如何通过application.conf和c3p0.properties？
我已将Play 1.3应用程序配置为使用四个数据库（在三个不同的服务器上）。
有漏电连接的问题，这个问题已经部分解决了，我写了这个 -
现在我配置了c3p0连接池，想知道如何正确地完成它。
我在c3p0.properties目录中创建了conf文件。
c3p0.properties：
...
c3p0.acquireIncrement=5
c3p0.maxIdleTime=60
c3p0.maxIdleTimeExcessConnections=10
c3p0.maxPoolSize=200
c3p0.minPoolSize=20
c3p0.numHelperThreads=6
c3p0.unreturnedConnectionTimeout=30
...
在application.conf文件中，我评论了连接池设置：
...
# db.hardwareLayer.pool.timeout=10000
# db.hardwareLayer.pool.maxSize=500
# db.hardwareLayer.pool.minSize=100
# db.applicationLayer.pool.timeout=10000
# db.applicationLayer.pool.maxSize=500
# db.applicationLayer.pool.minSize=100
...
etc
现在我读了我的配置（仅用于测试）：
ComboPooledDataSource local = (ComboPooledDataSource) DB.datasource;
Logger.info("MaxConnectionAge: " +
local.getMaxConnectionAge());
Logger.info("MaxPoolSize: " +
local.getMaxPoolSize());
Logger.info("NumConnectionsAllUsers: " +
local.getNumConnectionsAllUsers());
Logger.info("NumConnectionsDefaultUsers: " +
local.getNumConnectionsDefaultUser());
Logger.info("NumBusyConnectionsAllUsers: " +
local.getNumBusyConnectionsAllUsers());
Logger.info("NumBusyConnectionsDefaultUser: " +
local.getNumBusyConnectionsDefaultUser());
Logger.info("LastCheckinFailureDefaultUser: " +
local.getLastCheckinFailureDefaultUser());
Logger.info("NumFailedCheckinsDefaultUser: " +
local.getNumFailedCheckinsDefaultUser());
Logger.info("NumFailedCheckoutsDefaultUser: " +
local.getNumFailedCheckoutsDefaultUser());
Logger.info("NumIdleConnectionsAllUser: " +
local.getNumIdleConnectionsAllUsers());
Logger.info("NumIdleConnectionsDefaultUser: " +
local.getNumIdleConnectionsDefaultUser());
Logger.info("UnreturnedConnectionTimeout: " +
local.getUnreturnedConnectionTimeout());
Logger.info("NumUnclosedOrphanedConnectionsAllUsers: " +
local.getNumUnclosedOrphanedConnectionsAllUsers());
Logger.info("NumUnclosedOrphanedConnectionsDefaultUsers: " +
local.getNumUnclosedOrphanedConnectionsDefaultUser());
这给出了：
20:10:04,432 INFO ~ MaxConnectionAge: 0
20:10:04,432 INFO ~ MaxPoolSize: 30
20:10:04,432 INFO ~ NumConnectionsAllUsers: 1
20:10:04,432 INFO ~ NumConnectionsDefaultUsers: 1
20:10:04,432 INFO ~ NumBusyConnectionsAllUsers: 1
20:10:04,432 INFO ~ NumBusyConnectionsDefaultUser: 1
20:10:04,432 INFO ~ LastCheckinFailureDefaultUser: null
20:10:04,432 INFO ~ NumFailedCheckinsDefaultUser: 0
20:10:04,432 INFO ~ NumFailedCheckoutsDefaultUser: 0
20:10:04,432 INFO ~ NumIdleConnectionsAllUser: 0
20:10:04,432 INFO ~ NumIdleConnectionsDefaultUser: 0
20:10:04,432 INFO ~ UnreturnedConnectionTimeout: 30
20:10:04,432 INFO ~ NumUnclosedOrphanedConnectionsAllUsers: 0
20:10:04,432 INFO ~ NumUnclosedOrphanedConnectionsDefaultUsers: 0
