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/*
* Copyright (C) 2014 Brett Wooldridge
*
* Licensed 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.
*/
package com.zaxxer.hikari.pool;
import com.zaxxer.hikari.util.ConcurrentBag.IConcurrentBagEntry;
import com.zaxxer.hikari.util.FastList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import static com.zaxxer.hikari.util.ClockSource.*;
/**
* Entry used in the ConcurrentBag to track Connection instances.
*
* @author Brett Wooldridge
*/
final class PoolEntry implements IConcurrentBagEntry
{
private static final Logger LOGGER = LoggerFactory.getLogger(PoolEntry.class);
private static final AtomicIntegerFieldUpdater<PoolEntry> stateUpdater;
Connection connection;
long lastAccessed;
long lastBorrowed;
@SuppressWarnings("FieldCanBeLocal")
private volatile int state = 0;
private volatile boolean evict;
private volatile ScheduledFuture<?> endOfLife;
private final FastList<Statement> openStatements;
private final HikariPool hikariPool;
private final boolean isReadOnly;
private final boolean isAutoCommit;
static
{
stateUpdater = AtomicIntegerFieldUpdater.newUpdater(PoolEntry.class, "state");
}
PoolEntry(final Connection connection, final PoolBase pool, final boolean isReadOnly, final boolean isAutoCommit)
{
this.connection = connection;
this.hikariPool = (HikariPool) pool;
this.isReadOnly = isReadOnly;
this.isAutoCommit = isAutoCommit;
this.lastAccessed = currentTime();
this.openStatements = new FastList<>(Statement.class, 16);
}
/**
* Release this entry back to the pool.
*
* @param lastAccessed last access time-stamp
*/
void recycle(final long lastAccessed)
{
if (connection != null) {
this.lastAccessed = lastAccessed;
hikariPool.recycle(this);
}
}
/**
* Set the end of life {@link ScheduledFuture}.
*
* @param endOfLife this PoolEntry/Connection's end of life {@link ScheduledFuture}
*/
void setFutureEol(final ScheduledFuture<?> endOfLife)
{
this.endOfLife = endOfLife;
}
Connection createProxyConnection(final ProxyLeakTask leakTask, final long now)
{
return ProxyFactory.getProxyConnection(this, connection, openStatements, leakTask, now, isReadOnly, isAutoCommit);
}
void resetConnectionState(final ProxyConnection proxyConnection, final int dirtyBits) throws SQLException
{
hikariPool.resetConnectionState(connection, proxyConnection, dirtyBits);
}
String getPoolName()
{
return hikariPool.toString();
}
boolean isMarkedEvicted()
{
return evict;
}
void markEvicted()
{
this.evict = true;
}
void evict(final String closureReason)
{
hikariPool.closeConnection(this, closureReason);
}
/** Returns millis since lastBorrowed */
long getMillisSinceBorrowed()
{
return elapsedMillis(lastBorrowed);
}
/** {@inheritDoc} */
@Override
public String toString()
{
final long now = currentTime();
return connection
+ ", accessed " + elapsedDisplayString(lastAccessed, now) + " ago, "
+ stateToString();
}
// ***********************************************************************
// IConcurrentBagEntry methods
// ***********************************************************************
/** {@inheritDoc} */
@Override
public int getState()
{
return stateUpdater.get(this);
}
/** {@inheritDoc} */
@Override
public boolean compareAndSet(int expect, int update)
{
return stateUpdater.compareAndSet(this, expect, update);
}
/** {@inheritDoc} */
@Override
public void setState(int update)
{
stateUpdater.set(this, update);
}
Connection close()
{
ScheduledFuture<?> eol = endOfLife;
if (eol != null && !eol.isDone() && !eol.cancel(false)) {
LOGGER.warn("{} - maxLifeTime expiration task cancellation unexpectedly returned false for connection {}", getPoolName(), connection);
}
Connection con = connection;
connection = null;
endOfLife = null;
return con;
}
private String stateToString()
{
switch (state) {
case STATE_IN_USE:
return "IN_USE";
case STATE_NOT_IN_USE:
return "NOT_IN_USE";
case STATE_REMOVED:
return "REMOVED";
case STATE_RESERVED:
return "RESERVED";
default:
return "Invalid";
}
}
}
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