Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/OpInfo.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 package org.dancres.blitz.entry; |
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2 |
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3 import java.io.Serializable; |
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4 import java.io.IOException; |
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5 |
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6 import org.dancres.blitz.txn.TxnState; |
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7 |
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8 import org.dancres.blitz.oid.OID; |
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9 |
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10 import org.dancres.blitz.mangler.MangledEntry; |
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11 |
3dc0c5604566
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12 /** |
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13 Every operation performed on the disk layer results in an OpInfo being |
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14 returned which will contain details of that operation which can be: |
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15 |
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16 <OL> |
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17 <LI> Logged to disk for recovery purposes either individually or as part |
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18 of a transaction record. In these cases, one recovers the OpInfo and |
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19 invokes <code>restore</code> followed by either <code>commit</code> or |
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20 <code>abort</code>. </LI>. |
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21 <LI> Used to finalize an operation either immediately in the case of a |
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22 null transaction or later as part of a full external transaction </LI> |
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23 </OL> |
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24 |
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25 Basic interaction with write is to invoke on the WriteBuddy just before |
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26 we place the EntrySleeve in the cache so it can set a write lock. We |
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27 then return the OpInfo which may be put into the list of a transactions |
3dc0c5604566
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28 operations or we commit it and then release the transaction lock asserted |
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29 by the WriteBuddy for null transactions <P> |
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30 |
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31 Basic interaction for a read or take is to iterate through EntrySleeves |
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32 pinning, offering to buddy and un-pinning. On success from buddy (we |
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33 keep a pin applied) knowing a transaction lock has been asserted. We then |
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34 return the OpInfo which will, again, either be commited immediately or |
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35 stored for a later commit. <P> |
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36 |
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37 Note that, because underlying implementations always pin their respective |
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38 entries in a cache, the Entry will be in cache and will be updated in |
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39 cache (because it can't be flushed). This means that restore can throw |
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40 a IOException as it reloads state but neither of commit or abort can. |
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41 */ |
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Dan Creswell <dan.creswell@gmail.com>
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42 public interface OpInfo extends Serializable { |
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43 |
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Dan Creswell <dan.creswell@gmail.com>
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44 /** |
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45 @return <code>true</code> if this operation is a debug operation with |
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46 no state that needs preserving |
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47 */ |
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48 public boolean isDebugOp(); |
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49 |
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50 /** |
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51 Restore memory-state required to apply this OpInfo. |
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52 */ |
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53 public void restore() throws IOException; |
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54 |
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Dan Creswell <dan.creswell@gmail.com>
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55 /** |
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56 Apply the action implied by this OpInfo to the underlying FS. |
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57 |
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58 @return the entry associated with the UID of this OpInfo if it |
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59 still exists (is not deleted). |
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60 */ |
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61 public MangledEntry commit(TxnState aState) throws IOException; |
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62 |
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63 /** |
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64 Abort the action implied by this OpInfo to the underlying FS. |
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65 |
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66 @return the entry associated with the UID of this OpInfo if it |
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67 still exists (is not deleted). |
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68 */ |
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69 public MangledEntry abort(TxnState aState) throws IOException; |
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70 |
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71 public String getType(); |
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72 |
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73 public OID getOID(); |
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74 } |