Package com.amazonaws.http
Class IdleConnectionReaper
java.lang.Object
java.lang.Thread
com.amazonaws.http.IdleConnectionReaper
- All Implemented Interfaces:
Runnable
Daemon thread to periodically check connection pools for idle connections.
Connections sitting around idle in the HTTP connection pool for too long will
eventually be terminated by the AWS end of the connection, and will go into
CLOSE_WAIT. If this happens, sockets will sit around in CLOSE_WAIT, still
using resources on the client side to manage that socket. Many sockets stuck
in CLOSE_WAIT can prevent the OS from creating new connections.
This class closes idle connections before they can move into the CLOSE_WAIT
state.
This thread is important because by default, we disable Apache HttpClient's
stale connection checking, so without this thread running in the background,
cleaning up old/inactive HTTP connections, we'd see more IO exceptions when
stale connections (i.e. closed on the AWS side) are left in the connection
pool, and requests grab one of them to begin executing a request.
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Nested Class Summary
Nested classes/interfaces inherited from class java.lang.Thread
Thread.State, Thread.UncaughtExceptionHandler
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Field Summary
Fields inherited from class java.lang.Thread
MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY
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Method Summary
Modifier and TypeMethodDescriptionstatic boolean
registerConnectionManager
(org.apache.http.conn.HttpClientConnectionManager connectionManager) Registers the given connection manager with this reaper;static boolean
removeConnectionManager
(org.apache.http.conn.HttpClientConnectionManager connectionManager) Removes the given connection manager from this reaper, and shutting down the reaper if there is zero connection manager left.void
run()
static boolean
shutdown()
Shuts down the thread, allowing the class and instance to be collected.Methods inherited from class java.lang.Thread
activeCount, checkAccess, clone, countStackFrames, currentThread, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, onSpinWait, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, suspend, toString, yield
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Method Details
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registerConnectionManager
public static boolean registerConnectionManager(org.apache.http.conn.HttpClientConnectionManager connectionManager) Registers the given connection manager with this reaper;- Returns:
- true if the connection manager has been successfully registered; false otherwise.
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removeConnectionManager
public static boolean removeConnectionManager(org.apache.http.conn.HttpClientConnectionManager connectionManager) Removes the given connection manager from this reaper, and shutting down the reaper if there is zero connection manager left.- Returns:
- true if the connection manager has been successfully removed; false otherwise.
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shutdown
public static boolean shutdown()Shuts down the thread, allowing the class and instance to be collected. Since this is a daemon thread, its running will not prevent JVM shutdown. It will, however, prevent this class from being unloaded or garbage collected, in the context of a long-running application, until it is interrupted. This method will stop the thread's execution and clear its state. Any use of a service client will cause the thread to be restarted.- Returns:
- true if an actual shutdown has been made; false otherwise.
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run
public void run()
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