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package com.keuin.kbackupfabric.operation.abstracts;
/**
* A basic async operation, but not invokable.
* If you want an invokable interface (InvokableOperation), use InvokableAsyncOperation instead.
*/
public abstract class AbstractAsyncOperation extends AbstractSerialOperation {
private final Thread thread;
private final String name;
private final Object sync = new Object();
protected AbstractAsyncOperation(String name) {
this.name = name;
this.thread = new Thread(this::async, name);
}
/**
* Start the worker thread.
*
* @return true if succeed starting, false if this operation is already started, or the sync method failed.
*/
@Override
protected final boolean operate() {
synchronized (sync) {
if (thread.isAlive())
return false;
if (!sync())
return false;
thread.start();
return true;
}
}
/**
* Implement your async operation here.
* After starting the operation, this method will be run in another thread after the sync method returns.
* When this method returns, the operation must have been finished.
*/
protected abstract void async();
/**
* If necessary, implement your sync operations here.
* It will be invoked before starting the async thread.
* If this method failed, the async method will not be invoked.
* @return whether this method succeed.
*/
protected boolean sync() {
return true;
}
public final String getName() {
return name;
}
@Override
public String toString() {
return "operation " + name;
}
}
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