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package org.onap.sdc.dcae.catalog.commons;
import java.util.List;
import java.util.LinkedList;
import java.util.ArrayList;
import java.util.Collections;
import java.util.concurrent.CountDownLatch;
import org.onap.sdc.common.onaplog.OnapLoggerDebug;
import org.onap.sdc.common.onaplog.OnapLoggerError;
import org.onap.sdc.common.onaplog.Enums.LogLevel;
import org.onap.sdc.dcae.catalog.commons.Action;
import org.onap.sdc.dcae.catalog.commons.Future;
import org.onap.sdc.dcae.catalog.commons.FutureHandler;
import org.onap.sdc.dcae.catalog.commons.Futures;
/**
*/
public interface Actions {
/** */
public static interface CompoundAction<T> extends Action<List<T>> {
public CompoundAction<T> addAction(Action<T> theAction);
public List<Action<T>> actions();
public Future<List<T>> execute();
}
public static class BasicCompoundAction<T> implements CompoundAction<T> {
private LinkedList<Action<T>> actions = new LinkedList<Action<T>>();
public CompoundAction<T> addAction(Action<T> theAction) {
this.actions.add(theAction);
return this;
}
public List<Action<T>> actions() {
return this.actions;
}
public Future<List<T>> execute() {
CompoundFuture<T> cf = new CompoundFuture<T>(this.actions.size());
for (Action a: this.actions)
cf.addFuture(a.execute());
return cf;
}
}
public static class CompoundFuture<T> extends Futures.BasicFuture<List<T>> {
private static OnapLoggerError errLogger = OnapLoggerError.getInstance();
private static OnapLoggerDebug debugLogger = OnapLoggerDebug.getInstance();
private LinkedList<Future<T>> futures = new LinkedList<Future<T>>();
private FutureHandler<T> hnd;
CompoundFuture(int theActionCount) {
hnd = new Futures.BasicHandler<T>(new CountDownLatch(theActionCount)) {
private List<T> results = new ArrayList<T>(Collections.nCopies(theActionCount, null));
protected void process(Future<T> theResult) {
synchronized(CompoundFuture.this) {
if (theResult.failed()) {
CompoundFuture.this.cause(theResult.cause());
//and stop processing of other results
this.results = null;
//??
}
else {
if (this.results != null)
this.results.set(futures.indexOf(theResult), theResult.result());
debugLogger.log(LogLevel.DEBUG, this.getClass().getName(), "Got result for action {}. Count at {}", futures.indexOf(theResult), this.latch.getCount());
}
if (this.latch.getCount() == 1) {//this was the last result
debugLogger.log(LogLevel.DEBUG, this.getClass().getName(), "Got all results: {}", this.results);
CompoundFuture.this.result(this.results);
}
}
}
};
}
CompoundFuture<T> addFuture(Future<T> theFuture) {
synchronized(this) {
futures.add(theFuture);
theFuture.setHandler(this.hnd);
}
return this;
}
}
/*
public static class CompoundFutureHandler<T> implements FutureHandler<T> {
protected List<T> result = null;
protected List<Throwable> error = null;
protected CountDownLatch latch = null;
CompoundFutureHandler(int theResultCount) {
this(new CountDownLatch(theResultCount));
}
public void handle(Future<T> theResult) {
if (this.latch != null) {
this.latch.countDown();
}
}
public T result()
throws InterruptedException, RuntimeException {
return result(true);
}
public BasicHandler<T> waitForCompletion() throws InterruptedException {
this.latch.await();
return this;
}
}
*/
public static class Sequence<T> implements Action<List<T>> {
private static OnapLoggerError errLogger = OnapLoggerError.getInstance();
private static OnapLoggerDebug debugLogger = OnapLoggerDebug.getInstance();
private List<Action<T>> actions = new LinkedList<Action<T>>();
private int current = 0;
private SequenceFuture<T> future = new SequenceFuture<T>();
public Sequence<T> add(Action<T> theAction) {
if (this.current > 0)
throw new IllegalStateException("In execution");
this.actions.add(theAction);
return this;
}
/* we allow 'early' access to the future so that a client can pass its reference while
* it still builds the sequence, for example.
*/
public Future<List<T>> future() {
return this.future;
}
//need to add protection when for the 'no action' case
public Future<List<T>> execute() {
debugLogger.log(LogLevel.DEBUG, this.getClass().getName(), "Starting serialized execution of {}", actions);
if (hasNext())
next().execute().setHandler(future.hnd);
return this.future;
}
protected boolean hasNext() {
return this.current < actions.size();
}
protected Action next() {
return actions.get(this.current++);
}
private class SequenceFuture<T> extends Futures.BasicFuture<List<T>> {
private List<T> results = new LinkedList<T>();
private FutureHandler<T> hnd = new Futures.BasicHandler<T>() {
protected void process(Future<T> theResult) {
if (theResult.failed()) {
SequenceFuture.this.cause(theResult.cause());
//and stop processing of other results
}
else {
SequenceFuture.this.results.add(theResult.result());
if (Sequence.this.hasNext()) {
Sequence.this.next().execute().setHandler(this);
}
else {
SequenceFuture.this.result(SequenceFuture.this.results);
}
}
}
};
}
}
}
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