Example usage for java.util.concurrent.locks Lock lock

Introduction

In this page you can find the example usage for java.util.concurrent.locks Lock lock.

Prototype

lock

Source Link

Usage

From source file:gridool.db.sql.ParallelSQLExecJob.java

private static void createMergeView(@Nonnull final Connection conn, @Nonnull final String ddl,
        @Nonnull final ReadWriteLock rwlock) throws GridException {
    if (LOG.isInfoEnabled()) {
        LOG.info("Create a merge view: \n" + ddl);
    }//from   w  ww.j a v a2s  . c  om
    final Lock wlock = rwlock.writeLock();
    try {
        wlock.lock();
        JDBCUtils.update(conn, ddl);
    } catch (SQLException e) {
        String errmsg = "failed running a reduce query: " + ddl;
        LOG.error(errmsg, e);
        try {
            conn.rollback();
        } catch (SQLException rbe) {
            LOG.warn("Rollback failed", rbe);
        }
        throw new GridException(errmsg, e);
    } finally {
        wlock.unlock();
    }
}

From source file:gridool.db.sql.ParallelSQLExecJob.java

private static void runPreparation(@Nonnull final DBAccessor dba, @Nonnull final String mapQuery,
        @Nonnull final GridNode[] masters, @Nonnull final GridNode localNode,
        @Nonnull final ReadWriteLock rwlock, @Nonnull final String outputName) throws GridException {
    final String prepareQuery = constructTaskResultTablesDDL(mapQuery, masters, localNode, outputName);
    final Connection conn;
    try {//ww w  .jav a2 s . c  om
        conn = dba.getPrimaryDbConnection();
        conn.setAutoCommit(false);
    } catch (SQLException e) {
        LOG.error("An error caused in the preparation phase", e);
        throw new GridException(e);
    }
    final Lock wlock = rwlock.writeLock();
    try {
        wlock.lock();
        JDBCUtils.update(conn, prepareQuery);
        conn.commit();
    } catch (SQLException e) {
        LOG.error("An error caused in the preparation phase", e);
        try {
            conn.rollback();
        } catch (SQLException sqle) {
            LOG.warn("Failed to rollback", sqle);
        }
        throw new GridException(e);
    } finally {
        wlock.unlock();
        JDBCUtils.closeQuietly(conn);
    }
}

From source file:StripedHashSet.java

/**
 * double the set size//  ww w  .  j av a 2 s  .  c o  m
 */
@Override
public void resize() {
    int oldCapacity = table.length;
    for (Lock lock : locks) {
        lock.lock();
    }
    try {
        if (oldCapacity != table.length) {
            return; // someone beat us to it
        }
        int newCapacity = 2 * oldCapacity;
        List<T>[] oldTable = table;
        table = (List<T>[]) new List[newCapacity];
        for (int i = 0; i < newCapacity; i++)
            table[i] = new ArrayList<T>();
        initializeFrom(oldTable);
    } finally {
        for (Lock lock : locks) {
            lock.unlock();
        }
    }
}

From source file:gridool.db.sql.ParallelSQLExecJob.java

private static String invokeReduceDDL(final Connection conn, final String reduceQuery,
        final String outputTableName, final OutputMethod outputMethod, final ReadWriteLock rwlock)
        throws GridException {
    final String query;
    if (outputMethod == OutputMethod.view) {
        query = "CREATE VIEW \"" + outputTableName + "\" AS (\n" + reduceQuery + ')';
    } else if (outputMethod == OutputMethod.table) {
        query = "CREATE TABLE \"" + outputTableName + "\" AS (\n" + reduceQuery + ") WITH DATA";
    } else {//from  w ww  . j a v  a 2s .  com
        throw new IllegalStateException("Unexpected OutputMethod: " + outputMethod);
    }
    if (LOG.isInfoEnabled()) {
        LOG.info("Executing a Reduce SQL query: \n" + query);
    }
    final Lock wlock = rwlock.writeLock();
    try {
        wlock.lock();
        JDBCUtils.update(conn, query);
    } catch (SQLException e) {
        String errmsg = "failed running a reduce query: " + query;
        LOG.error(errmsg, e);
        try {
            conn.rollback();
        } catch (SQLException rbe) {
            LOG.warn("Rollback failed", rbe);
        }
        throw new GridException(errmsg, e);
    } finally {
        wlock.unlock();
    }
    return outputTableName;
}

