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Apache HttpComponents Client (OSGi bundle)
/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* registeredConfigurations = new LinkedHashMap();
private final List proxyConfigurations = new CopyOnWriteArrayList();
private final HttpClientTracker httpClientTracker = new HttpClientTracker();
/**
* {@inheritDoc}
*/
@Override
public void start(final BundleContext context) throws Exception {
this.context = context;
// ensure we receive configurations for the proxy selector
final Hashtable props = new Hashtable();
props.put(Constants.SERVICE_PID, getName());
props.put(Constants.SERVICE_VENDOR, context.getBundle().getHeaders().get(Constants.BUNDLE_VENDOR));
props.put(Constants.SERVICE_DESCRIPTION, PROXY_SERVICE_FACTORY_NAME);
configurator = context.registerService(ManagedServiceFactory.class.getName(), this, props);
final HttpClientBuilderConfigurator configurator = new HttpClientBuilderConfigurator(proxyConfigurations);
props.clear();
props.put(Constants.SERVICE_PID, BUILDER_FACTORY_SERVICE_PID);
props.put(Constants.SERVICE_VENDOR, context.getBundle().getHeaders().get(Constants.BUNDLE_VENDOR));
props.put(Constants.SERVICE_DESCRIPTION, BUILDER_FACTORY_SERVICE_NAME);
clientFactory = context.registerService(HttpClientBuilderFactory.class.getName(),
new OSGiHttpClientBuilderFactory(configurator, httpClientTracker),
props);
props.clear();
props.put(Constants.SERVICE_PID, CACHEABLE_BUILDER_FACTORY_SERVICE_PID);
props.put(Constants.SERVICE_VENDOR, context.getBundle().getHeaders().get(Constants.BUNDLE_VENDOR));
props.put(Constants.SERVICE_DESCRIPTION, CACHEABLE_BUILDER_FACTORY_SERVICE_NAME);
cachingClientFactory = context.registerService(CachingHttpClientBuilderFactory.class.getName(),
new OSGiCachingHttpClientBuilderFactory(configurator, httpClientTracker),
props);
}
/**
* {@inheritDoc}
*/
@Override
public void stop(final BundleContext context) throws Exception {
// unregister services
for (final ServiceRegistration registeredConfiguration : registeredConfigurations.values()) {
registeredConfiguration.unregister();
}
// remove all tracked services
registeredConfigurations.clear();
// unregister service factory
if (configurator != null) {
configurator.unregister();
}
if (clientFactory != null) {
clientFactory.unregister();
}
if (cachingClientFactory != null) {
cachingClientFactory.unregister();
}
// ensure all http clients are closed
httpClientTracker.closeAll();
}
/**
* {@inheritDoc}
*/
@Override
public String getName() {
return PROXY_SERVICE_PID;
}
/**
* {@inheritDoc}
*/
@Override
public void updated(final String pid, @SuppressWarnings("rawtypes") final Dictionary config) throws ConfigurationException {
final ServiceRegistration registration = registeredConfigurations.get(pid);
final OSGiProxyConfiguration proxyConfiguration;
if (registration == null) {
proxyConfiguration = new OSGiProxyConfiguration();
final ServiceRegistration configurationRegistration = context.registerService(ProxyConfiguration.class.getName(),
proxyConfiguration,
config);
registeredConfigurations.put(pid, configurationRegistration);
proxyConfigurations.add(proxyConfiguration);
} else {
proxyConfiguration = (OSGiProxyConfiguration) context.getService(registration.getReference());
}
@SuppressWarnings("unchecked") // data type is known
final
Dictionary properties = config;
proxyConfiguration.update(properties);
}
/**
* {@inheritDoc}
*/
@Override
public void deleted(final String pid) {
final ServiceRegistration registration = registeredConfigurations.remove(pid);
if (registration != null) {
final ServiceReference ref = registration.getReference();
final ProxyConfiguration config = (ProxyConfiguration) context.getService(ref);
proxyConfigurations.remove(config);
context.ungetService(ref);
registration.unregister();
}
}
private static void closeQuietly(final Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (final IOException e) {
// do nothing
}
}
}
static class HttpClientTracker {
private final List trackedHttpClients = new WeakList();
synchronized void track(final CloseableHttpClient client) {
trackedHttpClients.add(client);
}
synchronized void closeAll() {
for (final CloseableHttpClient client : trackedHttpClients) {
closeQuietly(client);
}
trackedHttpClients.clear();
}
}
}