: Class ThreadCache

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## org.w3c.util
Class ThreadCache

    java.lang.Object
      |
      +--org.w3c.util.ThreadCache

public class ThreadCache
extends java.lang.Object

Field Summary
`protected int` | `cachesize` Number of cached threads.
`protected org.w3c.util.CachedThread` | `freelist` List of free threads.
`protected java.lang.ThreadGroup` | `group` The thread group for this thread cache.
`protected boolean` | `growasneeded` Should we queue thread requests, rather then creating new threads.
`protected int` | `idlethreads` Number of idle threads to always maintain alive.
`protected int` | `idletimeout` The idle timeout, for a thread to wait before being killed.
`protected boolean` | `inited` Has this thread cache been initialized ?
`protected int` | `threadcount` Number of created threads.
`protected int` | `threadid` Uniq thread identifier within this ThreadCache instance.
`protected int` | `threadpriority` Cached thread priority.
`protected int` | `usedthreads` Number of used threads

Constructor Summary
`ThreadCache(java.lang.String name)` Create a thread cache, after creating a new thread group.
`ThreadCache(java.lang.ThreadGroup group)` Create a thread cache, whose threads are to be children of the group.
`ThreadCache(java.lang.ThreadGroup parent, java.lang.String name)` Create a thread cache, after creating a new thread group.

Method Summary
`protected org.w3c.util.CachedThread` | `allocateThread(boolean waitp)` Allocate a new thread, as requested.
`boolean` | `getThread(java.lang.Runnable runnable, boolean waitp)` Request a thread to run on the given object.
`java.lang.ThreadGroup` | `getThreadGroup()` Get the ThreadGroup managed by this ThreadCache instance.
`int` | `getThreadPriority()` Get the cached thread normal priority.
`void` | `initialize()` Initialize the given thread cache.
`void` | `setCachesize(int cachesize)` Set the thread cache size.
`void` | `setCachesize(int cachesize, boolean update)` Set the thread cache size.
`void` | `setGrowAsNeeded(boolean onoff)` Enable/disable the thread cache to grow as needed.
`void` | `setIdleTimeout(int idletimeout)` Set the idle timeout.
`void` | `setThreadPriority(int priority)` Set all the cached threads priority.
`void` | `waitForCompletion()` Wait until all the threads have finished their duty

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### inited

    protected boolean inited

  Has this thread cache been initialized ?

### group

    protected java.lang.ThreadGroup group

  The thread group for this thread cache.

### cachesize

    protected int cachesize

  Number of cached threads.

### threadcount

    protected int threadcount

  Number of created threads.

### threadid

    protected int threadid

  Uniq thread identifier within this ThreadCache instance.

### idlethreads

    protected int idlethreads

  Number of idle threads to always maintain alive.

### growasneeded

    protected boolean growasneeded

  Should we queue thread requests, rather then creating new threads.

### usedthreads

    protected int usedthreads

  Number of used threads

### freelist

    protected org.w3c.util.CachedThread freelist

  List of free threads.

### idletimeout

    protected int idletimeout

  The idle timeout, for a thread to wait before being killed. Defaults to 5000 milliseconds.

### threadpriority

    protected int threadpriority

  Cached thread priority.

Constructor Detail

### ThreadCache

    public ThreadCache(java.lang.ThreadGroup group)

  Create a thread cache, whose threads are to be children of the group.
  Parameters:
    `group` - The thread group to which this thread cache is bound.
    `nstart` - Number of thread to create in advance.

### ThreadCache

    public ThreadCache(java.lang.String name)

  Create a thread cache, after creating a new thread group.
  Parameters:
    `name` - The name of the thread group to create.

### ThreadCache

    public ThreadCache(java.lang.ThreadGroup parent,
                       java.lang.String name)

  Create a thread cache, after creating a new thread group.
  Parameters:
    `parent` - The parent of the thread group to create.
    `name` - The name of the thread group.

Method Detail

### allocateThread

    protected org.w3c.util.CachedThread allocateThread(boolean waitp)

  Allocate a new thread, as requested.
  Parameters:
    `waitp` - Should we wait until a thread is available ?
  Returns:
    A launched CachedThread instance, or null if unable to allocate a new thread, and `waitp` is false.

### setCachesize

    public void setCachesize(int cachesize,
                             boolean update)

  Set the thread cache size. This will also update the number of idle threads to maintain, if requested.
  Parameters:
    `cachesize` - The new thread cache size.
    `update` - If true also update the number of threads to maintain idle.

### setCachesize

    public void setCachesize(int cachesize)

  Set the thread cache size. Updaet the number of idle threads to keep alive.
  Parameters:
    `cachesize` - The new thread cache size.

### setGrowAsNeeded

    public void setGrowAsNeeded(boolean onoff)

  Enable/disable the thread cache to grow as needed. This flag should be turned on only if always getting a thread as fast as possible is critical.
  Parameters:
    `onoff` - The toggle.

### setThreadPriority

    public void setThreadPriority(int priority)

  Set all the cached threads priority. Changing the cached thread priority should be done before the thread cache is initialized, it will not affect already created threads.
  Parameters:
    `priority` - The new cachewd threads priority.

### getThreadPriority

    public int getThreadPriority()

  Get the cached thread normal priority.
  Returns:
    Currently assigned cached thread priority.

### setIdleTimeout

    public void setIdleTimeout(int idletimeout)

  Set the idle timeout. The idle timeout value is used to eliminate threads that have remain idle for too long (although the thread cache will ensure that a decent minimal number of threads stay around).
  Parameters:
    `idletimeout` - The new idle timeout.

### getThread

    public boolean getThread(java.lang.Runnable runnable,
                             boolean waitp)

  Request a thread to run on the given object.
  Parameters:
    `runnable` - The object to run with the allocated thread.
    `waitp` - If true wait until a free thread is available, otherwise, return false.
  Returns:
    A boolean, true if a thread was successfully allocated for the given object, false otherwise.

### getThreadGroup

    public java.lang.ThreadGroup getThreadGroup()

  Get the ThreadGroup managed by this ThreadCache instance.
  Returns:
    A ThreadGroup instance.

### waitForCompletion

    public void waitForCompletion()

  Wait until all the threads have finished their duty

### initialize

    public void initialize()

  Initialize the given thread cache. This two stage initialize method is done so that configuration of the thread cache can be done before any thread get actually created.

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