org.mapdb
Interface CC

public interface CC

Compiler Configuration. There are some static final boolean fields, which describe features MapDB was compiled with.

MapDB can be compiled with/without some features. For example fine logging is useful for debuging, but should not be present in production version. Java does not have preprocessor so we use Dead code elimination to achieve it.

Typical usage:

     if(CC.PARANOID && arg.calculateSize()!=33){  //calculateSize may take long time
         throw new IllegalArgumentException("wrong size");
     }
 

Author:

Jan Kotek

Field Summary

static int	ASYNC_RECID_PREALLOC_QUEUE_SIZE
static int	ASYNC_WRITE_FLUSH_DELAY
static int	ASYNC_WRITE_QUEUE_SIZE
static int	CONCURRENCY Concurrency level.
static String	DEFAULT_CACHE
static int	DEFAULT_CACHE_SIZE
static int	DEFAULT_FREE_SPACE_RECLAIM_Q
static boolean	FAIR_LOCKS controls if locks used in MapDB are fair
static boolean	LOG_STORE Compile-in detailed log messages from store.
static boolean	PARANOID Compile with more assertions and verifications.
static int	VOLUME_CHUNK_SHIFT

Field Detail

PARANOID

static final boolean PARANOID

Compile with more assertions and verifications. For example HashMap may check if keys implements hash function correctly. This may slow down MapDB thousands times

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Constant Field Values

LOG_STORE

static final boolean LOG_STORE

Compile-in detailed log messages from store.

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Constant Field Values

ASYNC_WRITE_FLUSH_DELAY

static final int ASYNC_WRITE_FLUSH_DELAY

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Constant Field Values

ASYNC_WRITE_QUEUE_SIZE

static final int ASYNC_WRITE_QUEUE_SIZE

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Constant Field Values

ASYNC_RECID_PREALLOC_QUEUE_SIZE

static final int ASYNC_RECID_PREALLOC_QUEUE_SIZE

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CONCURRENCY

static final int CONCURRENCY

Concurrency level. Should be greater than number of threads accessing MapDB concurrently. On other side larger number consumes more memory

This number must be power of two: `CONCURRENCY = 2^N`

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Constant Field Values

DEFAULT_CACHE_SIZE

static final int DEFAULT_CACHE_SIZE

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DEFAULT_CACHE

static final String DEFAULT_CACHE

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DEFAULT_FREE_SPACE_RECLAIM_Q

static final int DEFAULT_FREE_SPACE_RECLAIM_Q

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FAIR_LOCKS

static final boolean FAIR_LOCKS

controls if locks used in MapDB are fair

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VOLUME_CHUNK_SHIFT

static final int VOLUME_CHUNK_SHIFT

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Constant Field Values