Package com.j_spaces.core.client

Class ReadModifiers

java.lang.Object
com.j_spaces.core.client.ReadModifiers
public class ReadModifiers extends Object
The ReadModifiers class provides static methods and constants to decode Read type modifiers. The sets of modifiers are represented as integers with distinct bit positions representing different modifiers.

You could use bitwise or operator "|" to unite different modifiers.
Note that REPEATABLE_READ, DIRTY_READ and READ_COMMITTED are mutually exclusive (i.e. can't be used together). While EXCLUSIVE_READ_LOCK can be joined with any of them.

These modifiers can be set either at the proxy level IJSpace.setReadModifiers(int) or at the operation level (e.g. using one of IJSpace read/readIfExists/readMultiple/count methods with a modifiers parameter )

The default behavior is that of the REPEATABLE_READ modifier (as defined by the JavaSpace specification ).

Since:
6.0
Version:
1.0
Author:
Guy Korland
See Also:

  • Field Details

    • REPEATABLE_READ

      public static final int REPEATABLE_READ
      Allows read operations to have visibility of entities that are not write-locked or exclusively-locked by active transactions.
      This is the default read isolation-level.
      See Also:

    • DIRTY_READ

      public static final int DIRTY_READ
      Allows non-transactional read operations to have full visibility of the entities in the space, including entities that are exclusively-locked.
      See Also:

    • EXCLUSIVE_READ_LOCK

      public static final int EXCLUSIVE_READ_LOCK
      Allows read operations to have exclusive visibility of entities that are not locked by active transactions. Once exclusively locked, no other transactional operation is allowed. This supports the ability to perform reads in a "SELECT FOR UPDATE" fashion.
      See Also:

    • READ_COMMITTED

      public static final int READ_COMMITTED
      Allows read operations to have visibility of already committed entities, regardless of the fact that these entities might be updated (with a newer version) or taken under an uncommitted transaction.
      See Also:

    • MATCH_BY_ID

      @Deprecated public static final int MATCH_BY_ID
      Deprecated.
      use GigaSpace.takeById(Class, Object, Object) instead
      The int value required matching to be done only by UID if provided (not in POJO) modifier.
      Since:
      6.5
      See Also:

    • THROW_PARTIAL_FAILURE

      @Deprecated public static final int THROW_PARTIAL_FAILURE
      Deprecated.
      This is the default behavior, for old behavior use IGNORE_PARTIAL_FAILURE
      A modifier passed to read multiple and take multiple operations. The modifier will cause operation specific exception ReadMultipleException,TakeMultipleException to be thrown when not all of the requested number of entries are returned and one or more cluster members are not available.
      See Also:

    • IGNORE_PARTIAL_FAILURE

      public static final int IGNORE_PARTIAL_FAILURE
      A modifier passed to read multiple and take multiple operations. The modifier will cause partial results to be returned instead of throwing operation specific exception ReadMultipleException,TakeMultipleException when not all of the requested number of entries are returned and one or more cluster members are not available.
      Since:
      7.1
      See Also:

    • FIFO

      public static final int FIFO
      Indicates the operation should comply with First-In-First-Out order.
      See Also:

    • FIFO_GROUPING_POLL

      public static final int FIFO_GROUPING_POLL
      A modifier passed to take & read operations. The modifier will cause a group fifo poll based on the passed template. The template must have a property marked with the SpaceFifoGroupingProperty
      Since:
      9.0.0
      See Also:

  • Method Details

    • setIsolationLevelModifier

      public static int setIsolationLevelModifier(int modifiers, int newIsolationModifier)

    • isDirtyRead

      public static boolean isDirtyRead(int mod)
      Checks if the DIRTY_READ bit was set for this modifier.
      Parameters:
      mod - a set of modifiers
      Returns:
      true if mod includes the DIRTY_READ bit is set.

    • isExclusiveReadLock

      public static boolean isExclusiveReadLock(int mod)
      Checks if the EXCLUSIVE_READ_LOCK bit was set for this modifier.
      Parameters:
      mod - a set of modifiers
      Returns:
      true if mod includes the EXCLUSIVE_READ_LOCK bit is set.

    • isReadCommitted

      public static boolean isReadCommitted(int mod)
      Checks if the READ_COMMITTED bit was set for this modifier.
      Parameters:
      mod - a set of modifiers
      Returns:
      true if mod includes the READ_COMMITTED bit is set.

    • isRepeatableRead

      public static boolean isRepeatableRead(int mod)
      Checks if the REPEATABLE_READ bit was set for this modifier.
      Parameters:
      mod - a set of modifiers
      Returns:
      true if mod includes the REPEATABLE_READ bit is set.

    • isDefaultReadModifier

      public static boolean isDefaultReadModifier(int mod)

    • isMatchByID

      @Deprecated public static boolean isMatchByID(int mod)
      Deprecated.
      use GigaSpace.takeById(Class, Object, Object) instead
      Checks if the MATCH_BY_ID bit was set for this modifier.
      Parameters:
      mod - a set of modifiers
      Returns:
      true if mod includes the MATCH_BY_UID modifier; false otherwise.

    • isThrowPartialFailure

      @Deprecated public static boolean isThrowPartialFailure(int mod)
      Deprecated.
      This is the default behavior, for old behavior use IGNORE_PARTIAL_FAILURE
      Checks if the THROW_PARTIAL_FAILURE bit was set for this modifier.
      Parameters:
      mod - a set of modifiers

    • isFifo

      public static boolean isFifo(int mod)
      Checks if the FIFO bit was set for this modifier.
      Parameters:
      mod - a set of modifiers
      Returns:
      true if mod includes the FIFO modifier; false otherwise.

    • isFifoGroupingPoll

      public static boolean isFifoGroupingPoll(int mod)
      Checks if the FIFO_GROUPING_POLL bit was set for this modifier.
      Parameters:
      mod - a set of modifiers
      Returns:
      true if mod includes the FIFO_GROUPING_POLL modifier; false otherwise.

    • isMemoryOnlySearch

      public static boolean isMemoryOnlySearch(int mod)
      Checks if the MEMORY_ONLY_SEARCH bit was set for this modifier.
      Parameters:
      mod - a set of modifiers
      Returns:
      true if mod includes the MEMORY_ONLY_SEARCH modifier; false otherwise.
      Since:
      9.0.1