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Provides shell commands to manipulate OSGi services
/*
* 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.karaf.service.command;
import java.util.concurrent.TimeoutException;
import org.apache.karaf.shell.commands.Argument;
import org.apache.karaf.shell.commands.Command;
import org.apache.karaf.shell.commands.Option;
import org.apache.karaf.shell.console.OsgiCommandSupport;
import org.osgi.framework.Constants;
import org.osgi.framework.Filter;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.util.tracker.ServiceTracker;
/**
* Command that can be used to wait for an OSGi service.
*/
@Command(scope = "service", name = "wait", description = "Wait for a given OSGi service.")
public class Wait extends OsgiCommandSupport {
@Option(name = "-e", aliases = { "--exception" }, description = "throw an exception if the service is not found after the timeout")
boolean exception;
@Option(name = "-t", aliases = { "--timeout" }, description = "timeout to wait for the service (in milliseconds, negative to not wait at all, zero to wait forever)")
long timeout = 0;
@Argument(name = "service", description="The service class or filter", required = true, multiValued = false)
String service;
@Override
protected Object doExecute() throws Exception {
ServiceTracker tracker = null;
try {
String filter = service;
if (!filter.startsWith("(")) {
if (!filter.contains("=")) {
filter = Constants.OBJECTCLASS + "=" + filter;
}
filter = "(" + filter + ")";
}
Filter osgiFilter = FrameworkUtil.createFilter(filter);
tracker = new ServiceTracker(bundleContext, osgiFilter, null);
tracker.open(true);
Object svc = tracker.getService();
if (timeout >= 0) {
svc = tracker.waitForService(timeout);
}
if (exception && svc == null) {
throw new TimeoutException("Can not find service '" + service + "' in the OSGi registry");
}
return svc != null;
} catch (InvalidSyntaxException e) {
throw new IllegalArgumentException("Invalid filter", e);
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
if (tracker != null) {
tracker.close();
}
}
}
}
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