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/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.impl.conn.tsccm;
import java.io.IOException;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import ch.boye.httpclientandroidlib.androidextra.HttpClientAndroidLog;
/* LogFactory removed by HttpClient for Android script. */
import ch.boye.httpclientandroidlib.annotation.GuardedBy;
import ch.boye.httpclientandroidlib.conn.ConnectionPoolTimeoutException;
import ch.boye.httpclientandroidlib.conn.OperatedClientConnection;
import ch.boye.httpclientandroidlib.conn.routing.HttpRoute;
import ch.boye.httpclientandroidlib.impl.conn.IdleConnectionHandler;
import ch.boye.httpclientandroidlib.util.Args;
/**
* An abstract connection pool.
* It is used by the {@link ThreadSafeClientConnManager}.
* The abstract pool includes a {@link #poolLock}, which is used to
* synchronize access to the internal pool datastructures.
* Don't use <code>synchronized</code> for that purpose!
*
* @since 4.0
*
* @deprecated (4.2) use {@link ch.boye.httpclientandroidlib.pool.AbstractConnPool}
*/
@Deprecated
public abstract class AbstractConnPool {
public HttpClientAndroidLog log;
/**
* The global lock for this pool.
*/
protected final Lock poolLock;
/** References to issued connections */
@GuardedBy("poolLock")
protected Set<BasicPoolEntry> leasedConnections;
/** The current total number of connections. */
@GuardedBy("poolLock")
protected int numConnections;
/** Indicates whether this pool is shut down. */
protected volatile boolean isShutDown;
protected Set<BasicPoolEntryRef> issuedConnections;
protected ReferenceQueue<Object> refQueue;
protected IdleConnectionHandler idleConnHandler;
/**
* Creates a new connection pool.
*/
protected AbstractConnPool() {
super();
this.log = new HttpClientAndroidLog(getClass());
this.leasedConnections = new HashSet<BasicPoolEntry>();
this.idleConnHandler = new IdleConnectionHandler();
this.poolLock = new ReentrantLock();
}
public void enableConnectionGC()
throws IllegalStateException {
}
/**
* Obtains a pool entry with a connection within the given timeout.
*
* @param route the route for which to get the connection
* @param timeout the timeout, 0 or negative for no timeout
* @param tunit the unit for the <code>timeout</code>,
* may be <code>null</code> only if there is no timeout
*
* @return pool entry holding a connection for the route
*
* @throws ConnectionPoolTimeoutException
* if the timeout expired
* @throws InterruptedException
* if the calling thread was interrupted
*/
public final
BasicPoolEntry getEntry(
final HttpRoute route,
final Object state,
final long timeout,
final TimeUnit tunit)
throws ConnectionPoolTimeoutException, InterruptedException {
return requestPoolEntry(route, state).getPoolEntry(timeout, tunit);
}
/**
* Returns a new {@link PoolEntryRequest}, from which a {@link BasicPoolEntry}
* can be obtained, or the request can be aborted.
*/
public abstract PoolEntryRequest requestPoolEntry(HttpRoute route, Object state);
/**
* Returns an entry into the pool.
* The connection of the entry is expected to be in a suitable state,
* either open and re-usable, or closed. The pool will not make any
* attempt to determine whether it can be re-used or not.
*
* @param entry the entry for the connection to release
* @param reusable <code>true</code> if the entry is deemed
* reusable, <code>false</code> otherwise.
* @param validDuration The duration that the entry should remain free and reusable.
* @param timeUnit The unit of time the duration is measured in.
*/
public abstract void freeEntry(BasicPoolEntry entry, boolean reusable, long validDuration, TimeUnit timeUnit)
;
public void handleReference(final Reference<?> ref) {
}
protected abstract void handleLostEntry(HttpRoute route);
/**
* Closes idle connections.
*
* @param idletime the time the connections should have been idle
* in order to be closed now
* @param tunit the unit for the <code>idletime</code>
*/
public void closeIdleConnections(final long idletime, final TimeUnit tunit) {
// idletime can be 0 or negative, no problem there
Args.notNull(tunit, "Time unit");
poolLock.lock();
try {
idleConnHandler.closeIdleConnections(tunit.toMillis(idletime));
} finally {
poolLock.unlock();
}
}
public void closeExpiredConnections() {
poolLock.lock();
try {
idleConnHandler.closeExpiredConnections();
} finally {
poolLock.unlock();
}
}
/**
* Deletes all entries for closed connections.
*/
public abstract void deleteClosedConnections();
/**
* Shuts down this pool and all associated resources.
* Overriding methods MUST call the implementation here!
*/
public void shutdown() {
poolLock.lock();
try {
if (isShutDown) {
return;
}
// close all connections that are issued to an application
final Iterator<BasicPoolEntry> iter = leasedConnections.iterator();
while (iter.hasNext()) {
final BasicPoolEntry entry = iter.next();
iter.remove();
closeConnection(entry.getConnection());
}
idleConnHandler.removeAll();
isShutDown = true;
} finally {
poolLock.unlock();
}
}
/**
* Closes a connection from this pool.
*
* @param conn the connection to close, or <code>null</code>
*/
protected void closeConnection(final OperatedClientConnection conn) {
if (conn != null) {
try {
conn.close();
} catch (final IOException ex) {
log.debug("I/O error closing connection", ex);
}
}
}
} // class AbstractConnPool
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