--- /dev/null
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP : APPC
+ * ================================================================================
+ * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Copyright (C) 2017 Amdocs
+ * =============================================================================
+ * Licensed 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.
+ *
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.appc.configuration;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.text.DateFormat;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Optional;
+import java.util.Properties;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
+import org.onap.appc.i18n.Msg;
+import com.att.eelf.configuration.EELFLogger;
+import com.att.eelf.configuration.EELFManager;
+import com.att.eelf.i18n.EELFResourceManager;
+
+/**
+ * The configuration factory is used to obtain access to an already created and initialized
+ * singleton configuration object as well as to create and initialize the singleton if not already
+ * set up.
+ * <p>
+ * This class is responsible for the creation of the configuration object used to manage the
+ * configuration of the application. The configuration object implementation must implement the
+ * <code>Configuration</code> interface. This allows for the factory to create different
+ * specializations in the future if needed and not break any application code.
+ * </p>
+ * <p>
+ * The configuration object is basically a wrapper around a properties object. The configuration is
+ * therefore specified as a set of properties that are loaded and processed from different sources
+ * with different precedences. It is important that the configuration object always be able to
+ * supply default values for any configuration properties that must be supplied, and not rely on the
+ * user always supplying these values. This also relieves the application itself from having to
+ * interpret missing or invalid properties and applying defaults. By having all of the defaults in
+ * one place, the application code can be simpler (not having to worry about defaults or invalid
+ * properties), and the defaults can be changed much easier (they are all in one place and not
+ * distributed throughout the codebase).
+ * </p>
+ * <p>
+ * Since the configuration is managed as a property object, we can use a characteristic of the
+ * <code>Properties</code> class to our advantage. Namely, if we put a property into a
+ * <code>Properties</code> object that already exists, the <code>Properties</code> object replaces
+ * it with the new value. This does not affect any other properties that may already be defined in
+ * the properties object. This gives us the ability to initialize the properties with default values
+ * for all of the application settings, then override just those that we need to override, possibly
+ * from multiple sources and in increasing order of precedence.
+ * </p>
+ * <p>
+ * This means that properties are in effect "merged" together from multiple sources in a prescribed
+ * precedence order. In fact, the precedence order that this factory implements is defined as:
+ * </p>
+ * <ol>
+ * <li>Default values from a system resource file.</li>
+ * <li>User-supplied properties file, if any.</li>
+ * <li>Application-supplied properties, if any.</li>
+ * <li>Command-line properties (if any)</li>
+ * </ol>
+ * <p>
+ * The name and location of the properties file that is loaded can also be set, either in the
+ * defaults, overridden by the system command line via -D, or as a system environment variable.
+ * There are two properties that can be specified to define the name and path. These are:
+ * </p>
+ * <dl>
+ * <dt>org.onap.appc.bootstrap.file</dt>
+ * <dd>This property defines the name of the file that will be loaded. If not specified, the default
+ * value is "appc.properties". This can be specified in either (or both) the default properties or
+ * the command line. The command line specification will always override.</dd>
+ * <dt>org.onap.appc.bootstrap.path</dt>
+ * <dd>This is a comma-delimited (,) path of directories to be searched to locate the specified
+ * file. The first occurrence of the file is the one loaded, and no additional searching is
+ * performed. The path can be specified in either, or both, the default values and the command line
+ * specification. If specified on the command line, the value overrides the default values. If
+ * omitted, the default path is <code>$/opt/onap/appc/data/properties,${user.home},.</code></dd>
+ * </dl>
+ *
+ * @since Mar 18, 2014
+ * @version $Id$
+ */
+public final class ConfigurationFactory {
+
+ private static final EELFLogger logger = EELFManager.getInstance().getLogger(ConfigurationFactory.class);
+
+ /**
+ * This is a string constant for the comma character. It's intended to be used a common string
+ * delimiter.
+ */
+ private static final String COMMA = ",";
+
+ /**
+ * The default Configuration object that implements the <code>Configuration</code> interface and
+ * represents our system configuration settings.
