odecomponent.java

来自「bpel执行引擎用来执行bpel业务流程」· Java 代码 · 共 121 行

/*
 * 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.ode.jbi;

import javax.jbi.component.Component;
import javax.jbi.component.ComponentLifeCycle;
import javax.jbi.component.ServiceUnitManager;
import javax.jbi.messaging.MessageExchange;
import javax.jbi.servicedesc.ServiceEndpoint;

import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;

/**
 * This class implements {@link javax.jbi.component.Component} interface.
 */
public class OdeComponent implements Component {
	private OdeLifeCycle _lifeCycle;

	public OdeComponent() {
		_lifeCycle = new OdeLifeCycle();
	}

	public ComponentLifeCycle getLifeCycle() {
		return _lifeCycle;
	}

	public ServiceUnitManager getServiceUnitManager() {
		return _lifeCycle.getSUManager();
	}

	/**
	 * 
     * @param ref ServiceEndpoint object
	 * 
     * @return Descriptor Object implementing
     *         {@link javax.jbi.servicedesc.Descriptor} interface.
	 */
	public Document getServiceDescription(ServiceEndpoint ref) {
		return  _lifeCycle.getOdeContext().getServiceDescription(ref.getServiceName());
	}

	/**
	 * This method is called by JBI to check if this component, in the role of
	 * provider of the service indicated by the given exchange, can actually
	 * perform the operation desired. The consumer is described by the given
	 * capabilities, and JBI has already ensured that a fit exists between the set
	 * of required capabilities of the provider and the available capabilities of
	 * the consumer, and vice versa. This matching consists of simple set matching
	 * based on capability names only. <br>
	 * <br>
	 * Note that JBI assures matches on capability names only; it is the
	 * responsibility of this method to examine capability values to ensure a
	 * match with the consumer.
	 * 
	 * @param endpoint
	 *          the endpoint to be used by the consumer
	 * @param exchange
	 *          the proposed message exchange to be performed
	 * @return true if this provider component can perform the the given exchange
	 *         with the described consumer
	 */
	public boolean isExchangeWithConsumerOkay(ServiceEndpoint endpoint, MessageExchange exchange) {
		return true;
	}

	/**
	 * This method is called by JBI to check if this component, in the role of
	 * consumer of the service indicated by the given exchange, can actually
	 * interact with the the provider completely. Ths provider is described by the
	 * given capabilities, and JBI has already ensure that a fit exists between
	 * the set of required capabilities of the consumer and the available
	 * capabilities of the provider, and vice versa. This matching consists of
	 * simple set matching based on capability names only. <br>
	 * <br>
	 * Note that JBI assures matches on capability names only; it is the
	 * responsibility of this method to examine capability values to ensure a
	 * match with the provider.
	 * 
	 * @param exchange
	 *          the proposed message exchange to be performed
     * @return true if this consumer component can interact with the described
	 *         provider to perform the given exchange
	 */
	public boolean isExchangeWithProviderOkay(ServiceEndpoint endpoint, MessageExchange exchange) {
		return true;
	}

	/**
	 * Resolve the given endpoint reference, given the capabilities of the given
	 * consumer. This is called by JBI when it is attempting to resolve the given
	 * endpoint reference on behalf of a component.
	 * 
	 * @param epr
	 *          the endpoint reference, in some XML dialect understood by the
	 *          appropriate component (usually a Binding Component).
	 * @return the service endpoint for the endpoint reference; <code>null</code>
	 *         if the endpoint reference cannot be resolved.
	 */
	public ServiceEndpoint resolveEndpointReference(DocumentFragment epr) {
    // We are an engine, so we don't have to worry about this.
		return null;
	}
}