Copyright 2015 Netflix, Inc.
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.
/**
 * Copyright 2015 Netflix, Inc.
 * 
 * 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.netflix.hystrix.metric;

import com.netflix.hystrix.ExecutionResult;
import com.netflix.hystrix.HystrixCommandKey;
import com.netflix.hystrix.HystrixEventType;
import com.netflix.hystrix.HystrixThreadPoolKey;
import com.netflix.hystrix.strategy.concurrency.HystrixRequestContext;

import java.util.ArrayList;
import java.util.List;

Data class which gets fed into event stream when a command completes (with any of the outcomes in HystrixEventType). /**
 * Data class which gets fed into event stream when a command completes (with any of the outcomes in {@link HystrixEventType}).
 */
public class HystrixCommandCompletion extends HystrixCommandEvent {
    protected final ExecutionResult executionResult;
    protected final HystrixRequestContext requestContext;

    private final static HystrixEventType[] ALL_EVENT_TYPES = HystrixEventType.values();

    HystrixCommandCompletion(ExecutionResult executionResult, HystrixCommandKey commandKey,
                             HystrixThreadPoolKey threadPoolKey, HystrixRequestContext requestContext) {
        super(commandKey, threadPoolKey);
        this.executionResult = executionResult;
        this.requestContext = requestContext;
    }

    public static HystrixCommandCompletion from(ExecutionResult executionResult, HystrixCommandKey commandKey, HystrixThreadPoolKey threadPoolKey) {
        return from(executionResult, commandKey, threadPoolKey, HystrixRequestContext.getContextForCurrentThread());
    }

    public static HystrixCommandCompletion from(ExecutionResult executionResult, HystrixCommandKey commandKey, HystrixThreadPoolKey threadPoolKey, HystrixRequestContext requestContext) {
        return new HystrixCommandCompletion(executionResult, commandKey, threadPoolKey, requestContext);
    }

    @Override
    public boolean isResponseThreadPoolRejected() {
        return executionResult.isResponseThreadPoolRejected();
    }

    @Override
    public boolean isExecutionStart() {
        return false;
    }

    @Override
    public boolean isExecutedInThread() {
        return executionResult.isExecutedInThread();
    }

    @Override
    public boolean isCommandCompletion() {
        return true;
    }

    public HystrixRequestContext getRequestContext() {
        return this.requestContext;
    }

    public ExecutionResult.EventCounts getEventCounts() {
        return executionResult.getEventCounts();
    }

    public long getExecutionLatency() {
        return executionResult.getExecutionLatency();
    }

    public long getTotalLatency() {
        return executionResult.getUserThreadLatency();
    }

    @Override
    public boolean didCommandExecute() {
        return executionResult.executionOccurred();
    }

    @Override
    public String toString() {
        StringBuffer sb = new StringBuffer();
        List<HystrixEventType> foundEventTypes = new ArrayList<HystrixEventType>();

        sb.append(getCommandKey().name()).append("[");
        for (HystrixEventType eventType: ALL_EVENT_TYPES) {
            if (executionResult.getEventCounts().contains(eventType)) {
                foundEventTypes.add(eventType);
            }
        }
        int i = 0;
        for (HystrixEventType eventType: foundEventTypes) {
            sb.append(eventType.name());
            int eventCount = executionResult.getEventCounts().getCount(eventType);
            if (eventCount > 1) {
                sb.append("x").append(eventCount);

            }
            if (i < foundEventTypes.size() - 1) {
                sb.append(", ");
            }
            i++;
        }
        sb.append("][").append(getExecutionLatency()).append(" ms]");
        return sb.toString();
    }
}