openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-core/src/main/java/org/openecomp/core/zusammen/impl/CassandraConnectionInitializer.java

   1 /*
   2  * Copyright © 2016-2017 European Support Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.openecomp.core.zusammen.impl;
  18
  19 import java.util.function.Supplier;
  20 import org.apache.commons.lang3.StringUtils;
  21 import org.openecomp.core.nosqldb.util.CassandraUtils;
  22
  23 public class CassandraConnectionInitializer {
  24
  25     private static final String CASSANDRA_PREFIX = "cassandra.";
  26     private static final String DATA_CENTER_PROPERTY_NAME = CASSANDRA_PREFIX + "datacenter";
  27     private static final String CONSISTENCY_LEVEL_PROPERTY_NAME =
  28             CASSANDRA_PREFIX + "consistency.level";
  29     private static final String NODES_PROPERTY_NAME = CASSANDRA_PREFIX + "nodes";
  30     private static final String AUTHENTICATE_PROPERTY_NAME = CASSANDRA_PREFIX + "authenticate";
  31     private static final String SSL_PROPERTY_NAME = CASSANDRA_PREFIX + "ssl";
  32     private static final String TRUSTSTORE_PROPERTY_NAME = CASSANDRA_PREFIX + "truststore";
  33     private static final String TRUSTSTORE_PASSWORD_PROPERTY_NAME =
  34             CASSANDRA_PREFIX + "truststore.password";
  35     private static final String USER_PROPERTY_NAME = CASSANDRA_PREFIX + "user";
  36     private static final String PASSWORD_PROPERTY_NAME = CASSANDRA_PREFIX + "password";
  37     private static final String KEYSPACE_PROPERTY_NAME = CASSANDRA_PREFIX + "keyspace";
  38     private static final String ZUSAMMEN = "zusammen";
  39
  40     private CassandraConnectionInitializer() {
  41         // static utility class, prevent instantiation
  42     }
  43
  44     public static void setCassandraConnectionPropertiesToSystem() {
  45         DeferredInitializer.init();
  46     }
  47
  48     private static class DeferredInitializer {
  49
  50         static {
  51             setSystemProperty(NODES_PROPERTY_NAME, () ->
  52                                                            StringUtils.join(CassandraUtils.getAddresses(), ','));
  53             setBooleanSystemProperty(AUTHENTICATE_PROPERTY_NAME, CassandraUtils::isAuthenticate);
  54             setBooleanSystemProperty(SSL_PROPERTY_NAME, CassandraUtils::isSsl);
  55             setSystemProperty(TRUSTSTORE_PROPERTY_NAME, CassandraUtils::getTruststore);
  56             setSystemProperty(TRUSTSTORE_PASSWORD_PROPERTY_NAME, CassandraUtils::getTruststorePassword);
  57             setSystemProperty(USER_PROPERTY_NAME, CassandraUtils::getUser);
  58             setSystemProperty(PASSWORD_PROPERTY_NAME, CassandraUtils::getPassword);
  59             setSystemProperty(KEYSPACE_PROPERTY_NAME, () -> ZUSAMMEN);
  60             setNullableSystemProperty(DATA_CENTER_PROPERTY_NAME, CassandraUtils::getLocalDataCenter);
  61             setNullableSystemProperty(CONSISTENCY_LEVEL_PROPERTY_NAME,
  62                     CassandraUtils::getConsistencyLevel);
  63         }
  64
  65         private DeferredInitializer() { }
  66
  67         @SuppressWarnings("EmptyMethod")
  68         static void init() {
  69             // no-op, just to ensure static initialization
  70         }
  71
  72         private static void setSystemProperty(String name, Supplier<String> valueSupplier) {
  73
  74             if (System.getProperty(name) == null) {
  75                 System.setProperty(name, valueSupplier.get());
  76             }
  77         }
  78
  79         private static void setBooleanSystemProperty(String name, Supplier<Boolean> valueSupplier) {
  80             setSystemProperty(name, () -> Boolean.toString(valueSupplier.get()));
  81         }
  82
  83         private static void setNullableSystemProperty(String name, Supplier<String> valueSupplier) {
  84
  85             if ((System.getProperty(name) == null) && (valueSupplier.get() != null)) {
  86                 System.setProperty(name, valueSupplier.get());
  87             }
  88         }
  89     }
  90 }