+ */
+ private static DefaultConfiguration config = null;
+
+ /**
+ * The default properties resource to be loaded
+ */
+ private static final String DEFAULT_PROPERTIES = "org/onap/appc/default.properties";
+
+ /**
+ * This collection allows for special configurations to be created and maintained, organized by
+ * some identification (such as an object reference to the StackBuilder to which they apply),
+ * and then obtained from the configuration factory when needed.
+ */
+ private static HashMap<Object, Configuration> localConfigs = new HashMap<>();
+
+ /**
+ * The reentrant shared lock used to serialize access to the properties.
+ */
+ private static ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
+
+ /**
+ * This is a constant array of special property names that will be copied from the configuration
+ * back to the System properties object if they are defined in the configuration AND they do not
+ * already exist in the System properties object. These are intended as a convenience for
+ * setting the AFT properties for the Discovery client where it may be difficult or impossible
+ * to set VM arguments for the container.
+ */
+ private static final String[] specialProperties =
+ {"AFT_LATITUDE", "AFT_LONGITUDE", "AFT_ENVIRONMENT", "SCLD_PLATFORM"};
+
+ private ConfigurationFactory() {}
+
+ /**
+ * This method is used to obtain the common configuration object (as well as set it up if not
+ * already).
+ *
+ * @return The configuration object implementation
+ */
+ public static Configuration getConfiguration() {
+
+ /*
+ * First, attempt to access the properties as a read lock holder
+ */
+ ReadLock readLock = lock.readLock();
+ readLock.lock();
+ try {
+
+ /*
+ * If the properties don't exist, release the read lock and acquire the write lock. Once
+ * we get the write lock, we need to re-check to see that the configuration needs to be
+ * set up (because another thread may have beat us to it). After we get a configuration
+ * set up, release the write lock and re-obtain the read lock to access the properties.
+ */
+ if (config == null) {
+ readLock.unlock();
+ WriteLock writeLock = lock.writeLock();
+ writeLock.lock();
+ try {
+ if (config == null) {
+ config = new DefaultConfiguration();
+ initialize(null);
+ }
+ } catch (Exception e){
+ logger.error("getConfiguration", e);
+ } finally {
+ writeLock.unlock();
+ }
+ readLock.lock();
+ }
+ } finally {
+ readLock.unlock();
+ }
+ return config;
+ }
+
+ /**
+ * This method will obtain the local configuration for the specified object if it exists, or
+ * will create it from the current global configuration. This allows the configuration to be
+ * tailored for a specific process or operation, and uniquely identified by some value (such as
+ * the object that represents the special use of the configuration).
+ *
+ * @param owner The owner or identification of the owner of the special configuration
+ * @return The special configuration object, or a clone of the global configuration so that it
+ * can be altered if needed.
+ */
+ public static Configuration getConfiguration(final Object owner) {
+ DefaultConfiguration local;
+ ReadLock readLock = lock.readLock();
+ readLock.lock();
+ try {
+ local = (DefaultConfiguration) localConfigs.get(owner);
+ if (local == null) {
+ readLock.unlock();
+ WriteLock writeLock = lock.writeLock();
+ writeLock.lock();
+ local = (DefaultConfiguration) localConfigs.get(owner);
+ if (local == null) {
+ local = getClonedDefaultConfiguration(owner, local);
+ }
+ writeLock.unlock();
+ }
+ readLock.lock();
+ } finally {
+ readLock.unlock();
+ }
+ return local;
+ }
+
+ /**
+ * This method allows the caller to alter the configuration, supplying the specified
+ * configuration properties which override the application default values.
+ * <p>
+ * The configuration is re-constructed (if already constructed) or created new (if not already
+ * created) and the default properties are loaded into the configuration.
+ * </p>
+ * <p>
+ * The primary purpose of this method is to allow the application configuration properties to be
+ * reset or refreshed after the application has already been initialized. This method will lock
+ * the configuration for the duration while it is being re-built, and should not be called on a
+ * regular basis.
