# Class: AsyncMap

## vertx-js/async_map~ AsyncMap

#### new AsyncMap()

  An asynchronous map.
  Source:
    - async_map.js, line 30

### Methods

#### clear(resultHandler)

  Clear all entries in the map

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `resultHandler` | function | called on completion

  Source:
    - async_map.js, line 207

#### get(k, resultHandler)

  Get a value from the map, asynchronously.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `k` | Object | the key
  `resultHandler` | function | this will be called some time later with the async result.

  Source:
    - async_map.js, line 42

#### put(k, v, ttl, completionHandler)

  Like AsyncMap#put but specifying a timeout. If the value cannot be put within the timeout a failure will be passed to the handler

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `k` | Object | the key
  `v` | Object | the value
  `ttl` | number | The time to live (in ms) for the entry
  `completionHandler` | function | the handler

  Source:
    - async_map.js, line 65

#### putIfAbsent(k, v, ttl, completionHandler)

  Link AsyncMap#putIfAbsent but specifying a timeout. If the value cannot be put within the timeout a failure will be passed to the handler

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `k` | Object | the key
  `v` | Object | the value
  `ttl` | number | The time to live (in ms) for the entry
  `completionHandler` | function | the handler

  Source:
    - async_map.js, line 96

#### remove(k, resultHandler)

  Remove a value from the map, asynchronously.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `k` | Object | the key
  `resultHandler` | function | this will be called some time later to signify the value has been removed

  Source:
    - async_map.js, line 124

#### removeIfPresent(k, v, resultHandler)

  Remove a value from the map, only if entry already exists with same value.

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `k` | Object | the key
  `v` | Object | the value
  `resultHandler` | function | this will be called some time later to signify the value has been removed

  Source:
    - async_map.js, line 145

#### replace(k, v, resultHandler)

  Replace the entry only if it is currently mapped to some value

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `k` | Object | the key
  `v` | Object | the new value
  `resultHandler` | function | the result handler will be passed the previous value

  Source:
    - async_map.js, line 166

#### replaceIfPresent(k, oldValue, newValue, resultHandler)

  Replace the entry only if it is currently mapped to a specific value

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `k` | Object | the key
  `oldValue` | Object | the existing value
  `newValue` | Object | the new value
  `resultHandler` | function | the result handler

  Source:
    - async_map.js, line 188

#### size(resultHandler)

  Provide the number of entries in the map

  ##### Parameters:

  Name | Type | Description
  --- | --- | ---
  `resultHandler` | function | handler which will receive the number of entries

  Source:
    - async_map.js, line 226