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before we look at the source code must first know what the basic structure of ConcurrentHashMap. ConcurrentHashMap segment is the use of locks to control concurrency.
Wherein an internal class used to represent the class Segment lock. The Segment class have a HashEntry <K, V> [] array that is the real use
to store our key-value is.
Approximately follows the structure of FIG. A Segment array, each array element is a Segment HashEntry array
look ahead we must understand the source of several default constant value:
DEFAULT_INITIAL_CAPACITY default capacity of the container 16 = 16
DEFAULT_LOAD_FACTOR default = 0.75f expansion factor is 0.75
DEFAULT_CONCURRENCY_LEVEL default = 16 concurrency is 16
MAXIMUM_CAPACITY = 1 << 30 the maximum capacity of the container 1073741824
MIN_SEGMENT_TABLE_CAPACITY minimum size = 2 segment
MAX_SEGMENTS = 1 << 16 the maximum size of the segment
number of RETRIES_BEFORE_LOCK = 2 acquired size as not to attempt to acquire a lock
The default value is well above ConcurrentHashMap defined in the following places many of us will use them.
Start to begin initialization
by us by using ConcurrentHashMap are ConcurrentHashMap <String, String> map = new ConcurrentHashMap <> (); way
we follow the point into the source
/ **
* Creates new new A, with A default empty Map Initial Capacity (16),
. * Load factor (0.75) and concurrencyLevel (16)
* /
public of ConcurrentHashMap () {
the this (DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_CONCURRENCY_LEVEL);
}
can be seen, the non-default parameters invoked another parameterized constructor constructor, and the constructor is passed when no matter what you come initialization parameters, will eventually jump to the parameterized constructor.
See in this point into parameterized constructor function implements what
public of ConcurrentHashMap (int initialCapacity,
a float loadFactor, int concurrencyLevel) {
IF (! (LoadFactor> 0) initialCapacity || <|| concurrencyLevel 0 <= 0)
throw new IllegalArgumentException();
if (concurrencyLevel > MAX_SEGMENTS)
concurrencyLevel = MAX_SEGMENTS;
// Find power-of-two sizes best matching arguments
int sshift = 0;
int ssize = 1;
while (ssize < concurrencyLevel) {
++sshift;
ssize <<= 1;
}
this.segmentShift = 32 - sshift;
this.segmentMask = ssize - 1;
if (initialCapacity > MAXIMUM_CAPACITY)
initialCapacity = MAXIMUM_CAPACITY;
int c = initialCapacity / ssize;
if (c * ssize < initialCapacity)
++c;
int cap = M