+ * </p>
+ *
+ * @param props The properties used to configure the application.
+ * @return Access to the configuration implementation
+ */
+ public static Configuration getConfiguration(final Properties props) {
+ WriteLock writeLock = lock.writeLock();
+ writeLock.lock();
+ try {
+ config = new DefaultConfiguration();
+ initialize(props);
+ return config;
+ } finally {
+ writeLock.unlock();
+ }
+ }
+
+ private static DefaultConfiguration getClonedDefaultConfiguration(Object owner, DefaultConfiguration local) {
+ Optional<DefaultConfiguration> global =
+ Optional.ofNullable((DefaultConfiguration) getConfiguration());
+ try {
+ if (global.isPresent()) {
+ local = (DefaultConfiguration) global.get().clone();
+ }
+ } catch (CloneNotSupportedException e) {
+ logger.error("getClonedDefaultConfiguration", e);
+ }
+ localConfigs.put(owner, local);
+ return local;
+ }
+
+ /**
+ * This method will clear the current configuration and then re-initialize it with the default
+ * values, application-specific configuration file, user-supplied properties (if any), and then
+ * command-line settings.
+ * <p>
+ * This method <strong><em>MUST</em></strong> be called holding the configuration lock!
+ * </p>
+ * <p>
+ * This method is a little special in that logging messages generated during the method must be
+ * cached and delayed until after the logging framework has been initialized. After that, the
+ * delayed logging buffer can be dumped to the log file and cleared.
+ * </p>
+ *
+ * @param props Application-supplied configuration values, if any
+ */
+ private static void initialize(final Properties props) {
+ DateFormat format = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG);
+ Date now = new Date();
+ logger.info(
+ "------------------------------------------------------------------------------");
+
+ logger.info(Msg.CONFIGURATION_STARTED, format.format(now));
+
+ /*
+ * Clear any existing properties
+ */
+ config.clear();
+ logger.info(Msg.CONFIGURATION_CLEARED);
+
+ /*
+ * Load the defaults (if any are present)
+ */
+ InputStream in = Thread.currentThread().getContextClassLoader()
+ .getResourceAsStream(DEFAULT_PROPERTIES);
+ if (in != null) {
+ logger.info(Msg.LOADING_DEFAULTS, DEFAULT_PROPERTIES);
+ try {
+ config.setProperties(in);
+ } finally {
+ try {
+ in.close();
+ } catch (IOException e) {
+ logger.error("Cannot close inputStream", e);
+ }
+ }
+ for (String key : config.getProperties().stringPropertyNames()) {
+ logger.info(Msg.PROPERTY_VALUE, key, config.getProperty(key));
+ }
+ } else {
+ logger.info(Msg.NO_DEFAULTS_FOUND, DEFAULT_PROPERTIES);
+ }
+
+ /*
+ * Look for application configuration property file. By default, we will look for the file
+ * "cdp.properties" on the user home path, then on "./etc" (relative to current path), then
+ * on "../etc" (relative to current path). If we do not find any property file, then we
+ * continue. Otherwise, we load the first property file we find and then continue. In order
+ * to allow default values for the filename and paths to be searched, we first attempt to
+ * obtain these from our configuration object (which should be primed with default values
+ * and/or overridden with application-specified values). We then use the values obtained
+ * from that to get any user supplied values on the command line.
