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The Core Camel Java DSL based router
/**
* 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.component;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.camel.Component;
import org.apache.camel.api.management.ManagedAttribute;
import org.apache.camel.api.management.ManagedOperation;
import org.apache.camel.api.management.ManagedResource;
import org.apache.camel.api.management.mbean.ManagedResourceEndpointMBean;
import org.apache.camel.converter.IOConverter;
import org.apache.camel.impl.ProcessorEndpoint;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.UriParam;
import org.apache.camel.spi.UriPath;
import org.apache.camel.util.IOHelper;
import org.apache.camel.util.ResourceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A useful base class for endpoints which depend on a resource
* such as things like Velocity or XQuery based components.
*/
@ManagedResource(description = "Managed ResourceEndpoint")
public abstract class ResourceEndpoint extends ProcessorEndpoint implements ManagedResourceEndpointMBean {
protected final Logger log = LoggerFactory.getLogger(getClass());
private volatile byte[] buffer;
@UriPath(description = "Path to the resource") @Metadata(required = "true")
private String resourceUri;
@UriParam(defaultValue = "false", description = "Sets whether to use resource content cache or not")
private boolean contentCache;
public ResourceEndpoint() {
}
public ResourceEndpoint(String endpointUri, Component component, String resourceUri) {
super(endpointUri, component);
this.resourceUri = resourceUri;
}
/**
* Gets the resource as an input stream considering the cache flag as well.
*
* If cache is enabled then the resource content is cached in an internal buffer and this content is
* returned to avoid loading the resource over and over again.
*
* @return the input stream
* @throws IOException is thrown if error loading the content of the resource to the local cache buffer
*/
public InputStream getResourceAsInputStream() throws IOException {
// try to get the resource input stream
InputStream is;
if (isContentCache()) {
synchronized (this) {
if (buffer == null) {
log.debug("Reading resource: {} into the content cache", resourceUri);
is = getResourceAsInputStreamWithoutCache();
buffer = IOConverter.toBytes(is);
IOHelper.close(is, resourceUri, log);
}
}
log.debug("Using resource: {} from the content cache", resourceUri);
return new ByteArrayInputStream(buffer);
}
return getResourceAsInputStreamWithoutCache();
}
protected InputStream getResourceAsInputStreamWithoutCache() throws IOException {
return loadResource(resourceUri);
}
/**
* Loads the given resource.
*
* @param uri uri of the resource.
* @return the loaded resource
* @throws IOException is thrown if resource is not found or cannot be loaded
*/
protected InputStream loadResource(String uri) throws IOException {
return ResourceHelper.resolveMandatoryResourceAsInputStream(getCamelContext().getClassResolver(), uri);
}
@ManagedAttribute(description = "Whether the resource is cached")
public boolean isContentCache() {
return contentCache;
}
@ManagedOperation(description = "Clears the cached resource, forcing to re-load the resource on next request")
public void clearContentCache() {
log.debug("Clearing resource: {} from the content cache", resourceUri);
buffer = null;
}
public boolean isContentCacheCleared() {
return buffer == null;
}
@ManagedAttribute(description = "Camel context ID")
public String getCamelId() {
return getCamelContext().getName();
}
@ManagedAttribute(description = "Camel ManagementName")
public String getCamelManagementName() {
return getCamelContext().getManagementName();
}
@ManagedAttribute(description = "Endpoint service state")
public String getState() {
return getStatus().name();
}
/**
* Sets whether to use resource content cache or not.
*/
public void setContentCache(boolean contentCache) {
this.contentCache = contentCache;
}
public String getResourceUri() {
return resourceUri;
}
/**
* Path to the resource
*
* @param resourceUri the resource path
*/
public void setResourceUri(String resourceUri) {
this.resourceUri = resourceUri;
}
}