org.objectweb.jotm.impl.core.conflict
Class BasicConflictTable

java.lang.Object
  |
  +--org.objectweb.jotm.impl.core.conflict.BasicConflictTable

All Implemented Interfaces:

ConflictTable

public class BasicConflictTable

extends java.lang.Object

implements ConflictTable

BasicConflictTable is an implementation of conflict table. An example of a conflict table construction:

    String[] ops =     {"balance", "deposit", "withdraw"};
    boolean[][] cTable =
    /* balance * /    {{ false,     false,    false,},
    /* deposit * /     { false,     false,    true, },
    /* withdraw * /    { true,      true,     true  }};

    ConflictTable tab = new BasicConflictTable(ops, cTable);
   

In the example above, e.g., "balance" is not conflicting with any acquired lock mode, while "withdraw" is conflicting with all of them.

Constructor Summary

BasicConflictTable(java.lang.String[] iLocks, boolean[][] iConflictTable)
Constructs conflict table.

Method Summary

java.lang.String[]	getLockModes() Gets lock modes.
boolean	isConflict(java.lang.String requestLock, java.lang.String holdLock) Tests if there is conflict between two lock modes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BasicConflictTable

public BasicConflictTable(java.lang.String[] iLocks,
                          boolean[][] iConflictTable)

Constructs conflict table.

Parameters:

iLocks - lock modes

iConflictTable - table of conflicts, where the first index is the requested lock mode and the second index the acquired lock mode; true means there is a conflict, false othrwise

Method Detail

getLockModes

public java.lang.String[] getLockModes()

Description copied from interface: ConflictTable

Gets lock modes. The method return an array of all lock modes defined in this conflict table.

Specified by:

getLockModes in interface ConflictTable

Returns:

array of all conflict table lock modes

isConflict

public boolean isConflict(java.lang.String requestLock,
                          java.lang.String holdLock)
                   throws ConflictUndefinedException

Description copied from interface: ConflictTable

Tests if there is conflict between two lock modes. Note that it is important to differentiate between the requested and hold lock modes, since the conflict table can be assymetric.

Specified by:

isConflict in interface ConflictTable

Parameters:

requestLock - requested lock mode

holdLock - hold lock mode

Returns:

true if given lock modes are conflicting, false otherwise

Throws:

ConflictUndefinedException - if conflict between given lock modes is undefined