Java tutorial
/* * Licensed to the Sakai Foundation (SF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The SF 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. */ package org.sakaiproject.nakamura.lite.storage; import com.google.common.collect.ImmutableSet; import org.apache.commons.pool.PoolableObjectFactory; import org.apache.commons.pool.impl.GenericObjectPool; import org.apache.felix.scr.annotations.Activate; import org.apache.felix.scr.annotations.Component; import org.apache.felix.scr.annotations.Deactivate; import org.apache.felix.scr.annotations.Property; import org.apache.felix.scr.annotations.Reference; import org.sakaiproject.nakamura.api.lite.ClientPoolException; import org.sakaiproject.nakamura.api.lite.Configuration; import org.sakaiproject.nakamura.api.lite.StorageClientUtils; import org.sakaiproject.nakamura.lite.types.StringType; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.Map; import java.util.Set; @Component(componentAbstract = true) public abstract class AbstractClientConnectionPool implements StorageClientPool { private static final Logger LOGGER = LoggerFactory.getLogger(AbstractClientConnectionPool.class); @Property(intValue = 200) private static final String MAX_ACTIVE = "max-active"; @Property(longValue = 10) private static final String MAX_WAIT = "max-wait"; @Property(intValue = 5) private static final String MAX_IDLE = "max-idle"; @Property(boolValue = true) private static final String TEST_ON_BORROW = "test-on-borrow"; @Property(boolValue = true) private static final String TEST_ON_RETURN = "test-on-return"; @Property(longValue = 60000) private static final String TIME_BETWEEN_EVICTION_RUNS_MILLIS = "time-between-eviction-run"; @Property(intValue = 1000) private static final String NUM_TESTS_PER_EVICTION_RUN = "num-tests-per-eviction-run"; @Property(longValue = 10000) private static final String MIN_EVICTABLE_IDLE_TIME_MILLIS = "min-evictable-idle-time-millis"; @Property(boolValue = false) private static final String TEST_WHILE_IDLE = "test-while-idle"; @Property(value = "grow") private static final String WHEN_EHAUSTED = "when-exhausted-action"; @Property(intValue = 0) private static final String LONG_STRING_SIZE = "long-string-size"; public static final String DEFAULT_FILE_STORE = "store"; @Property(value = "store") public static final String FS_STORE_BASE_DIR = "store-base-dir"; @Reference private Configuration configuration; private Set<String> indexColums; private GenericObjectPool pool; public AbstractClientConnectionPool() { } @Activate public void activate(Map<String, Object> properties) throws ClassNotFoundException { // for testing purposes if (configuration == null) { configuration = (Configuration) properties.get(Configuration.class.getName()); } indexColums = ImmutableSet.of(configuration.getIndexColumnNames()); int maxActive = StorageClientUtils.getSetting(properties.get(MAX_ACTIVE), 200); byte whenExhaustedAction = GenericObjectPool.DEFAULT_WHEN_EXHAUSTED_ACTION; String whenExhausted = (String) properties.get(WHEN_EHAUSTED); if ("fail".equals(whenExhausted)) { whenExhaustedAction = GenericObjectPool.WHEN_EXHAUSTED_FAIL; } else if ("grow".equals(whenExhausted)) { whenExhaustedAction = GenericObjectPool.WHEN_EXHAUSTED_GROW; } else if ("block".equals(whenExhausted)) { whenExhaustedAction = GenericObjectPool.WHEN_EXHAUSTED_BLOCK; } long maxWait = StorageClientUtils.getSetting(properties.get(MAX_WAIT), 10L); int maxIdle = StorageClientUtils.getSetting(properties.get(MAX_IDLE), 5); boolean testOnBorrow = StorageClientUtils.getSetting(properties.get(TEST_ON_BORROW), true); boolean testOnReturn = StorageClientUtils.getSetting(properties.get(TEST_ON_RETURN), true); long timeBetweenEvictionRunsMillis = StorageClientUtils .getSetting(properties.get(TIME_BETWEEN_EVICTION_RUNS_MILLIS), 60000L); int numTestsPerEvictionRun = StorageClientUtils.getSetting(properties.get(NUM_TESTS_PER_EVICTION_RUN), 1000); long minEvictableIdleTimeMillis = StorageClientUtils .getSetting(properties.get(MIN_EVICTABLE_IDLE_TIME_MILLIS), 10000L); boolean testWhileIdle = StorageClientUtils.getSetting(properties.get(TEST_WHILE_IDLE), false); pool = new GenericObjectPool(getConnectionPoolFactory(), maxActive, whenExhaustedAction, maxWait, maxIdle, testOnBorrow, testOnReturn, timeBetweenEvictionRunsMillis, numTestsPerEvictionRun, minEvictableIdleTimeMillis, testWhileIdle); // set the maximum size of a string, if this is not 0, strings over this size will become files. StringType.setLengthLimit(StorageClientUtils.getSetting(properties.get(LONG_STRING_SIZE), 0)); } protected abstract PoolableObjectFactory getConnectionPoolFactory(); @Deactivate public void deactivate(Map<String, Object> properties) { try { pool.clear(); pool.close(); LOGGER.debug("Sparse Map Content client pool closed "); } catch (Exception e) { LOGGER.error("Failed to close pool ", e); } } public Set<String> getIndexColumns() { return indexColums; } /* * (non-Javadoc) * * @see * org.sakaiproject.nakamura.lite.cassandra.ConnectionPool#openConnection() */ public StorageClient getClient() throws ClientPoolException { try { StorageClient client = (StorageClient) pool.borrowObject(); LOGGER.debug("Borrowed storage client pool client:" + client); return client; } catch (Exception e) { LOGGER.warn("Failed To Borrow connection from pool {} ", e.getMessage()); throw new ClientPoolException("Failed To Borrow connection from pool ", e); } } /* * (non-Javadoc) * * @see * org.sakaiproject.nakamura.lite.cassandra.ConnectionPool#closeConnection() */ public void releaseClient(StorageClient client) { try { if (client != null) { pool.returnObject(client); LOGGER.debug("Released storage client pool client:" + client); } } catch (Exception e) { LOGGER.warn("Failed to close connection " + e.getMessage(), e); } } }