| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.camel.core.osgi; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.camel.CamelContext; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.InvalidSyntaxException; |
| import org.osgi.framework.ServiceReference; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A helper to find free names in the OSGi service registry. |
| */ |
| public final class OsgiNamingHelper { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(OsgiNamingHelper.class); |
| |
| private OsgiNamingHelper() { |
| } |
| |
| /** |
| * Checks the OSGi service registry for a free name (uses the counter if there is a clash to find next free name) |
| * |
| * @param context the bundle context |
| * @param prefix the prefix for the name |
| * @param key the key to use in the OSGi filter; either {@link OsgiCamelContextPublisher#CONTEXT_NAME_PROPERTY} |
| * or {@link OsgiCamelContextPublisher#CONTEXT_MANAGEMENT_NAME_PROPERTY}. |
| * @param counter the counter |
| * @param checkFirst <tt>true</tt> to check the prefix name as-is before using the counter, <tt>false</tt> the counter is used immediately |
| * @return the free name, is never <tt>null</tt> |
| */ |
| public static String findFreeCamelContextName(BundleContext context, String prefix, String key, AtomicInteger counter, boolean checkFirst) { |
| String candidate = null; |
| boolean clash = false; |
| |
| do { |
| try { |
| clash = false; |
| |
| if (candidate == null && checkFirst) { |
| // try candidate as-is |
| candidate = prefix; |
| } else { |
| // generate new candidate |
| candidate = prefix + "-" + getNextCounter(counter); |
| } |
| LOG.trace("Checking OSGi Service Registry for existence of existing CamelContext with name: {}", candidate); |
| |
| ServiceReference<?>[] refs = context.getServiceReferences(CamelContext.class.getName(), "(" + key + "=" + candidate + ")"); |
| if (refs != null && refs.length > 0) { |
| for (ServiceReference<?> ref : refs) { |
| Object id = ref.getProperty(key); |
| if (id != null && candidate.equals(id)) { |
| clash = true; |
| break; |
| } |
| } |
| } |
| } catch (InvalidSyntaxException e) { |
| LOG.debug("Error finding free Camel name in OSGi Service Registry due " + e.getMessage() + ". This exception is ignored.", e); |
| break; |
| } |
| } while (clash); |
| |
| LOG.debug("Generated free name for bundle id: {}, clash: {} -> {}", context.getBundle().getBundleId(), clash, candidate); |
| return candidate; |
| } |
| |
| public static int getNextCounter(AtomicInteger counter) { |
| // we want to start counting from 1, so increment first |
| return counter.incrementAndGet(); |
| } |
| |
| } |