com.adaptris.core.interceptor.InFlightWorkflowInterceptor.java Source code

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Here is the source code for com.adaptris.core.interceptor.InFlightWorkflowInterceptor.java

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/*
 * Copyright 2015 Adaptris Ltd.
 * 
 * Licensed 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 com.adaptris.core.interceptor;

import static org.apache.commons.lang.StringUtils.isEmpty;

import java.util.concurrent.atomic.AtomicInteger;

import javax.management.MalformedObjectNameException;

import com.adaptris.annotation.AdapterComponent;
import com.adaptris.annotation.ComponentProfile;
import com.adaptris.core.AdaptrisComponent;
import com.adaptris.core.AdaptrisMessage;
import com.adaptris.core.CoreException;
import com.adaptris.core.PoolingWorkflow;
import com.adaptris.core.Workflow;
import com.adaptris.core.runtime.ParentRuntimeInfoComponent;
import com.adaptris.core.runtime.RuntimeInfoComponent;
import com.adaptris.core.runtime.RuntimeInfoComponentFactory;
import com.adaptris.core.runtime.WorkflowManager;
import com.thoughtworks.xstream.annotations.XStreamAlias;

/**
 * WorkflowInterceptor implementation that exposes acts as the source for {@link MessageInFlightMBean}.
 * 
 * 
 * @config in-flight-workflow-interceptor
 * 
 */
@XStreamAlias("in-flight-workflow-interceptor")
@AdapterComponent
@ComponentProfile(summary = "Interceptor that reports on whether there are in flight messages on this workflow", tag = "interceptor")
public class InFlightWorkflowInterceptor extends WorkflowInterceptorImpl {

    public static final String UID_SUFFIX = "-InFlight";

    static {
        RuntimeInfoComponentFactory.registerComponentFactory(new JmxFactory());
    }

    private transient AtomicInteger messagesInFlight = new AtomicInteger(0);
    private transient int maxWorkers = 1;

    public InFlightWorkflowInterceptor() {
        super();
    }

    public InFlightWorkflowInterceptor(String uid) {
        this();
        setUniqueId(uid);
    }

    @Override
    public synchronized void workflowStart(AdaptrisMessage inputMsg) {
        messagesInFlight.incrementAndGet();
    }

    @Override
    public synchronized void workflowEnd(AdaptrisMessage inputMsg, AdaptrisMessage outputMsg) {
        messagesInFlight.decrementAndGet();
    }

    int messagesInFlightCount() {
        return Math.min(maxWorkers, messagesInFlight.get());
    }

    int messagesPendingCount() {
        // Pending is the message in flight - the number of workers.
        int inFlight = messagesInFlight.get();
        return Math.max(inFlight - messagesInFlightCount(), 0);
    }

    @Override
    public void init() throws CoreException {
        Workflow w = parentWorkflow();
        if (PoolingWorkflow.class.isAssignableFrom(w.getClass())) {
            maxWorkers = ((PoolingWorkflow) w).poolSize();
        }
    }

    @Override
    public void start() throws CoreException {
        messagesInFlight = new AtomicInteger(0);
    }

    @Override
    public void stop() {
    }

    @Override
    public void close() {
    }

    private static class JmxFactory extends RuntimeInfoComponentFactory {

        @Override
        protected boolean isSupported(AdaptrisComponent e) {
            if (e != null && e instanceof InFlightWorkflowInterceptor) {
                return !isEmpty(((InFlightWorkflowInterceptor) e).getUniqueId());
            }
            return false;
        }

        @Override
        protected RuntimeInfoComponent createComponent(ParentRuntimeInfoComponent parent, AdaptrisComponent e)
                throws MalformedObjectNameException {
            return new MessageInFlight((WorkflowManager) parent, (InFlightWorkflowInterceptor) e);
        }

    }

}