除unreturnedConnectionTimeout之外，几乎所有设置都是默认设置，我在文件c3p0.properties中设置。
默认设置在框架的源代码中定义 -
DBConfig.java的相关部分：
ComboPooledDataSource ds = new ComboPooledDataSource();
ds.setDriverClass(p.getProperty(propsPrefix+".driver"));
ds.setJdbcUrl(p.getProperty(propsPrefix + ".url"));
ds.setUser(p.getProperty(propsPrefix + ".user"));
ds.setPassword(p.getProperty(propsPrefix + ".pass"));
ds.setAcquireRetryAttempts(10);
ds.setCheckoutTimeout(Integer.parseInt(p.getProperty(propsPrefix + ".pool.timeout", "5000")));
ds.setBreakAfterAcquireFailure(false);
ds.setMaxPoolSize(Integer.parseInt(p.getProperty(propsPrefix + ".pool.maxSize", "30")));
ds.setMinPoolSize(Integer.parseInt(p.getProperty(propsPrefix + ".pool.minSize", "1")));
ds.setMaxIdleTimeExcessConnections(Integer.parseInt(p.getProperty(propsPrefix + ".pool.maxIdleTimeExcessConnections", "0")));
ds.setIdleConnectionTestPeriod(10);
ds.setTestConnectionOnCheckin(true);
然后我检查连接池：
SELECT
dbExecConnections.session_id,
dbExecSessions.status,
/*client_net_address,*/
program_name,
host_process_id,
login_name
FROM
sys.dm_exec_connections dbExecConnections
JOIN sys.dm_exec_sessions dbExecSessions
ON dbExecConnections.session_id = dbExecSessions.session_id
CROSS APPLY sys.dm_exec_sql_text(dbExecConnections.most_recent_sql_handle) AS dest
然后我对我的应用程序进行了一次小的DDoS攻击。故障与应用程序的正常工作交替进行，并且在一段时间后系统稳定（由于参数unreturnedConnectionTimeout）：
20:29:32,317 ERROR ~ An attempt by a client to checkout a Connection has timed o
ut.
20:29:32,363 ERROR ~
@6mebbn9f8
Internal Server Error (500) for request POST /api/devices/kladr/levelthree
Oops: PersistenceException
An unexpected error occured caused by exception PersistenceException: org.hibern
ate.exception.GenericJDBCException: Could not open connection
play.exceptions.UnexpectedException: Unexpected Error
at play.Invoker$Invocation.onException(Invoker.java:244)
at play.Invoker$Invocation.run(Invoker.java:306)
... 14 more
20:29:39,520 DEBUG ~ select kladr0_.CODE as CODE1_0_, kladr0_.GNIMB as GNIMB2_0_
, kladr0_.[INDEX] as INDEX3_0_, kladr0_.NAME as NAME4_0_, kladr0_.OCATD as OCATD
5_0_, kladr0_.SOCR as SOCR6_0_, kladr0_.Status as Status7_0_, kladr0_.UNO as UNO
8_0_ from KLADR kladr0_ where kladr0_.CODE like '%63023_00____%'
20:29:40,227 DEBUG ~ select kladr0_.CODE as CODE1_0_, kladr0_.GNIMB as GNIMB2_0_
, kladr0_.[INDEX] as INDEX3_0_, kladr0_.NAME as NAME4_0_, kladr0_.OCATD as OCATD
5_0_, kladr0_.SOCR as SOCR6_0_, kladr0_.Status as Status7_0_, kladr0_.UNO as UNO
8_0_ from KLADR kladr0_ where kladr0_.CODE like '%63024_00____%'
20:29:45,900 WARN ~ SQL Error: 0, SQLState: null
20:29:45,900 ERROR ~ An attempt by a client to checkout a Connection has timed o
ut.
