package org.infinispan.factories.components;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import org.infinispan.commons.CacheException;
import org.infinispan.commons.util.FileLookup;
import org.infinispan.factories.annotations.DefaultFactoryFor;
/**
* This is a repository of component metadata, which is populated when the Infinispan core jar is loaded up. Actual
* metadata is analyzed and persisted into the jar at build-time, taking it off the critical path.
*
* @author Manik Surtani
* @since 5.1
* @see ComponentMetadata
*/
public class ComponentMetadataRepo {
final Map<String, ComponentMetadata> componentMetadataMap = new HashMap<String, ComponentMetadata>(128);
final Map<String, String> factories = new HashMap<String, String>(16);
private final ComponentMetadata dependencyFreeComponent = new ComponentMetadata();
@SuppressWarnings("unchecked")
public synchronized void readMetadata(URL metadataFile) throws IOException, ClassNotFoundException {
Map<String, ComponentMetadata> comp;
Map<String, String> fact;
InputStream inputStream = metadataFile.openStream();
try {
BufferedInputStream bis = new BufferedInputStream(inputStream);
try {
ObjectInputStream ois = new ObjectInputStream(bis);
try {
comp = (Map<String, ComponentMetadata>) ois.readObject();
fact = (Map<String, String>) ois.readObject();
} finally {
ois.close();
}
} finally {
bis.close();
}
} finally {
inputStream.close();
}
componentMetadataMap.putAll(comp);
factories.putAll(fact);
}
/**
* Locates metadata for a given component type if registered. If not registered, superclasses/interfaces are
* consulted, until, finally, an empty instance of {@link ComponentMetadata} is returned effectively declaring
* that the component has no dependencies or any lifecycle methods declared.
*
* @param componentType component type to look for
* @return metadata expressed as a ComponentMetadata instance
*/
public ComponentMetadata findComponentMetadata(Class<?> componentType) {
ComponentMetadata md = null;
while (md == null) {
String componentName = componentType.getName();
md = componentMetadataMap.get(componentName);
if (md == null) {
// Test superclasses/superinterfaces.
if (!componentType.equals(Object.class) && !componentType.isInterface())
componentType = componentType.getSuperclass();
else
md = dependencyFreeComponent;
}
}
return md;
}
/**
* Locates metadata for a given component type if registered. If not registered, a null is returned.
*
* @param componentName name of component type to look for
* @return metadata expressed as a ComponentMetadata instance, or null
*/
public ComponentMetadata findComponentMetadata(String componentName) {
return componentMetadataMap.get(componentName);
}
/**
* Locates the fully qualified class name of a factory capable of constructing an instance of <pre>componentType</pre>.
* Typically this is a factory annotated with {@link DefaultFactoryFor}.
* @param componentType component to create
* @return a factory, or null if not found.
*/
public String findFactoryForComponent(Class<?> componentType) {
return factories.get(componentType.getName());
}
/**
* Initializes this repository. The Iterable passed in should contain all {@link ModuleMetadataFileFinder} instances
* for all loaded Infinispan modules. Note that the core module is always loaded and need not be contained in this
* iterable.
* @param moduleMetadataFiles file finders to iterate through and load into the repository
*/
public void initialize(Iterable<ModuleMetadataFileFinder> moduleMetadataFiles, ClassLoader cl) {
// First init core module metadata
try {
readMetadata(new FileLookup().lookupFileLocation("infinispan-core-component-metadata.dat", cl));
} catch (Exception e) {
throw new CacheException("Unable to load component metadata!", e);
}
// Now the modules
for (ModuleMetadataFileFinder finder: moduleMetadataFiles) {
try {
readMetadata(new FileLookup().lookupFileLocation(finder.getMetadataFilename(), cl));
} catch (Exception e) {
throw new CacheException("Unable to load component metadata in file " + finder.getMetadataFilename(), e);
}
}
}
/**
* Inject a factory for a given component type.
*
* @param componentType Component type that the factory will produce
* @param factoryType Factory that produces the given type of components
*/
public void injectFactoryForComponent(Class<?> componentType, Class<?> factoryType) {
factories.put(componentType.getName(), factoryType.getName());
}
}