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Code Issues Releases Wiki Activity

smart select lock fair or unfair

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This commit is contained in:
wenshao
2012-10-23 10:08:37 +08:00
parent 4fc19f3343
commit 8d12edf752
2 changed files with 22 additions and 6 deletions
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src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
+21 -1
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@@ -38,6 +38,7 @@ import java.util.Properties;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Logger;
@@ -220,13 +221,18 @@ public abstract class DruidAbstractDataSource extends WrapperAdapter implements
protected boolean useOracleImplicitCache = true;
protected final ReentrantLock lock;
protected ReentrantLock lock;
protected Condition notEmpty;
protected Condition empty;
protected AtomicLong createCount = new AtomicLong();
protected AtomicLong destroyCount = new AtomicLong();
public DruidAbstractDataSource(boolean lockFair){
lock = new ReentrantLock(lockFair);
notEmpty = lock.newCondition();
empty = lock.newCondition();
}
public boolean isOracle() {
@@ -788,6 +794,20 @@ public abstract class DruidAbstractDataSource extends WrapperAdapter implements
return;
}
if (maxWaitMillis > 0 && !this.inited) {
final ReentrantLock lock = this.lock;
lock.lock();
try {
if ((!this.inited) && (!lock.isFair())) {
this.lock = new ReentrantLock(true);
this.notEmpty = this.lock.newCondition();
this.empty = this.lock.newCondition();
}
} finally {
lock.unlock();
}
}
if (inited) {
LOG.error("maxWait changed : " + this.maxWait + " -> " + maxWaitMillis);
}