com.sun.grizzly.connectioncache.impl.transport.InboundConnectionCacheBlockingImpl Maven / Gradle / Ivy
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package com.sun.grizzly.connectioncache.impl.transport;
import com.sun.grizzly.connectioncache.spi.concurrent.ConcurrentQueue;
import com.sun.grizzly.connectioncache.spi.transport.InboundConnectionCache;
import java.io.Closeable;
import java.io.IOException ;
import java.util.logging.Logger ;
import java.util.Map ;
import java.util.HashMap ;
/** Manage connections that are initiated from another VM.
*
* @param C a connection
* @author Ken Cavanaugh
*/
public final class InboundConnectionCacheBlockingImpl
extends ConnectionCacheBlockingBase
implements InboundConnectionCache {
private final Map> connectionMap ;
protected String thisClassName() {
return "InboundConnectionCacheBlockingImpl" ;
}
private static final class ConnectionState {
final C connection ; // Connection of the
// ConnectionState
int busyCount ; // Number of calls to
// get without release
int expectedResponseCount ; // Number of expected
// responses not yet
// received
ConcurrentQueue.Handle reclaimableHandle ; // non-null iff connection
// is not in use and has no
// outstanding requests
ConnectionState( final C conn ) {
this.connection = conn ;
busyCount = 0 ;
expectedResponseCount = 0 ;
reclaimableHandle = null ;
}
}
public InboundConnectionCacheBlockingImpl( final String cacheType,
final int highWaterMark, final int numberToReclaim,
Logger logger ) {
super( cacheType, highWaterMark, numberToReclaim, logger ) ;
this.connectionMap = new HashMap>() ;
if (debug()) {
dprint(".constructor completed: " + getCacheType() );
}
}
// We do not need to define equals or hashCode for this class.
public synchronized void requestReceived( final C conn ) {
if (debug())
dprint( "->requestReceived: connection " + conn ) ;
try {
ConnectionState cs = getConnectionState( conn ) ;
final int totalConnections = totalBusy + totalIdle ;
if (totalConnections > highWaterMark())
reclaim() ;
ConcurrentQueue.Handle reclaimHandle = cs.reclaimableHandle ;
if (reclaimHandle != null) {
if (debug())
dprint( ".requestReceived: " + conn
+ " removed from reclaimableQueue" ) ;
reclaimHandle.remove() ;
}
int count = cs.busyCount++ ;
if (count == 0) {
if (debug())
dprint( ".requestReceived: " + conn
+ " transition from idle to busy" ) ;
totalIdle-- ;
totalBusy++ ;
}
} finally {
if (debug())
dprint( "<-requestReceived: connection " + conn ) ;
}
}
public synchronized void requestProcessed( final C conn,
final int numResponsesExpected ) {
if (debug())
dprint( "->requestProcessed: connection " + conn
+ " expecting " + numResponsesExpected + " responses" ) ;
try {
final ConnectionState cs = connectionMap.get( conn ) ;
if (cs == null) {
if (debug())
dprint( ".release: connection " + conn + " was closed" ) ;
return ;
} else {
cs.expectedResponseCount += numResponsesExpected ;
int numResp = cs.expectedResponseCount ;
int numBusy = --cs.busyCount ;
if (debug()) {
dprint( ".release: " + numResp + " responses expected" ) ;
dprint( ".release: " + numBusy +
" busy count for connection" ) ;
}
if (numBusy == 0) {
totalBusy-- ;
totalIdle++ ;
if (numResp == 0) {
if (debug())
dprint( ".release: "
+ "queuing reclaimable connection "
+ conn ) ;
if ((totalBusy+totalIdle) > highWaterMark()) {
close( conn ) ;
} else {
cs.reclaimableHandle =
reclaimableConnections.offer( conn ) ;
}
}
}
}
} finally {
if (debug())
dprint( "<-requestProcessed" ) ;
}
}
/** Decrement the number of expected responses. When a connection is idle
* and has no expected responses, it can be reclaimed.
* @param conn a connection
*/
public synchronized void responseSent( final C conn ) {
if (debug())
dprint( "->responseSent: " + conn ) ;
try {
final ConnectionState cs = connectionMap.get( conn ) ;
if (cs == null) {
if (debug())
dprint( ".release: connection " + conn + " was closed" ) ;
return ;
}
final int waitCount = --cs.expectedResponseCount ;
if (waitCount == 0) {
if (debug())
dprint( ".responseSent: " + conn + " is now reclaimable" ) ;
if ((totalBusy+totalIdle) > highWaterMark()) {
if (debug()) {
dprint( ".responseSent: " + conn
+ " closing connection" ) ;
}
close( conn ) ;
} else {
cs.reclaimableHandle =
reclaimableConnections.offer( conn ) ;
if (debug()) {
dprint( ".responseSent: " + conn
+ " is now reclaimable" ) ;
}
}
} else {
if (debug()) {
dprint( ".responseSent: " + conn + " waitCount="
+ waitCount ) ;
}
}
} finally {
if (debug()) {
dprint( "<-responseSent: " + conn ) ;
}
}
}
/** Close a connection, regardless of whether the connection is busy
* or not.
* @param conn a connection
*/
public synchronized void close( final C conn ) {
if (debug())
dprint( "->close: " + conn ) ;
try {
final ConnectionState cs = connectionMap.remove( conn ) ;
if (cs != null) {
int count = cs.busyCount ;
if (debug())
dprint( ".close: " + conn + " count = " + count ) ;
if (count == 0)
totalIdle-- ;
else
totalBusy-- ;
final ConcurrentQueue.Handle rh = cs.reclaimableHandle ;
if (rh != null) {
if (debug())
dprint( ".close: " + conn + " connection was reclaimable" ) ;
rh.remove() ;
}
try {
conn.close() ;
} catch (IOException exc) {
if (debug())
dprint( ".close: " + conn + " close threw " + exc ) ;
}
}
} finally {
if (debug())
dprint( "<-close: " + conn ) ;
}
}
// Atomically either get the ConnectionState for conn OR
// create a new one AND put it in the cache
private ConnectionState getConnectionState( C conn ) {
// This should be the only place a CacheEntry is constructed.
if (debug())
dprint( "->getConnectionState: " + conn ) ;
try {
ConnectionState result = connectionMap.get( conn ) ;
if (result == null) {
if (debug())
dprint( ".getConnectionState: " + conn +
" creating new ConnectionState instance" ) ;
result = new ConnectionState( conn ) ;
connectionMap.put( conn, result ) ;
totalIdle++ ;
}
return result ;
} finally {
if (debug())
dprint( "<-getConnectionState: " + conn ) ;
}
}
}
// End of file.
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