests(FOStoreServerConnection con)
Handles all requests that can be read at this time from the given connection. |
protected Block |
readBlock(FOStoreInput in)
|
protected void |
setOkToCommit(boolean okToCommit)
The CommitHandler should override this and save the given value, then use it to determine whether or not to commit. |
protected void |
updateDB(OID realOID,
OID givenOID,
Block block,
FOStoreDatabase db)
Add the block to the database, and to the database's extent. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
private static final I18NHelper msg
static final RequestHandler.HandlerFactory factory
protected final Reply reply
protected final int length
protected final FOStoreServerConnection con
static final org.apache.commons.logging.Log logger
Constructor Detail |
InsertHandler(Reply reply, int length, FOStoreServerConnection con)
Method Detail |
RequestFinisher handleRequest() throws java.io.IOException, FOStoreDatabaseException
RequestHandler
handleRequest
in class RequestHandler
java.io.IOException
FOStoreDatabaseException
RequestHandler.handleRequest()
protected Block readBlock(FOStoreInput in) throws java.io.IOException
java.io.IOException
protected void updateDB(OID realOID, OID givenOID, Block block, FOStoreDatabase db) throws java.io.IOException, FOStoreDatabaseException
realOID
- OID to use as key in the database.givenOID
- by which object was inserted, possibly provisional.block
- Block to be inserted in database.db
- Database into which block is inserted.
java.io.IOException
FOStoreDatabaseException
protected boolean getOkToFinish()
protected void setOkToCommit(boolean okToCommit)
static void handleRequests(FOStoreServerConnection con)
The data it generates for the client is documented; see ReplyHandler.processReplies(java.io.DataInput, org.apache.jdo.impl.fostore.Message)
.
If after all requests are thusly handled, none have indicated that the second round of handling, called finishing, is not to be done, then performs this second round. The finishers that are invoked are precisely those which were returned from each request's handleRequest invocation, and the finishers have their finish() methods invoked in the same order in which the requests were originally invoked.
Finally, writes the number of replies (at the beginning of the reply data, in a spot that was set aside for this purpose), and sends replies back to the client.
This method is very paranoid about error checking, which clutters it up some, but is necessary to ensure that the server keeps running.
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