20:29:45,932 ERROR ~
@6mebbn9fa
Internal Server Error (500) for request POST /api/devices/kladr/levelthree
Oops: PersistenceException
An unexpected error occured caused by exception PersistenceException: org.hibern
ate.exception.GenericJDBCException: Could not open connection
play.exceptions.UnexpectedException: Unexpected Error
at play.Invoker$Invocation.onException(Invoker.java:244)
... 14 more
20:29:46,236 DEBUG ~ select kladr0_.CODE as CODE1_0_, kladr0_.GNIMB as GNIMB2_0_
, kladr0_.[INDEX] as INDEX3_0_, kladr0_.NAME as NAME4_0_, kladr0_.OCATD as OCATD
5_0_, kladr0_.SOCR as SOCR6_0_, kladr0_.Status as Status7_0_, kladr0_.UNO as UNO
8_0_ from KLADR kladr0_ where kladr0_.CODE like '%63026_00____%'
20:29:52,873 DEBUG ~ select kladr0_.CODE as CODE1_0_, kladr0_.GNIMB as GNIMB2_0_
, kladr0_.[INDEX] as INDEX3_0_, kladr0_.NAME as NAME4_0_, kladr0_.OCATD as OCATD
5_0_, kladr0_.SOCR as SOCR6_0_, kladr0_.Status as Status7_0_, kladr0_.UNO as UNO
8_0_ from KLADR kladr0_ where kladr0_.CODE like '%63027_00____%'
20:29:53,491 DEBUG ~ select kladr0_.CODE as CODE1_0_, kladr0_.GNIMB as GNIMB2_0_
, kladr0_.[INDEX] as INDEX3_0_, kladr0_.NAME as NAME4_0_, kladr0_.OCATD as OCATD
5_0_, kladr0_.SOCR as SOCR6_0_, kladr0_.Status as Status7_0_, kladr0_.UNO as UNO
8_0_ from KLADR kladr0_ where kladr0_.CODE like '%63028_00____%'
20:29:54,090 DEBUG ~ select kladr0_.CODE as CODE1_0_, kladr0_.GNIMB as GNIMB2_0_
, kladr0_.[INDEX] as INDEX3_0_, kladr0_.NAME as NAME4_0_, kladr0_.OCATD as OCATD
这一切都很好。
但是如何在一个文件中收集所有必要的配置？如果我在application.conf中取消注释池设置：
20:32:44,908 INFO ~ MaxConnectionAge: 0
20:32:44,908 INFO ~ MaxPoolSize: 500
20:32:44,909 INFO ~ NumConnectionsAllUsers: 100
20:32:44,909 INFO ~ NumConnectionsDefaultUsers: 100
20:32:44,910 INFO ~ NumBusyConnectionsAllUsers: 15
20:32:44,910 INFO ~ NumBusyConnectionsDefaultUser: 15
20:32:44,910 INFO ~ LastCheckinFailureDefaultUser: null
20:32:44,910 INFO ~ NumFailedCheckinsDefaultUser: 0
20:32:44,910 INFO ~ NumFailedCheckoutsDefaultUser: 0
20:32:44,910 INFO ~ NumIdleConnectionsAllUser: 85
20:32:44,910 INFO ~ NumIdleConnectionsDefaultUser: 85
20:32:44,910 INFO ~ UnreturnedConnectionTimeout: 30
20:32:44,910 INFO ~ NumUnclosedOrphanedConnectionsAllUsers: 0
20:32:44,910 INFO ~ NumUnclosedOrphanedConnectionsDefaultUsers: 0
从application.conf读取一些设置，其中一些来自c3p0.properties。
我将非常感谢这些信息。谢谢大家。
1 个答案:
答案 0 :(得分：2)
播放1.x仅支持通过application.conf配置c3p0选项的子集。如果您想要任何其他的非默认值，那么您将不得不维护一个c3p0.properties文件。
由于c3p0＆＃39; Precedence of Configuration Settings以及Play以编程方式设置可以使用application.conf配置的属性这一事实 - 您无法使用c3p0。属性文件，用于设置播放支持的选项。
所以 - 对于您尝试实现的配置，您需要在两个文件中维护数据源配置设置（或fork Play以获得您想要的内容）。
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