From source file:de.taimos.daemon.spring.SpringDaemonAdapter.java

/**
 * @return the Spring context//  w  ww .ja va2  s. co m
 */
public final ApplicationContext getContext() {
    Lock readLock = this.rwLock.readLock();
    try {
        readLock.lock();
        return this.context.get();
    } finally {
        readLock.unlock();
    }
}

From source file:gridool.db.sql.ParallelSQLExecJob.java

private static String invokeStringOutputReduce(final Connection conn, final String reduceQuery,
        final ReadWriteLock rwlock) throws GridException {
    final ResultSetHandler rsh = new ResultSetHandler() {
        public String handle(ResultSet rs) throws SQLException {
            if (rs.next()) {
                String firstResult = rs.getString(1);
                return firstResult;
            }/* w  w  w .j a v a2s  .c o m*/
            return null;
        }
    };

    if (LOG.isInfoEnabled()) {
        LOG.info("Executing a Reduce SQL query: \n" + reduceQuery);
    }
    final String result;
    final Lock rlock = rwlock.readLock();
    try {
        rlock.lock();
        conn.setReadOnly(true);
        result = (String) JDBCUtils.query(conn, reduceQuery, rsh);
    } catch (SQLException e) {
        String errmsg = "failed running a reduce query: " + reduceQuery;
        LOG.error(errmsg, e);
        try {
            conn.rollback();
        } catch (SQLException rbe) {
            LOG.warn("Rollback failed", rbe);
        }
        throw new GridException(errmsg, e);
    } finally {
        rlock.unlock();
    }
    return result;
}

From source file:cherry.foundation.numbering.SimpleNumberingStore.java

@Override
public synchronized long loadAndLock(String numberName) {
    Lock lock = lockMap.get(numberName);
    if (lock == null) {
        lock = new ReentrantLock(true);
        lockMap.put(numberName, lock);//from  w w  w  . j  av  a  2s .c o m
    }
    lock.lock();
    return currentValueMap.get(numberName).longValue();
}

From source file:org.codehaus.wadi.location.partitionmanager.local.BasicLocalPartition.java

public void onMessage(Envelope message, InsertIMToPM request) {
    Lock readLock = readWriteLock.readLock();
    readLock.lock();
    try {/*from  ww w . java  2 s  .c  o  m*/
        LocalPartitionInsertIMToPMAction action = new LocalPartitionInsertIMToPMAction(dispatcher,
                nameToLocation, log);
        action.onMessage(message, request);
    } finally {
        readLock.unlock();
    }
}

From source file:org.codehaus.wadi.location.partitionmanager.local.BasicLocalPartition.java

public void onMessage(Envelope message, DeleteIMToPM request) {
    Lock readLock = readWriteLock.readLock();
    readLock.lock();
    try {/*  ww  w .j a  va2s . c o  m*/
        LocalPartitionDeleteIMToPMAction action = new LocalPartitionDeleteIMToPMAction(dispatcher,
                nameToLocation, log);
        action.onMessage(message, request);
    } finally {
        readLock.unlock();
    }
}

From source file:org.codehaus.wadi.location.partitionmanager.local.BasicLocalPartition.java

public void onMessage(Envelope message, MoveIMToPM request) {
    Lock readLock = readWriteLock.readLock();
    readLock.lock();
    try {/*from  ww w .  ja v a  2 s.c  o  m*/
        LocalPartitionMoveIMToPMAction action = new LocalPartitionMoveIMToPMAction(dispatcher, nameToLocation,
                log);
        action.onMessage(message, request);
    } finally {
        readLock.unlock();
    }
}