+ */
+ String filename = config.getProperty(Configuration.PROPERTY_BOOTSTRAP_FILE_NAME,
+ Configuration.DEFAULT_BOOTSTRAP_FILE_NAME);
+ filename = System.getProperty(Configuration.PROPERTY_BOOTSTRAP_FILE_NAME, filename);
+ String env = System.getenv(Configuration.PROPERTY_BOOTSTRAP_FILE_NAME);
+ if (env != null && env.trim().length() > 0) {
+ filename = env;
+ }
+
+ String path = config.getProperty(Configuration.PROPERTY_BOOTSTRAP_FILE_PATH,
+ Configuration.DEFAULT_BOOTSTRAP_FILE_PATH);
+ path = System.getProperty(Configuration.PROPERTY_BOOTSTRAP_FILE_PATH, path);
+ env = System.getenv(Configuration.PROPERTY_BOOTSTRAP_FILE_PATH);
+ if (env != null && env.trim().length() > 0) {
+ path = env;
+ }
+
+ logger.info(Msg.SEARCHING_CONFIGURATION_OVERRIDES, path, filename);
+
+ String[] pathElements = path.split(COMMA);
+ boolean found = false;
+ for (String pathElement : pathElements) {
+ File file = new File(pathElement, filename);
+ if (file.exists() && file.canRead() && !file.isDirectory()) {
+
+ logger.info(Msg.LOADING_CONFIGURATION_OVERRIDES, file.getAbsolutePath());
+ Properties fileProperties = new Properties();
+ BufferedInputStream stream = null;
+ try {
+ stream = new BufferedInputStream(new FileInputStream(file));
+ fileProperties.load(stream);
+ for (String key : fileProperties.stringPropertyNames()) {
+ logger.debug(Msg.PROPERTY_VALUE, key, fileProperties.getProperty(key));
+ config.setProperty(key, fileProperties.getProperty(key));
+ }
+ found = true;
+ break;
+ } catch (IOException e) {
+ logger.error(EELFResourceManager.format(e));
+ } finally {
+ try {
+ if (stream != null) {
+ stream.close();
+ }
+ } catch (IOException e) {
+ logger.error("Unable to close stream", e);
+ }
+ }
+ }
+ }
+
+ if (!found) {
+ logger.warn(Msg.NO_OVERRIDE_PROPERTY_FILE_LOADED, filename, path);
+ }
+
+ /*
+ * Apply any application-specified properties
+ */
+ if (props != null) {
+ logger.info(Msg.LOADING_APPLICATION_OVERRIDES);
+ for (String key : props.stringPropertyNames()) {
+ logger.debug(Msg.PROPERTY_VALUE, key, props.getProperty(key));
+ config.setProperty(key, props.getProperty(key));
+ }
+ } else {
+ logger.info(Msg.NO_APPLICATION_OVERRIDES);
+ }
+
+ /*
+ * Merge in the System.properties to pick-up any command line arguments (-Dkeyword=value)
+ */
+ logger.info(Msg.MERGING_SYSTEM_PROPERTIES);
+ config.setProperties(System.getProperties());
+
+ /*
+ * As a convenience, copy the "specialProperties" that are not defined in System.properties
+ * from the configuration back to the system properties object.
+ */
+ for (String key : config.getProperties().stringPropertyNames()) {
+ for (String specialProperty : specialProperties) {
+ if (key.equals(specialProperty) && !System.getProperties().containsKey(key)) {
+ System.setProperty(key, config.getProperty(key));
+ logger.info(Msg.SETTING_SPECIAL_PROPERTY, key, config.getProperty(key));
+ }
+ }
+ }
+
+ /*
+ * Initialize the resource manager by loading the requested bundles, if any are defined.
+ * Resource bundles may be specified as a comma-delimited list of names. These resource
+ * names are base names of resource bundles, do not include the language or country code, or
+ * the ".properties" extension. The actual loading of the resource bundles is done lazily
+ * when requested the first time. If the bundle does not exist, or cannot be loaded, it is
+ * ignored.
+ */
+ String resourcesList = config.getProperty(Configuration.PROPERTY_RESOURCE_BUNDLES,
+ Configuration.DEFAULT_RESOURCE_BUNDLES);
+ String[] resources = resourcesList.split(",");
+ for (String resource : resources) {
+ logger.info(Msg.LOADING_RESOURCE_BUNDLE, resource.trim());
+ EELFResourceManager.loadMessageBundle(resource.trim());
+ }
+ }
+}
Code Review / appc.git / blobdiff